/* ==========================================
   DESIGN SYSTEM & VARIABLES
   ========================================== */
:root {
    /* Fonts */
    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'Outfit', sans-serif;

    /* Transition speeds */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Theme colors (Koyu Mod - Varsayılan) */
    --bg-primary: #080c14;
    --bg-secondary: #0f172a;
    --bg-card: rgba(15, 23, 42, 0.6);
    --border-color: rgba(255, 255, 255, 0.08);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-purple: #a855f7;
    --accent-purple-glow: rgba(168, 85, 247, 0.15);
    --accent-blue: #3b82f6;
    --accent-blue-glow: rgba(59, 130, 246, 0.15);
    --accent-gradient: linear-gradient(135deg, #a855f7 0%, #3b82f6 100%);
    --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
    --nav-bg: rgba(8, 12, 20, 0.7);
    --badge-bg: rgba(168, 85, 247, 0.1);
    --input-bg: rgba(15, 23, 42, 0.8);
}

/* Light Theme Variables */
body.light-theme {
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-card: rgba(255, 255, 255, 0.75);
    --border-color: rgba(0, 0, 0, 0.08);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --accent-purple: #7c3aed;
    --accent-purple-glow: rgba(124, 58, 237, 0.1);
    --accent-blue: #2563eb;
    --accent-blue-glow: rgba(37, 99, 235, 0.1);
    --accent-gradient: linear-gradient(135deg, #7c3aed 0%, #2563eb 100%);
    --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.06);
    --nav-bg: rgba(248, 250, 252, 0.75);
    --badge-bg: rgba(124, 58, 237, 0.08);
    --input-bg: #ffffff;
}

/* ==========================================
   BASE & RESET
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

main {
    position: relative;
    z-index: 1;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ==========================================
   GLOW BACKGROUND EFFECTS
   ========================================== */
.glow-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.glow-circle {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
    transition: opacity var(--transition-normal);
}

body.light-theme .glow-circle {
    opacity: 0.08;
}

.glow-1 {
    top: -10%;
    right: -10%;
    width: 50vw;
    height: 50vw;
    background: var(--accent-purple);
}

.glow-2 {
    bottom: -10%;
    left: -10%;
    width: 60vw;
    height: 60vw;
    background: var(--accent-blue);
}

/* ==========================================
   COMPONENTS
   ========================================== */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.8rem;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #ffffff;
    box-shadow: 0 4px 20px rgba(168, 85, 247, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(168, 85, 247, 0.5);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-outline:hover {
    background: var(--border-color);
    transform: translateY(-2px);
}

.btn-block {
    width: 100%;
}

/* Badge */
.badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background-color: var(--badge-bg);
    color: var(--accent-purple);
    border: 1px solid rgba(168, 85, 247, 0.2);
    border-radius: 50px;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 1.5rem;
}

/* Sections */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 6rem 2rem;
    position: relative;
    z-index: 2;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.sub-heading {
    display: block;
    font-family: var(--font-heading);
    color: var(--accent-blue);
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.header-line {
    width: 60px;
    height: 4px;
    background: var(--accent-gradient);
    margin: 1rem auto 0 auto;
    border-radius: 2px;
}

/* ==========================================
   NAVIGATION BAR
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background-color: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    padding: 0.6rem 0;
    box-shadow: var(--card-shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.2rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: padding var(--transition-normal);
}

.navbar.scrolled .nav-container {
    padding: 0.8rem 2rem;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
}

.logo-accent {
    color: var(--accent-purple);
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
    position: relative;
    padding: 0.2rem 0;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: width var(--transition-normal);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background-color: var(--border-color);
    color: var(--accent-purple);
}

.sun-icon {
    display: none;
    width: 20px;
    height: 20px;
}

.moon-icon {
    display: block;
    width: 18px;
    height: 18px;
}

body.light-theme .sun-icon {
    display: block;
}

body.light-theme .moon-icon {
    display: none;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 101;
}

.mobile-toggle span {
    width: 100%;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

/* ==========================================
   HERO SECTION
   ========================================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
    width: 100%;
}

.hero-content {
    max-width: 100%;
    margin: 0;
    text-align: left;
}

.hero-image-container {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1.2s cubic-bezier(0.16, 1, 0.3, 1), transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

body.loaded .hero-image-container {
    opacity: 1;
    transform: translateY(0);
}

.hero-image-wrapper {
    position: relative;
    border-radius: 30px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    background: radial-gradient(circle at center, rgba(168, 85, 247, 0.25) 0%, rgba(59, 130, 246, 0.08) 50%, transparent 80%), var(--bg-card);
    aspect-ratio: 1 / 1;
    max-width: 320px;
    width: 100%;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.hero-image-wrapper:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: rgba(168, 85, 247, 0.4);
    box-shadow: 0 30px 60px rgba(168, 85, 247, 0.2);
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    filter: grayscale(10%) contrast(102%);
}

.hero-image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, transparent 65%, rgba(11, 12, 16, 0.7) 100%);
    pointer-events: none;
}

.light-theme .hero-image-overlay {
    background: linear-gradient(to bottom, transparent 65%, rgba(255, 255, 255, 0.4) 100%);
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 4.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 650px;
}

.hero-buttons {
    display: flex;
    gap: 1.2rem;
    justify-content: flex-start;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-family: var(--font-heading);
    cursor: pointer;
}

.mouse {
    width: 25px;
    height: 40px;
    border: 2px solid var(--text-secondary);
    border-radius: 20px;
    display: flex;
    justify-content: center;
    padding-top: 6px;
}

.wheel {
    width: 4px;
    height: 8px;
    background-color: var(--accent-purple);
    border-radius: 2px;
    animation: scroll-wheel 1.5s infinite;
}

@keyframes scroll-wheel {
    0% { transform: translateY(0); opacity: 1; }
    50% { transform: translateY(6px); opacity: 0.5; }
    100% { transform: translateY(0); opacity: 1; }
}

/* ==========================================
   ABOUT SECTION
   ========================================== */
.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
}

.paragraph-lead {
    font-size: 1.3rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.about-info p {
    color: var(--text-secondary);
    margin-bottom: 1.2rem;
}

.about-stats-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.stat-box {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.stat-number {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--accent-purple);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ==========================================
   SKILLS SECTION
   ========================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.skill-category-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.skill-category-card:hover {
    transform: translateY(-5px);
    border-color: rgba(168, 85, 247, 0.3);
}

.card-icon-wrapper {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: #ffffff;
    box-shadow: 0 8px 16px -4px rgba(168, 85, 247, 0.4);
}

.card-icon {
    width: 28px;
    height: 28px;
}

.skill-category-card h3 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.skill-list {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.skill-list li {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.skill-list li::before {
    content: '';
    display: block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--accent-blue);
    box-shadow: 0 0 8px var(--accent-blue);
}

/* ==========================================
   PROJECTS SECTION
   ========================================== */
.project-filters {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-weight: 600;
    padding: 0.6rem 1.5rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover, .filter-btn.active {
    background: var(--accent-gradient);
    color: #ffffff;
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(168, 85, 247, 0.2);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 2.5rem;
}

.project-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: rgba(59, 130, 246, 0.3);
}

.project-img-wrapper {
    position: relative;
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.project-placeholder-img {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.project-placeholder-img::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, transparent 30%, rgba(0, 0, 0, 0.4) 100%);
}

.project-vector {
    width: 60px;
    height: 60px;
    color: #ffffff;
    opacity: 0.85;
    z-index: 2;
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.3));
}

/* Project Gradients */
.cbs-electric-gradient {
    background: linear-gradient(135deg, #7b2cbf 0%, #1d3557 100%);
}
.cbs-gradient {
    background: linear-gradient(135deg, #1d3557 0%, #457b9d 100%);
}
.electric-gradient {
    background: linear-gradient(135deg, #f72585 0%, #7209b7 100%);
}
.cbs-electric-gradient-2 {
    background: linear-gradient(135deg, #03045e 0%, #00b4d8 100%);
}

.project-info {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-tag {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent-blue);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.6rem;
}

.project-info h3 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.project-info p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.project-tech {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.project-tech span {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 600;
    background-color: var(--bg-secondary);
    padding: 0.3rem 0.8rem;
    border-radius: 5px;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

/* ==========================================
   CONTACT SECTION
   ========================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 4rem;
}

.contact-info-card h3 {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.contact-info-card p {
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-detail-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.detail-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-purple);
}

.detail-icon svg {
    width: 22px;
    height: 22px;
}

.detail-content {
    display: flex;
    flex-direction: column;
}

.detail-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.detail-value {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--text-primary);
}

.contact-form-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 3rem;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.form-group {
    position: relative;
    margin-bottom: 2rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem 1.2rem;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    outline: none;
    transition: all var(--transition-fast);
}

.form-group textarea {
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent-purple);
    box-shadow: 0 0 10px rgba(168, 85, 247, 0.15);
}

.form-group label {
    position: absolute;
    top: 1rem;
    left: 1.2rem;
    color: var(--text-secondary);
    pointer-events: none;
    transition: all var(--transition-fast);
}

/* Floating labels effect */
.form-group input:focus ~ label,
.form-group input:not(:placeholder-shown) ~ label,
.form-group textarea:focus ~ label,
.form-group textarea:not(:placeholder-shown) ~ label {
    top: -0.6rem;
    left: 0.8rem;
    font-size: 0.8rem;
    background-color: var(--bg-primary);
    padding: 0 0.4rem;
    color: var(--accent-purple);
    font-weight: 600;
    border-radius: 5px;
}

.form-status {
    margin-top: 1.5rem;
    font-size: 0.95rem;
    text-align: center;
    font-family: var(--font-heading);
    font-weight: 600;
    min-height: 24px;
}

.form-status.success {
    color: #10b981;
}

.form-status.error {
    color: #ef4444;
}

/* Spinner for submit button */
.loading-spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s ease infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ==========================================
   EXPERIENCE SECTION (TIMELINE)
   ========================================== */
.timeline {
    position: relative;
    border-left: 2px solid var(--border-color);
    margin-left: 10px;
    padding-left: 30px;
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.timeline-item {
    position: relative;
}

.timeline-dot {
    position: absolute;
    left: -41px;
    top: 8px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-gradient);
    border: 4px solid var(--bg-primary);
    box-shadow: 0 0 10px var(--accent-purple);
}

.timeline-date {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--accent-blue);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.timeline-content {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.timeline-content:hover {
    transform: translateY(-5px);
    border-color: rgba(59, 130, 246, 0.3);
}

.timeline-content h3 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
}

.timeline-content h4 {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.experience-bullets {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    padding-left: 0.5rem;
}

.experience-bullets li {
    position: relative;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.experience-bullets li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--accent-purple);
    box-shadow: 0 0 8px var(--accent-purple);
}

/* ==========================================
   CERTIFICATES SECTION
   ========================================== */
.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
}

.certificate-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 2.5rem;
    text-align: center;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.certificate-card:hover {
    transform: translateY(-5px);
    border-color: rgba(168, 85, 247, 0.3);
}

.cert-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem auto;
    color: #ffffff;
    box-shadow: 0 8px 16px -4px rgba(168, 85, 247, 0.4);
}

.cert-icon svg {
    width: 28px;
    height: 28px;
}

.certificate-card h3 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
    color: var(--text-primary);
}

.cert-title {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

.cert-org {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    position: relative;
    z-index: 2;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.copyright {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.designer {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--accent-blue);
}

/* ==========================================
   PRELOADER (INTRO ANIMATION)
   ========================================== */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-primary);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.8s cubic-bezier(0.77, 0, 0.175, 1), visibility 0.8s;
}

#preloader.loaded {
    opacity: 0;
    visibility: hidden;
}

.preloader-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    text-align: center;
}

.preloader-logo {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--text-primary);
    animation: logo-pulse 2s infinite ease-in-out;
}

.preloader-bar {
    width: 200px;
    height: 3px;
    background-color: var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    position: relative;
}

.preloader-progress {
    width: 0%;
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 10px;
    animation: progress-fill 1.8s cubic-bezier(0.1, 0.8, 0.1, 1) forwards;
}

.preloader-text {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 2px;
    text-transform: uppercase;
    opacity: 0;
    animation: fade-in-text 0.5s ease 0.3s forwards;
}

body.preloader-active {
    overflow: hidden;
}

/* Hero elements entrance preparation */
.hero-content {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1.2s cubic-bezier(0.16, 1, 0.3, 1), transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

body.loaded .hero-content {
    opacity: 1;
    transform: translateY(0);
}

@keyframes logo-pulse {
    0%, 100% {
        transform: scale(1);
        filter: drop-shadow(0 0 10px rgba(168, 85, 247, 0.15));
    }
    50% {
        transform: scale(1.05);
        filter: drop-shadow(0 0 25px rgba(168, 85, 247, 0.5));
    }
}

@keyframes progress-fill {
    0% { width: 0%; }
    100% { width: 100%; }
}

@keyframes fade-in-text {
    to { opacity: 1; }
}

/* ==========================================
   POWER PANEL SECTION (ELECTRICAL SIMULATOR)
   ========================================== */
.power-grid {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 3rem;
    align-items: stretch;
}

.power-control-card, .power-display-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.power-control-card {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.power-control-card h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
}

.power-control-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.switch-group {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.switch-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: rgba(0, 0, 0, 0.15);
    padding: 0.8rem 1.2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.switch-label {
    font-size: 0.95rem;
    font-weight: 500;
}

/* Custom CSS Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.switch-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ef4444;
    transition: .4s;
    border-radius: 34px;
}

.switch-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .switch-slider {
    background-color: #10b981;
}

input:checked + .switch-slider:before {
    transform: translateX(24px);
}

/* Slider styling */
.slider-group {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin-top: 1rem;
}

.slider-header {
    display: flex;
    justify-content: space-between;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.9rem;
}

.slider-label {
    font-size: 0.95rem;
    color: var(--text-primary);
}

.slider-value {
    color: var(--accent-purple);
}

.panel-slider {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 5px;
    background: var(--bg-secondary);
    outline: none;
    border: 1px solid var(--border-color);
}

.panel-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-gradient);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(168, 85, 247, 0.5);
}

.action-group {
    margin-top: auto;
}

/* Display Card styles */
.power-display-card {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.gauges-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.gauge-box {
    background-color: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.2rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.gauge-value {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-purple);
    text-shadow: 0 0 10px rgba(168, 85, 247, 0.2);
    transition: color var(--transition-fast);
}

.gauge-box:nth-child(2) .gauge-value {
    color: var(--accent-blue);
    text-shadow: 0 0 10px rgba(59, 130, 246, 0.2);
}

.gauge-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Schematic SVG styling */
.circuit-schematic {
    background-color: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    flex-grow: 1;
    overflow: hidden;
}

.status-banner {
    width: 100%;
    padding: 0.6rem;
    border-radius: 8px;
    text-align: center;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.85rem;
    letter-spacing: 1px;
    background-color: rgba(16, 185, 129, 0.1);
    color: #10b981;
    border: 1px solid rgba(16, 185, 129, 0.2);
    transition: all var(--transition-normal);
}

.status-banner.warning {
    background-color: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.2);
    animation: banner-glow 1s infinite alternate;
}

@keyframes banner-glow {
    from { box-shadow: 0 0 5px rgba(239, 68, 68, 0.1); }
    to { box-shadow: 0 0 15px rgba(239, 68, 68, 0.3); }
}

.schematic-svg {
    width: 100%;
    height: auto;
    max-height: 180px;
}

.busbar-line {
    stroke: #e2e8f0;
    stroke-width: 6;
    stroke-linecap: round;
    transition: stroke var(--transition-fast);
}

.busbar-line.active {
    stroke: #eab308;
    filter: drop-shadow(0 0 5px rgba(234, 179, 8, 0.8));
}

.feeder-line {
    stroke: var(--border-color);
    stroke-width: 4;
    transition: stroke var(--transition-fast);
}

.feeder-line.active {
    stroke: #3b82f6;
    filter: drop-shadow(0 0 3px rgba(59, 130, 246, 0.8));
}

.node-circle {
    fill: var(--text-secondary);
    transition: fill var(--transition-fast);
}

.busbar-line.active ~ .node-circle {
    fill: #eab308;
}

.breaker-rect {
    fill: #ef4444;
    stroke: none;
    cursor: pointer;
    transition: fill var(--transition-fast);
}

.breaker-rect.active {
    fill: #10b981;
}

.breaker-text {
    fill: #ffffff;
    font-family: var(--font-heading);
    font-size: 10px;
    font-weight: 800;
    text-anchor: middle;
    pointer-events: none;
}

.trans-circle, .cap-line {
    stroke: var(--text-secondary);
    stroke-width: 3;
    fill: none;
    transition: stroke var(--transition-fast);
}

.feeder-line.active ~ .trans-circle,
.feeder-line.active ~ .cap-line {
    stroke: var(--accent-purple);
}

.svg-label {
    fill: var(--text-secondary);
    font-family: var(--font-heading);
    font-size: 10px;
    font-weight: 600;
}

/* Electron flow animation */
.electron {
    fill: #eab308;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.electron.active {
    opacity: 1;
    offset-path: path("M 120 50 L 120 135");
    motion-path: path("M 120 50 L 120 135");
    animation: flow-run 1.5s infinite linear;
}

#electron-comp.active {
    fill: #10b981;
    offset-path: path("M 280 50 L 280 130");
    motion-path: path("M 280 50 L 280 130");
    animation: flow-run 1s infinite linear;
}

@keyframes flow-run {
    0% {
        offset-distance: 0%;
        motion-offset: 0%;
    }
    100% {
        offset-distance: 100%;
        motion-offset: 100%;
    }
}

/* ==========================================
   VOICE ASSISTANT WIDGET
   ========================================== */
#voice-assistant-widget {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 999;
}

.voice-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--accent-gradient);
    border: none;
    color: #ffffff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 32px rgba(168, 85, 247, 0.4);
    position: relative;
    transition: transform var(--transition-normal);
}

.voice-btn:hover {
    transform: scale(1.05);
}

.voice-btn svg {
    width: 24px;
    height: 24px;
    z-index: 2;
}

.pulse-ring {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 2px solid var(--accent-purple);
    animation: mic-pulse-ring 2s infinite ease-out;
    opacity: 0;
    z-index: 1;
}

@keyframes mic-pulse-ring {
    0% {
        transform: scale(1);
        opacity: 0.8;
    }
    100% {
        transform: scale(1.8);
        opacity: 0;
    }
}

.voice-panel {
    position: absolute;
    bottom: 80px;
    right: 0;
    width: 320px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal) cubic-bezier(0.16, 1, 0.3, 1);
}

.voice-panel.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.voice-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.8rem;
    margin-bottom: 1rem;
}

.voice-header h4 {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 700;
    color: var(--accent-blue);
}

.close-voice-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
    transition: color var(--transition-fast);
}

.close-voice-btn:hover {
    color: var(--text-primary);
}

.voice-body {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

#voice-status-text {
    font-size: 0.95rem;
    text-align: center;
    color: var(--text-primary);
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.voice-wave {
    display: none;
    align-items: center;
    justify-content: center;
    gap: 4px;
    height: 30px;
}

.voice-wave.active {
    display: flex;
}

.voice-wave span {
    display: block;
    width: 3px;
    height: 10px;
    background-color: var(--accent-purple);
    border-radius: 2px;
    animation: wave-bar 1.2s infinite ease-in-out;
}

.voice-wave span:nth-child(2) {
    animation-delay: 0.15s;
    height: 20px;
}

.voice-wave span:nth-child(3) {
    animation-delay: 0.3s;
    height: 15px;
}

.voice-wave span:nth-child(4) {
    animation-delay: 0.45s;
    height: 8px;
}

@keyframes wave-bar {
    0%, 100% {
        transform: scaleY(1);
    }
    50% {
        transform: scaleY(2);
    }
}

.voice-hints {
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
    width: 100%;
}

.voice-hints span {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent-purple);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
    display: block;
}

.voice-hints ul {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.voice-hints li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1rem;
}

.voice-hints li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-blue);
}

/* ==========================================
   SDR RADIO SECTION (AMATEUR RADIO SDR SIMULATOR)
   ========================================== */
.sdr-radio-section {
    padding: 8rem 0;
    position: relative;
    z-index: 2;
}

.sdr-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
    align-items: stretch;
}

.sdr-waterfall-card, .sdr-control-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.waterfall-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.waterfall-title {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.1rem;
}

.active-signals-badge {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 700;
    background: var(--accent-gradient);
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    color: #ffffff;
    box-shadow: 0 4px 10px rgba(168, 85, 247, 0.2);
}

.canvas-container {
    flex-grow: 1;
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    min-height: 380px;
    background-color: #0b0c10;
}

#sdr-waterfall {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
}

/* SDR Controls Styles */
.sdr-top-display {
    display: flex;
    gap: 1.5rem;
    align-items: stretch;
}

.sdr-s-meter-box {
    flex: 1;
    background-color: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 0.8rem 1.2rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
}

.meter-label {
    font-family: var(--font-heading);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}

.s-meter-dial {
    width: 100%;
    height: 30px;
    position: relative;
    border-bottom: 1px solid var(--border-color);
    overflow: hidden;
    margin: 0.5rem 0;
}

.s-meter-needle {
    position: absolute;
    bottom: -5px;
    left: 50%;
    width: 2px;
    height: 32px;
    background-color: #ef4444;
    transform-origin: bottom center;
    transform: rotate(-60deg); /* -60deg (no signal) to +60deg (strong signal) */
    transition: transform 0.15s cubic-bezier(0.25, 0.8, 0.25, 1);
    box-shadow: 0 0 5px rgba(239, 68, 68, 0.8);
}

.s-meter-scale {
    font-family: var(--font-heading);
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.sdr-frequency-display {
    background-color: #050505;
    border: 1px solid #1a1a1a;
    border-radius: 16px;
    padding: 0.8rem 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-end;
    min-width: 180px;
    position: relative;
    box-shadow: inset 0 0 15px rgba(0, 0, 0, 0.9);
}

.led-mode-label {
    position: absolute;
    top: 0.6rem;
    left: 1rem;
    font-family: var(--font-heading);
    font-size: 0.65rem;
    font-weight: 700;
    color: #a855f7;
    opacity: 0.8;
}

.led-digits {
    font-family: 'Courier New', Courier, monospace;
    font-size: 2.2rem;
    font-weight: 700;
    color: #39ff14; /* Default green glow */
    text-shadow: 0 0 10px rgba(57, 255, 20, 0.6), 0 0 20px rgba(57, 255, 20, 0.3);
    letter-spacing: 1px;
    transition: color 0.3s, text-shadow 0.3s;
}

.sdr-frequency-display.off .led-digits {
    color: #1a231a !important;
    text-shadow: none !important;
}

.sdr-frequency-display.off .led-mode-label {
    color: #2a1a3a !important;
}

.led-unit {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-top: -0.2rem;
}

.sdr-modes-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.btn-group {
    display: flex;
    gap: 0.5rem;
}

.sdr-btn {
    background-color: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.sdr-btn.btn-small {
    padding: 0.4rem 1rem;
    border-radius: 8px;
    font-size: 0.85rem;
}

.sdr-btn.btn-small:hover, .sdr-btn.btn-small.active {
    background-color: var(--accent-purple);
    color: #ffffff;
    border-color: transparent;
    box-shadow: 0 4px 10px rgba(168, 85, 247, 0.25);
}

.sdr-power-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.2rem;
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: 700;
}

.sdr-power-btn.active {
    background-color: #ef4444;
    color: white;
    border-color: transparent;
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.4);
}

.sdr-power-btn.active:hover {
    background-color: #dc2626;
}

.sdr-sliders {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    background-color: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
}

.slider-hdr {
    display: flex;
    justify-content: space-between;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.slider-hdr span:last-child {
    color: var(--accent-purple);
}

.sdr-tuning-area {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.flex-grow {
    flex-grow: 1;
}

.dial-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.sdr-dial-outer {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, #2a2b30 0%, #151619 80%);
    border: 4px solid var(--border-color);
    position: relative;
    cursor: pointer;
    box-shadow: var(--card-shadow), inset 0 2px 4px rgba(255,255,255,0.1);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.sdr-dial-outer:hover {
    border-color: var(--accent-purple);
    box-shadow: 0 0 15px rgba(168, 85, 247, 0.25);
}

.sdr-dial-notch {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--accent-blue);
    border: 1px solid rgba(0, 0, 0, 0.5);
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    box-shadow: 0 0 8px var(--accent-blue);
}

.dial-subtext {
    font-family: var(--font-heading);
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.sdr-info-box {
    background-color: rgba(168, 85, 247, 0.05);
    border-left: 4px solid var(--accent-purple);
    border-radius: 8px;
    padding: 1.2rem;
}

.sdr-info-box h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.05rem;
    margin-bottom: 0.3rem;
    color: var(--text-primary);
}

.sdr-info-box p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* ==========================================
   3D PRINTER SECTION (MAKER SIMULATOR)
   ========================================== */
.maker-printer-section {
    padding: 8rem 0;
    position: relative;
    z-index: 2;
}

.printer-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
    align-items: stretch;
}

.printer-visual-card, .printer-control-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.visual-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.visual-title {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.1rem;
}

.led-dot {
    font-family: var(--font-heading);
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    padding: 0.25rem 0.8rem;
    border-radius: 50px;
    background-color: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
    border: 1px solid rgba(245, 158, 11, 0.3);
    transition: all var(--transition-fast);
}

.led-dot.printing {
    background-color: rgba(168, 85, 247, 0.15);
    color: #a855f7;
    border-color: rgba(168, 85, 247, 0.3);
    animation: status-pulse 1.5s infinite ease-in-out;
}

.led-dot.success {
    background-color: rgba(16, 185, 129, 0.15);
    color: #10b981;
    border-color: rgba(16, 185, 129, 0.3);
}

.led-dot.error {
    background-color: rgba(239, 68, 68, 0.15);
    color: #ef4444;
    border-color: rgba(239, 68, 68, 0.3);
}

@keyframes status-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.printer-viewport {
    background-color: #0b0c10;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 380px;
}

.printer-svg {
    width: 100%;
    height: auto;
    max-height: 360px;
}

/* Mechanical SVG Styles */
.printer-frame {
    fill: none;
    stroke: rgba(255, 255, 255, 0.05);
    stroke-width: 4;
}

.printer-frame-bold {
    stroke: rgba(255, 255, 255, 0.15);
    stroke-width: 6;
    stroke-linecap: round;
}

.z-axis-rod {
    stroke: rgba(255, 255, 255, 0.2);
    stroke-width: 3;
    stroke-dasharray: 2 10;
}

.gantry-bar {
    stroke: rgba(255, 255, 255, 0.3);
    stroke-width: 5;
    stroke-linecap: round;
}

.filament-spool {
    fill: #222;
    stroke: #444;
    stroke-width: 2;
}

.filament-spool-spoke {
    fill: #111;
}

.filament-thread {
    fill: none;
    stroke: #a855f7; /* default filament color */
    stroke-width: 1.5;
    transition: stroke 0.3s;
}

.extruder-body {
    fill: #1c1d22;
    stroke: #333;
    stroke-width: 2;
}

.extruder-fan {
    fill: #25262c;
    stroke: #444;
    stroke-width: 1;
}

.extruder-fan.active {
    animation: fan-spin 0.2s linear infinite;
    transform-box: fill-box;
    transform-origin: center;
}

@keyframes fan-spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.nozzle-tip {
    fill: #e5c158;
}

.nozzle-tip.glowing {
    fill: #ff6b6b;
    filter: drop-shadow(0 0 4px #ff6b6b);
}

.extruder-filament-guide {
    fill: none;
    stroke: #a855f7;
    stroke-width: 2;
    transition: stroke 0.3s;
}

.bed-plate {
    fill: #1f2025;
    stroke: #3c3d42;
    stroke-width: 2;
}

.bed-under-plate {
    fill: #151619;
}

.bed-border {
    stroke: #3c3d42;
    stroke-width: 2;
}

.nozzle-sparkle {
    fill: #ffb84d;
    opacity: 0;
    filter: drop-shadow(0 0 6px #ffb84d);
    transition: opacity 0.15s;
}

.nozzle-sparkle.active {
    opacity: 0.95;
    animation: sparkle-blink 0.1s infinite alternate;
}

@keyframes sparkle-blink {
    to { opacity: 0.35; }
}

/* Level Knobs */
.level-knob {
    fill: #ef4444; /* red when uncalibrated */
    stroke: #1a1a1a;
    stroke-width: 1.5;
    cursor: pointer;
    transition: fill 0.3s, filter 0.3s;
}

.level-knob.ok {
    fill: #10b981; /* green when calibrated */
    filter: drop-shadow(0 0 4px #10b981);
}

/* Printer Controls CSS */
.printer-control-group {
    background-color: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.control-group-title {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.leveling-status-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.8rem;
}

.level-btn {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.8rem;
    padding: 0.6rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.level-btn:hover {
    border-color: var(--accent-purple);
    color: var(--text-primary);
}

.level-btn .lbl-status {
    font-size: 0.75rem;
    font-weight: 700;
    color: #ef4444;
}

.level-btn.calibrated .lbl-status {
    color: #10b981;
}

.filament-row, .print-row {
    display: flex;
    gap: 1rem;
}

.printer-select {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.9rem;
    padding: 0.6rem 1rem;
    border-radius: 10px;
    outline: none;
    cursor: pointer;
    flex-grow: 1;
}

.filament-load-bar, .print-progress-bar {
    width: 100%;
    height: 4px;
    background-color: var(--bg-secondary);
    border-radius: 5px;
    overflow: hidden;
    margin-top: 0.3rem;
}

.filament-load-progress, .print-progress-fill {
    width: 0%;
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 5px;
    transition: width 0.15s ease-out;
}

.printer-status-box {
    border-radius: 12px;
    padding: 1rem;
    font-size: 0.9rem;
    line-height: 1.4;
    border: 1px solid transparent;
}

.printer-status-box.success {
    background-color: rgba(16, 185, 129, 0.05);
    border-color: rgba(16, 185, 129, 0.2);
    color: #10b981;
}

.printer-status-box.error {
    background-color: rgba(239, 68, 68, 0.05);
    border-color: rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

.printer-status-box.printing {
    background-color: rgba(168, 85, 247, 0.05);
    border-color: rgba(168, 85, 247, 0.2);
    color: #a855f7;
}

/* ==========================================
   RESPONSIVE STYLES
   ========================================== */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .hero-content {
        text-align: center;
        margin: 0 auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-image-container {
        order: -1;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .power-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .sdr-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .printer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    /* Fonts scale down */
    html {
        font-size: 15px;
    }
    
    .hero-title {
        font-size: 3.2rem;
    }
    
    .hero-subtitle {
        font-size: 1.6rem;
    }
    
    /* Navigation drawer */
    .mobile-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background-color: var(--bg-secondary);
        box-shadow: -10px 0 30px rgba(0,0,0,0.2);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2.5rem;
        z-index: 100;
        transition: right var(--transition-normal);
        backdrop-filter: blur(10px);
    }
    
    .nav-menu.open {
        right: 0;
    }
    
    /* Hamburger Icon transition to X */
    .mobile-toggle.open span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 6px);
    }
    
    .mobile-toggle.open span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-toggle.open span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -6px);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
        max-width: 300px;
        margin: 0 auto;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .timeline {
        margin-left: 5px;
        padding-left: 20px;
        gap: 2rem;
    }
    
    .timeline-dot {
        left: -31px;
        width: 16px;
        height: 16px;
        top: 10px;
    }
}