:root {
    /* Modern Blue palette for Hedef Oku (Synced with App) */
    --brand-50: #eff6ff;
    --brand-100: #dbeafe;
    --brand-200: #bfdbfe;
    --brand-300: #93c5fd;
    --brand-400: #60a5fa;
    --brand-500: #3b82f6;
    --brand-600: #2563eb;
    --brand-700: #1d4ed8;

    --primary: var(--brand-500);
    --primary-dark: var(--brand-600);
    --primary-light: var(--brand-50);
    
    --success: #10b981;
    --accent: #f59e0b;
    --danger: #ef4444;

    /* Neutrals & Surfaces from App */
    --bg: #f8fafc;
    --surface: #ffffff;
    --surface-2: rgba(15, 23, 42, 0.03);
    --text: #0f172a;
    --muted: rgba(15, 23, 42, 0.64);
    --border: rgba(15, 23, 42, 0.12);

    /* Legacy names for backward compatibility during cleanup */
    --bg-body: var(--bg);
    --bg-surface: var(--surface);
    --text-main: var(--text);
    --text-light: var(--muted);
    --border-color: var(--border);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* UI Elements */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 14px 40px rgba(15, 23, 42, 0.12);
    --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.15);

    --accent-50: #fffbeb;
    --accent-100: #fef3c7;
    --accent-500: #f59e0b;
    --accent-600: #d97706;

    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
}

h1, h2, h3, h4, .brand-logo {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
}

button {
    cursor: pointer;
    border: none;
    font-family: inherit;
}

/* Container */
.container {
    width: 92%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* Sections — single source of truth; overflow clips reveal jitter */
.section {
    padding: clamp(4rem, 10vw, 8rem) 0;
    position: relative;
    overflow-x: clip;
    overflow-y: visible;
}

/* Layout Grids - Mobile First */
.two-col-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    align-items: center;
}

.exercises-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
}

/* Exercises Section Optimization */
.section-exercises {
    background: var(--bg);
    overflow: visible !important; /* Allow 3D transforms to peek out */
    z-index: 1;
}

.bento-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    margin-top: 3rem;
}

@media (min-width: 1024px) {
    .bento-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
        perspective: 2000px;
    }
}

.bento-panel {
    display: flex;
    flex-direction: column;
    padding: 2.5rem 2rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    background: var(--surface);
    box-shadow: 0 4px 20px rgba(15, 23, 42, 0.05);
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    transform-style: preserve-3d;
    height: 100%;
}

.bento-panel:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 36px rgba(15, 23, 42, 0.08);
    border-color: var(--brand-300);
}

.bento-panel--speed { border-top: 4px solid var(--brand-500); }
.bento-panel--focus { border-top: 4px solid var(--success); }
.bento-panel--comp { border-top: 4px solid var(--accent); }

.bento-panel-head {
    margin-bottom: 2rem;
}

.bento-panel-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    flex: 1;
}

/* Hero Card inside Bento - Lab look */
.exercise-card--hero {
    background: var(--brand-50);
    border: 1px solid rgba(59, 130, 246, 0.1);
    border-radius: var(--radius-lg);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: relative;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}

.exercise-card--hero .card-body {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.exercise-card--hero h3 {
    font-size: 1.4rem;
    color: var(--text);
    margin: 0;
}

.exercise-card--hero p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--muted);
}

.exercise-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--brand-50);
    color: var(--brand-700);
    font-size: 0.7rem;
    font-weight: 700;
    border-radius: 99px;
    margin-top: 0.25rem;
    border: 1px solid var(--brand-100);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    width: fit-content;
}

/* Sub-cards Grid - Improved responsiveness */
.bento-panel-subs {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.exercise-card--sub {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    text-align: left;
    font: inherit;
    color: inherit;
    cursor: pointer;
    transition: border-color 0.3s ease, background 0.3s ease, transform 0.3s ease;
    -webkit-tap-highlight-color: transparent;
}

.exercise-card--sub:hover {
    border-color: var(--brand-400);
    background: var(--brand-50);
    transform: translateY(-2px);
}

.exercise-card--sub:focus-visible {
    outline: 2px solid var(--brand-500);
    outline-offset: 2px;
}

.exercise-card--sub-row {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    width: 100%;
}

.exercise-card--sub-main {
    flex: 1 1 auto;
    min-width: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
}

.exercise-card--sub-title {
    font-size: 1rem;
    margin: 0;
    font-weight: 600;
    color: var(--text);
}

.exercise-card--sub-chevron {
    flex-shrink: 0;
    margin-left: auto;
    color: var(--muted);
    display: flex;
    align-items: center;
    transition: transform 0.3s ease;
}

.exercise-card--sub[aria-expanded="true"] .exercise-card--sub-chevron {
    transform: rotate(180deg);
}

.exercise-card--sub-chevron-icon {
    display: block;
}

/* max-height accordion: grid 0fr/1fr fails inside flex (min-height:auto blocks collapse) */
.exercise-card--sub-detail {
    flex: 0 0 auto;
    min-height: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.exercise-card--sub[aria-expanded="true"] .exercise-card--sub-detail {
    max-height: 18rem;
}

.exercise-card--sub-detail-inner {
    display: block;
    font-size: 0.9rem;
    line-height: 1.55;
    color: var(--muted);
}

.exercise-card--sub[aria-expanded="true"] .exercise-card--sub-detail-inner {
    padding-top: 0.75rem;
    margin-top: 0.75rem;
    border-top: 1px solid var(--border);
}

@media (prefers-reduced-motion: reduce) {
    .exercise-card--sub-detail {
        transition: none;
    }
    .exercise-card--sub-chevron {
        transition: none;
    }
}

.exercise-card--sub .icon {
    width: 36px;
    height: 36px;
    color: var(--brand-600);
    flex-shrink: 0;
    opacity: 0.8;
}

/* Lab visualizations — metaphors: rhythm (WPM), scan (focus), left→right flow (comprehension) */
.lab-visualization {
    height: 80px;
    background: white;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(0, 0, 0, 0.06);
    margin: 0.5rem 0;
}

/* Speed: vertical “meter” bars — scale only, bottom-anchored (reading rhythm) */
.lab-visualization--speed .bar-container {
    display: flex;
    gap: 8px;
    align-items: flex-end;
    height: 36px;
}

.lab-visualization--speed .bar {
    width: 6px;
    height: 32px;
    background: var(--brand-500);
    border-radius: 3px;
    transform-origin: bottom center;
    animation: wpm-meter 1.2s ease-in-out infinite;
}

.lab-visualization--speed .bar:nth-child(1) { animation-delay: 0s; }
.lab-visualization--speed .bar:nth-child(2) { animation-delay: 0.15s; }
.lab-visualization--speed .bar:nth-child(3) { animation-delay: 0.3s; }

@keyframes wpm-meter {
    0%, 100% { transform: scaleY(0.28); opacity: 0.55; }
    50% { transform: scaleY(1); opacity: 1; }
}

/* Focus: sweep originates from disc center (radar metaphor) */
.lab-visualization--focus .radar-scene {
    position: relative;
    width: 56px;
    height: 56px;
}

.lab-visualization--focus .radar-circle {
    position: absolute;
    inset: 0;
    border: 2px solid rgba(16, 185, 129, 0.35);
    border-radius: 50%;
    background: radial-gradient(circle at center, rgba(16, 185, 129, 0.06) 0%, transparent 70%);
}

.lab-visualization--focus .radar-sweep {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 50%;
    height: 2px;
    margin-top: -1px;
    transform-origin: 0 50%;
    background: linear-gradient(90deg, rgba(16, 185, 129, 0.95), rgba(16, 185, 129, 0));
    border-radius: 1px;
    animation: radar-sweep 2.4s linear infinite;
}

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

/* Comprehension: path draws left→right; dots reinforce “sequence” */
.lab-visualization--comp {
    color: var(--accent-600);
}

.lab-visualization--comp .comp-flow-svg {
    display: block;
}

.lab-visualization--comp .comp-path {
    stroke: currentColor;
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
    animation: comp-path-draw 2.5s ease-in-out infinite;
}

.lab-visualization--comp .comp-dot {
    fill: currentColor;
    animation: comp-dot-seq 2.5s ease-in-out infinite;
}

.lab-visualization--comp .comp-dot:nth-child(2) { animation-delay: 0s; }
.lab-visualization--comp .comp-dot:nth-child(3) { animation-delay: 0.35s; }
.lab-visualization--comp .comp-dot:nth-child(4) { animation-delay: 0.7s; }

@keyframes comp-path-draw {
    0% { stroke-dashoffset: 100; opacity: 0.5; }
    35% { stroke-dashoffset: 0; opacity: 1; }
    70% { stroke-dashoffset: 0; opacity: 1; }
    100% { stroke-dashoffset: 100; opacity: 0.5; }
}

@keyframes comp-dot-seq {
    0%, 100% { opacity: 0.35; }
    20%, 60% { opacity: 1; }
}

/* Responsive Adjustments for Bento */
@media (max-width: 640px) {
    .bento-panel-subs {
        grid-template-columns: 1fr;
    }
    .exercise-card--sub-row {
        align-items: flex-start;
    }
    .exercise-card--sub-title {
        font-size: 0.9rem;
    }
}

@media (min-width: 768px) {
    .two-col-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-xl);
    }
}

/* Steps Section */
.steps-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    position: relative;
    margin-top: 3rem;
}

@media (min-width: 768px) {
    .steps-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .steps-grid::before {
        content: '';
        position: absolute;
        top: 32px;
        left: 10%;
        width: 80%;
        height: 2px;
        background: linear-gradient(90deg, transparent, var(--brand-200), transparent);
        z-index: 0;
    }
}

.step-item {
    text-align: center;
    position: relative;
    z-index: 1;
}

.step-number {
    width: 64px;
    height: 64px;
    background: var(--surface);
    border: 2px solid var(--brand-500);
    color: var(--brand-600);
    font-weight: 800;
    font-size: 1.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.step-item:hover .step-number {
    transform: scale(1.1);
    background: var(--brand-500);
    color: white;
    box-shadow: 0 0 20px rgba(37, 99, 235, 0.3);
}

.step-item h3 { margin-bottom: 0.75rem; font-size: 1.25rem; }
.step-item p { color: var(--muted); font-size: 0.95rem; }

/* User Roles Section */
.section-roles {
    background: var(--surface);
    position: relative;
    z-index: 2;
    border-top: 1px solid var(--border);
}

.roles-wrapper {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-md);
}

@media (min-width: 992px) {
    .roles-wrapper { flex-direction: row; }
}

.role-side {
    flex: 1;
    padding: clamp(2.5rem, 5vw, 4rem);
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease;
}

.role-side.students {
    background: linear-gradient(135deg, #ffffff 0%, var(--brand-50) 100%);
    border-bottom: 1px solid var(--border);
}

@media (min-width: 992px) {
    .role-side.students {
        border-bottom: none;
        border-right: 1px solid var(--border);
    }
}

.role-side.instructors {
    background: linear-gradient(135deg, #ffffff 0%, var(--accent-50) 100%);
}

.role-side:hover {
    background-color: white;
}

.role-side h3 { font-size: 2rem; margin-bottom: 1rem; }
.role-side p { font-size: 1.1rem; color: var(--muted); margin-bottom: 2rem; }

.role-side ul { list-style: none; }
.role-side ul li {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.25rem;
    font-size: 1rem;
    line-height: 1.4;
}

.role-side ul li strong { color: var(--text); }

/* Blog Preview */
.blog-preview-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-top: 3rem;
}

@media (min-width: 768px) {
    .blog-preview-grid { grid-template-columns: repeat(3, 1fr); }
}

.blog-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.blog-image {
    width: 100%;
    aspect-ratio: 16/9;
    background: var(--surface-2);
    object-fit: cover;
}

.blog-body {
    padding: 1.5rem;
}

.blog-body h4 { margin-bottom: 0.75rem; }
.blog-body p { color: var(--muted); font-size: 0.9rem; margin-bottom: 1.25rem; }
.blog-date { font-size: 0.8rem; color: var(--brand-500); font-weight: 700; text-transform: uppercase; }

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 72px; /* Slightly more compact */
    z-index: 100;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(248, 250, 252, 0.82);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    box-shadow: inset 0 -1px 0 rgba(255, 255, 255, 0.6);
}

.navbar.scrolled {
    height: 70px;
    background: rgba(255, 255, 255, 0.9);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.03);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    width: 100%;
}

.brand-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--brand-600);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

.brand-logo span {
    background: linear-gradient(135deg, var(--brand-700), var(--brand-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 0.25rem; /* Tighter gap */
    align-items: center;
    margin-left: auto; /* Force to right */
}

.nav-link {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text);
    padding: 0.5rem 0.85rem;
    border-radius: var(--radius-sm);
    opacity: 0.8;
    white-space: nowrap;
}

.nav-link:hover, .nav-link.active {
    color: var(--brand-600);
    background: var(--brand-50);
    opacity: 1;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    background: var(--brand-50);
    color: var(--brand-600);
    padding: 0.6rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.mobile-menu-btn:hover {
    background: var(--brand-100);
    transform: scale(1.05);
}

/* Mobile Menu Overlay */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    z-index: 200;
    display: flex;
    flex-direction: column;
    padding: 2rem;
    transform: translateX(100%);
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-menu.active {
    transform: translateX(0);
}

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4rem;
}

.mobile-menu-close {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--brand-50);
    color: var(--brand-700);
    transition: all 0.3s ease;
}

.mobile-menu-close:hover {
    background: var(--brand-100);
    transform: rotate(90deg);
}

.mobile-menu-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.mobile-link {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(15, 23, 42, 0.05);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-menu.active .mobile-link {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered Link Animations */
.mobile-menu.active .mobile-link:nth-child(1) { transition-delay: 0.1s; }
.mobile-menu.active .mobile-link:nth-child(2) { transition-delay: 0.15s; }
.mobile-menu.active .mobile-link:nth-child(3) { transition-delay: 0.2s; }
.mobile-menu.active .mobile-link:nth-child(4) { transition-delay: 0.25s; }
.mobile-menu.active .mobile-link:nth-child(5) { transition-delay: 0.3s; }
.mobile-menu.active .mobile-link:nth-child(6) { transition-delay: 0.35s; }

.mobile-link.active {
    color: var(--brand-600);
}

.mobile-actions {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-bottom: 2rem;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1) 0.45s;
}

.mobile-menu.active .mobile-actions {
    opacity: 1;
    transform: translateY(0);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--brand-500), var(--brand-600));
    color: white;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--brand-600), var(--brand-700));
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
}

.btn-ghost {
    background: transparent;
    color: var(--muted);
    border-color: var(--border);
}

.btn-ghost:hover {
    background: var(--surface-2);
    border-color: var(--brand-200);
    color: var(--text);
}

/* Utility Classes */
.glass {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.05);
}

.text-gradient {
    background: linear-gradient(135deg, var(--brand-600) 0%, var(--brand-400) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.center-text {
    text-align: center;
}

.section-header {
    margin-bottom: 4rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-header h2 {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: 1rem;
}

.section-sub {
    font-size: 1.15rem;
    color: var(--muted);
    line-height: 1.55;
}

.lead {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 1.5rem;
}

/* Hero Section */
.hero-section {
    --hero-parallax-y: 0px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
    padding-bottom: 100px;
    background: radial-gradient(circle at 70% 20%, var(--brand-100) 0%, transparent 40%),
                radial-gradient(circle at 10% 80%, var(--brand-50) 0%, transparent 40%);
    position: relative;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 10;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    line-height: 1.1;
    letter-spacing: -0.04em;
    margin-bottom: 2rem;
}

.hero-sub {
    font-size: clamp(1.1rem, 2.5vw, 1.35rem);
    color: var(--muted);
    max-width: 800px;
    margin: 0 auto 3.5rem;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    align-items: center;
}

.hero-visual-layer {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 1;
    will-change: transform;
    transform: translate3d(0, var(--hero-parallax-y, 0px), 0);
    transition: transform 0.15s ease-out;
}

.floating-fragment {
    position: absolute;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    padding: 1.25rem;
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.65);
    box-shadow:
        0 20px 40px rgba(15, 23, 42, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.95),
        inset 0 0 0 1px rgba(59, 130, 246, 0.06);
    z-index: 2;
    transition: box-shadow 0.35s ease, background 0.35s ease;
}

.floating-fragment-inner {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

/* Float on inner only — mouse parallax applies to outer .floating-fragment without fighting this */
.frag-1 .floating-fragment-inner { animation: float 7s ease-in-out infinite; }
.frag-2 .floating-fragment-inner { animation: float 9s ease-in-out infinite reverse; }
.frag-3 .floating-fragment-inner { animation: float 8s ease-in-out infinite 0.5s; }

.floating-fragment:hover {
    background: rgba(255, 255, 255, 0.98);
    box-shadow:
        0 24px 48px rgba(15, 23, 42, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 1);
}

.frag-1 { top: 15%; left: 8%; }
.frag-2 { bottom: 15%; right: 8%; }
.frag-3 { top: 25%; right: 12%; }

@media (max-width: 1400px) {
    .frag-1 { left: 3%; max-width: min(220px, 28vw); }
    .frag-2 { right: 3%; max-width: min(200px, 26vw); }
    .frag-3 { right: 8%; max-width: min(200px, 26vw); }
}

/* Avoid overlap with centered hero copy on mid-width desktops */
@media (max-width: 1300px) and (min-width: 1025px) {
    .floating-fragment { display: none; }
}

@media (max-width: 1200px) {
    .frag-1 { left: 2%; }
    .frag-2 { right: 2%; }
}

@media (max-width: 1024px) {
    .floating-fragment { display: none; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* Cards & Components */
.glass-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
    border-color: var(--brand-300);
}

.badge {
    display: inline-block;
    padding: 0.35rem 1rem;
    background: var(--brand-50);
    color: var(--brand-700);
    border-radius: 99px;
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
    border: 1px solid var(--brand-100);
}

/* Feature Cards (for grids) */
.feature-card {
    padding: 2.5rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    transition: all 0.3s ease;
}

.feature-card:hover {
    border-color: var(--brand-400);
    box-shadow: var(--shadow-md);
}

.step-icon {
    width: 64px;
    height: 64px;
    background: var(--brand-50);
    color: var(--brand-600);
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

/* Lists */
.feature-list {
    list-style: none;
}

.feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.feature-list li strong {
    color: var(--text);
}

/* CTA Block */
.cta-block {
    background: linear-gradient(135deg, var(--brand-600), var(--brand-700));
    color: white;
    border-radius: var(--radius-xl);
    padding: 5rem 2rem;
    text-align: center;
}

.cta-block h2 { color: white; }
.cta-block p { color: rgba(255, 255, 255, 0.8); }

/* Footer */
.site-footer {
    background: var(--surface);
    padding: 5rem 0;
    border-top: 1px solid var(--border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}

@media (min-width: 992px) {
    .footer-grid {
        grid-template-columns: 1.5fr repeat(3, 1fr);
    }
}

.footer-payment-logos {
    margin-bottom: 1.25rem;
}

.footer-payment-logos-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 1.25rem 1.75rem;
}

.footer-payment-logos .pay-logo {
    display: block;
    width: auto;
    height: auto;
    object-fit: contain;
}

.footer-payment-logos .pay-logo--iyzico {
    height: 35px;
}

.footer-payment-logos .pay-logo--mc {
    height: 25px;
}

.footer-payment-logos .pay-logo--visa {
    height: 20px;
}

/* Homepage — packages preview (index.html) */
.section-packages-preview {
    background: linear-gradient(180deg, var(--surface) 0%, var(--brand-50) 35%, var(--surface) 100%);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.home-packages-grid {
    display: grid;
    gap: clamp(1.25rem, 3vw, 1.75rem);
    grid-template-columns: 1fr;
    margin-top: 2.5rem;
    max-width: 920px;
    margin-left: auto;
    margin-right: auto;
}

@media (min-width: 768px) {
    .home-packages-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.home-package-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: clamp(1.35rem, 3vw, 1.85rem);
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 0;
    box-shadow: var(--shadow-sm);
    transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.home-package-card:hover {
    border-color: var(--brand-200);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.home-package-card--student {
    border-top: 3px solid var(--brand-500);
}

.home-package-card--instructor {
    border-top: 3px solid var(--accent-500);
}

.home-package-card h3 {
    font-size: clamp(1.15rem, 2.5vw, 1.35rem);
    margin-bottom: 0.5rem;
}

.home-package-card .pkg-lead {
    color: var(--muted);
    font-size: 0.94rem;
    line-height: 1.55;
    margin-bottom: 1rem;
}

.home-package-list {
    list-style: none;
    padding: 0;
    margin: 0;
    flex: 1;
}

.home-package-list li {
    display: flex;
    gap: 0.55rem;
    align-items: flex-start;
    margin-bottom: 0.65rem;
    font-size: 0.9rem;
    line-height: 1.45;
    color: var(--text);
}

.home-package-list li:last-child {
    margin-bottom: 0;
}

.home-package-list svg {
    flex-shrink: 0;
    margin-top: 0.1rem;
}

.home-packages-preview-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1rem;
    justify-content: center;
    align-items: center;
    margin-top: 2.25rem;
}

.home-packages-preview-note {
    text-align: center;
    font-size: 0.88rem;
    color: var(--muted);
    margin-top: 1.15rem;
    max-width: 32rem;
    margin-left: auto;
    margin-right: auto;
}

/* Animations */
.reveal-on-scroll {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.65s cubic-bezier(0.22, 1, 0.36, 1), transform 0.65s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* Extra stagger for grid children (blog) */
.blog-preview-grid .blog-card:nth-child(1).reveal-on-scroll { transition-delay: 0s; }
.blog-preview-grid .blog-card:nth-child(2).reveal-on-scroll { transition-delay: 0.08s; }
.blog-preview-grid .blog-card:nth-child(3).reveal-on-scroll { transition-delay: 0.16s; }

.home-packages-grid .home-package-card:nth-child(1).reveal-on-scroll { transition-delay: 0s; }
.home-packages-grid .home-package-card:nth-child(2).reveal-on-scroll { transition-delay: 0.1s; }

/* Responsive adjustments */
@media (max-width: 1024px) {
    .hero-section { text-align: center; }
    .hero-content { margin: 0 auto; }
    .floating-fragment { display: none; }
}

@media (max-width: 768px) {
    .desktop-nav { display: none; }
    .mobile-menu-btn { display: block; }
}

/* Live Demo Section Styles */
.demo-section {
    scroll-margin-top: 100px;
}

.demo-container {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    min-height: 400px;
}

.demo-phase {
    display: none;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.demo-phase.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.demo-card {
    background: var(--surface);
    border-radius: var(--radius-xl);
    padding: clamp(1.25rem, 5vw, 3rem);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}

.demo-icon {
    width: clamp(60px, 15vw, 80px);
    height: clamp(60px, 15vw, 80px);
    background: var(--brand-50);
    color: var(--brand-600);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.demo-icon svg {
    width: 50%;
    height: 50%;
}

.demo-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
    gap: 0.75rem;
}

.demo-timer {
    font-weight: 700;
    color: var(--brand-600);
    font-variant-numeric: tabular-nums;
    font-size: clamp(0.9rem, 4vw, 1.1rem);
    white-space: nowrap;
}

.demo-title {
    font-weight: 600;
    color: var(--muted);
    font-size: clamp(0.75rem, 3vw, 0.9rem);
    text-align: right;
}

.demo-text-content {
    font-size: clamp(1rem, 4.5vw, 1.15rem);
    line-height: 1.7;
    color: var(--text);
    margin-bottom: 2rem;
    text-align: left; /* Changed from justify for better mobile readability */
    user-select: none;
    max-height: 60vh;
    overflow-y: auto;
    padding-right: 0.5rem;
}

/* Custom scrollbar for demo text */
.demo-text-content::-webkit-scrollbar {
    width: 4px;
}
.demo-text-content::-webkit-scrollbar-track {
    background: var(--brand-50);
}
.demo-text-content::-webkit-scrollbar-thumb {
    background: var(--brand-200);
    border-radius: 2px;
}

.demo-actions {
    display: flex;
    justify-content: center;
    padding-top: 1rem;
}

/* Question Styles */
.demo-question-content {
    margin-top: 0.5rem;
}

.question-text {
    font-size: clamp(1.1rem, 5vw, 1.25rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text);
    line-height: 1.4;
}

.options-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
}

.option-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: clamp(0.85rem, 4vw, 1.25rem);
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    text-align: left;
    transition: all 0.2s ease;
    width: 100%;
    cursor: pointer;
}

.option-btn:hover {
    border-color: var(--brand-300);
    background: var(--brand-50);
}

.option-btn.selected {
    border-color: var(--brand-500);
    background: var(--brand-50);
}

.option-btn.correct {
    border-color: var(--success);
    background: #ecfdf5;
}

.option-btn.wrong {
    border-color: var(--danger);
    background: #fef2f2;
}

.option-letter {
    width: 28px;
    height: 28px;
    background: var(--brand-100);
    color: var(--brand-700);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    flex-shrink: 0;
    font-size: 0.9rem;
}

.option-text {
    font-size: clamp(0.85rem, 3.5vw, 1rem);
    font-weight: 500;
    color: var(--text);
    line-height: 1.4;
}

/* Results Styles */
.results-card {
    border-top: 5px solid var(--success);
}

.success-icon {
    margin-bottom: 1rem;
}

.results-stats {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin: 2rem 0;
    padding: 1.5rem;
    background: var(--brand-50);
    border-radius: var(--radius-lg);
}

@media (min-width: 640px) {
    .results-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }
}

.stat-item {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.5rem;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted);
}

.stat-value {
    font-size: clamp(1.75rem, 6vw, 2.25rem);
    font-weight: 800;
    color: var(--brand-600);
    font-family: var(--font-heading);
    line-height: 1.2;
}

.stat-desc {
    font-size: 0.75rem;
    color: var(--muted);
    line-height: 1.3;
}

.results-note {
    font-size: clamp(0.95rem, 4vw, 1.1rem);
    color: var(--text);
    margin-bottom: 2rem;
    font-weight: 500;
}

.results-footer {
    margin-top: 2rem;
}

.results-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: stretch;
}

@media (min-width: 640px) {
    .results-actions {
        flex-direction: row;
        justify-content: center;
        align-items: center;
    }
    
    .results-actions .btn {
        width: auto;
    }
}