/* ============================================================
   Design System
   ============================================================ */
:root {
    --color-bg: #0b1220;
    --color-bg-elevated: #111827;
    --color-surface: #ffffff;
    --color-surface-muted: #f8fafc;
    --color-border: #e2e8f0;
    --color-border-strong: #cbd5e1;
    --color-text: #0f172a;
    --color-text-muted: #64748b;
    --color-text-inverse: #f1f5f9;
    --color-primary: #11a791;
    --color-primary-hover: #0fb991;
    --color-primary-soft: rgba(17, 167, 145, 0.12);
    --color-accent: #0ab599;
    --color-success: #059669;
    --color-error: #dc2626;
    --color-error-bg: #fef2f2;
    --color-navy: #0f172a;
    --color-slate: #1e293b;
    --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 4px 12px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.12);
    --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --container: 1120px;
    --container-narrow: 720px;
    --header-h: 72px;
    --transition: 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-surface-muted);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

button,
input,
select {
    font: inherit;
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
}

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: background var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--color-primary-hover);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border-strong);
}

.btn-secondary:hover {
    background: var(--color-surface-muted);
    border-color: var(--color-text-muted);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

.btn-text {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
    padding: 4px 0;
}

.btn-text:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-h);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    gap: 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.brand-mark {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    /* background: linear-gradient(135deg, var(--color-primary), var(--color-accent)); */
    position: relative;
}

.brand-mark::after {
    content: "";
    position: absolute;
    inset: 8px;
    /* border: 2px solid rgba(255, 255, 255, 0.9); */
    border-radius: 4px;
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.brand-text strong {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--color-navy);
}

.brand-sub {
    font-size: 0.6875rem;
    color: var(--color-text-muted);
    font-weight: 500;
    letter-spacing: 0.02em;
}

.main-nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    display: block;
    padding: 8px 12px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
    transition: color var(--transition), background var(--transition);
}

.nav-link:hover,
.nav-link:focus-visible {
    color: var(--color-navy);
    background: var(--color-surface-muted);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 8px;
    border-radius: var(--radius-sm);
}

.nav-toggle-bar {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-navy);
    border-radius: 1px;
    transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
    background: linear-gradient(160deg, var(--color-bg) 0%, var(--color-bg-elevated) 50%, #0f1c2e 100%);
    color: var(--color-text-inverse);
    padding: 80px 0 72px;
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.hero-eyebrow {
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.hero-title {
    font-size: clamp(1.875rem, 4vw, 2.75rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
    color: #fff;
}

.hero-lead {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: #94a3b8;
    max-width: 520px;
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.hero .btn-secondary {
    border-color: rgba(255, 255, 255, 0.25);
    color: #e2e8f0;
}

.hero .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.4);
    color: #fff;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-diagram {
    position: relative;
    width: 100%;
    max-width: 380px;
    aspect-ratio: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 16px;
    padding: 24px;
}

.diagram-node {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8125rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.04);
    color: #cbd5e1;
    transition: background var(--transition), border-color var(--transition);
}

.diagram-node--cloud {
    grid-column: 1 / -1;
    background: rgba(17, 167, 145, 0.15);
    border-color: rgba(17, 167, 145, 0.35);
    color: var(--color-primary);
}

.diagram-node:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
}

/* ============================================================
   Platforms
   ============================================================ */
.platforms {
    padding: 48px 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 16px;
}

.platform-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 20px 16px;
    background: var(--color-surface-muted);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
    cursor: pointer;
    text-align: left;
}

.platform-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.platform-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: #fff;
    margin-bottom: 4px;
}

.platform-icon--aws { background: #ff9900; }
.platform-icon--azure { background: #0078d4; }
.platform-icon--gcp { background: #4285f4; }
.platform-icon--docker { background: #2496ed; }
.platform-icon--k8s { background: #326ce5; }
.platform-icon--lambda { background: #ff9900; }

.platform-name {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--color-navy);
}

.platform-desc {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    line-height: 1.45;
    flex: 1;
}

.platform-count {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-top: 4px;
}

/* ============================================================
   CTA Band
   ============================================================ */
.cta-band {
    padding: 40px 0;
    background: var(--color-bg);
    color: var(--color-text-inverse);
}

.cta-band-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.cta-band-text h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: #fff;
}

.cta-band-text p {
    font-size: 0.9375rem;
    color: #94a3b8;
    max-width: 520px;
}

/* ============================================================
   Resources Section
   ============================================================ */
.resources-section {
    padding: 64px 0 80px;
}

.section-header {
    margin-bottom: 36px;
    max-width: 640px;
}

.section-title {
    font-size: clamp(1.5rem, 3vw, 1.875rem);
    font-weight: 700;
    color: var(--color-navy);
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.section-lead {
    font-size: 1.0625rem;
    color: var(--color-text-muted);
    line-height: 1.65;
}

/* Filters */
.filters-bar {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
    padding: 20px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.filter-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.filter-btn {
    padding: 7px 14px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-text-muted);
    background: var(--color-surface-muted);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.filter-btn:hover {
    color: var(--color-navy);
    border-color: var(--color-border-strong);
}

.filter-btn.is-active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.filter-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.search-wrap {
    flex: 1;
    min-width: 200px;
}

.search-input {
    width: 100%;
    padding: 10px 14px;
    font-size: 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.search-input::placeholder {
    color: #94a3b8;
}

.sort-select {
    padding: 10px 14px;
    font-size: 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    min-width: 160px;
    cursor: pointer;
}

.sort-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.resources-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    min-height: 28px;
}

.resources-count {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

/* Resource Grid */
.resource-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.resource-card {
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

.resource-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
    border-color: var(--color-border-strong);
}

.resource-card-image-wrap {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--color-bg-elevated);
    cursor: pointer;
}

.resource-card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.35s ease;
}

.resource-card:hover .resource-card-image {
    transform: scale(1.05);
}

.resource-card-body {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 20px;
    gap: 10px;
}

.resource-platform {
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-primary);
}

.resource-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-navy);
    line-height: 1.35;
    letter-spacing: -0.01em;
}

.resource-desc {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.55;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.resource-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tech-tag {
    font-size: 0.6875rem;
    font-weight: 600;
    padding: 3px 8px;
    background: var(--color-surface-muted);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text-muted);
}

.resource-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 8px;
    padding-top: 12px;
    border-top: 1px solid var(--color-border);
}

.difficulty-badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 999px;
}

.difficulty-badge--beginner {
    background: #ecfdf5;
    color: #059669;
}

.difficulty-badge--intermediate {
    background: #eff6ff;
    color: #2563eb;
}

.difficulty-badge--advanced {
    background: #fef3c7;
    color: #d97706;
}

.btn-read-more {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-primary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    transition: background var(--transition), color var(--transition);
}

.btn-read-more:hover {
    background: var(--color-primary-soft);
    color: var(--color-primary-hover);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 64px 24px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.empty-state h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-navy);
    margin-bottom: 8px;
}

.empty-state p {
    color: var(--color-text-muted);
    margin-bottom: 20px;
}

/* ============================================================
   Final CTA
   ============================================================ */
.final-cta {
    padding: 72px 0;
    background: linear-gradient(160deg, var(--color-bg) 0%, var(--color-bg-elevated) 100%);
    color: var(--color-text-inverse);
    text-align: center;
}

.final-cta-inner {
    max-width: 640px;
    margin: 0 auto;
}

.final-cta h2 {
    font-size: clamp(1.5rem, 3vw, 1.875rem);
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.final-cta p {
    font-size: 1.0625rem;
    color: #94a3b8;
    line-height: 1.7;
    margin-bottom: 28px;
}

.final-cta-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}

.final-cta .btn-secondary {
    border-color: rgba(255, 255, 255, 0.25);
    color: #e2e8f0;
}

.final-cta .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.4);
    color: #fff;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
    background: var(--color-navy);
    color: #94a3b8;
    padding-top: 56px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 48px;
}

.footer-brand strong {
    display: block;
    font-size: 1rem;
    color: #fff;
    margin-bottom: 12px;
}

.footer-brand p {
    font-size: 0.875rem;
    line-height: 1.6;
    max-width: 280px;
}

.footer-col h3 {
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #e2e8f0;
    margin-bottom: 16px;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-col a {
    font-size: 0.875rem;
    color: #94a3b8;
    transition: color var(--transition);
}

.footer-col a:hover {
    color: var(--color-primary);
}

.footer-social {
    display: flex;
    gap: 16px;
    margin-top: 20px;
}

.footer-social a {
    font-size: 0.8125rem;
    font-weight: 600;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 20px 0;
}

.footer-bottom p {
    font-size: 0.8125rem;
    color: #64748b;
}

/* ============================================================
   Modal
   ============================================================ */
.modal {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.modal[hidden] {
    display: none;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
}

.modal-panel {
    position: relative;
    width: 100%;
    max-width: 720px;
    max-height: 90vh;
    overflow-y: auto;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    animation: modalIn 0.25s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.96) translateY(12px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
    z-index: 2;
    transition: background var(--transition), color var(--transition);
}

.modal-close:hover {
    background: var(--color-surface-muted);
    color: var(--color-navy);
}

.modal-body {
    padding: 40px 36px 36px;
}

.modal-platform {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-navy);
    letter-spacing: -0.02em;
    margin-bottom: 8px;
    line-height: 1.3;
    padding-right: 40px;
}

.modal-difficulty {
    display: inline-block;
    margin-bottom: 24px;
}

.modal-section {
    margin-bottom: 24px;
}

.modal-section h3 {
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-muted);
    margin-bottom: 10px;
}

.modal-section p {
    font-size: 0.9375rem;
    color: var(--color-text);
    line-height: 1.65;
}

.modal-section ul {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.modal-section li {
    font-size: 0.9375rem;
    color: var(--color-text);
    padding-left: 16px;
    position: relative;
}

.modal-section li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-primary);
}

.modal-tech-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.modal-tech-list span {
    font-size: 0.8125rem;
    font-weight: 600;
    padding: 5px 12px;
    background: var(--color-surface-muted);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    color: var(--color-text);
}

.modal-steps {
    counter-reset: step;
}

.modal-steps li {
    counter-increment: step;
    padding-left: 36px;
    position: relative;
    margin-bottom: 10px;
}

.modal-steps li::before {
    content: counter(step, decimal-leading-zero);
    position: absolute;
    left: 0;
    top: 0;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-primary);
    width: 28px;
    background: none;
    border-radius: 0;
    height: auto;
}

.modal-cta {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.modal-cta p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    flex: 1;
    min-width: 180px;
}

/* ============================================================
   Gallery
   ============================================================ */
.gallery {
    position: fixed;
    inset: 0;
    z-index: 300;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(11, 18, 32, 0.95);
}

.gallery[hidden] {
    display: none;
}

.gallery-backdrop {
    position: absolute;
    inset: 0;
}

.gallery-close {
    position: absolute;
    top: 20px;
    right: 24px;
    width: 44px;
    height: 44px;
    font-size: 1.75rem;
    color: #e2e8f0;
    z-index: 2;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

.gallery-close:hover {
    background: rgba(255, 255, 255, 0.1);
}

.gallery-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    font-size: 2rem;
    color: #e2e8f0;
    z-index: 2;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    transition: background var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.gallery-nav:hover {
    background: rgba(255, 255, 255, 0.15);
}

.gallery-prev {
    left: 20px;
}

.gallery-next {
    right: 20px;
}

.gallery-content {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    max-width: 90vw;
    max-height: 90vh;
    z-index: 1;
}

.gallery-main-img {
    max-width: 85vw;
    max-height: 65vh;
    object-fit: contain;
    border-radius: var(--radius-md);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
}

.gallery-thumbs {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
}

.gallery-thumb {
    width: 64px;
    height: 40px;
    object-fit: cover;
    border-radius: 6px;
    border: 2px solid transparent;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity var(--transition), border-color var(--transition);
}

.gallery-thumb:hover,
.gallery-thumb.is-active {
    opacity: 1;
    border-color: var(--color-primary);
}

.gallery-counter {
    font-size: 0.875rem;
    color: #94a3b8;
    font-weight: 500;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1199px) {
    .platform-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .resource-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

@media (max-width: 767px) {
    .nav-toggle {
        display: flex;
    }

    .main-nav {
        position: fixed;
        top: var(--header-h);
        left: 0;
        right: 0;
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        padding: 16px 24px 24px;
        transform: translateY(-120%);
        opacity: 0;
        visibility: hidden;
        transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
        z-index: 99;
        justify-content: flex-start;
    }

    .main-nav.is-open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        align-items: stretch;
        width: 100%;
        gap: 2px;
    }

    .nav-link {
        padding: 12px 16px;
        font-size: 1rem;
    }

    .header-actions .btn {
        display: none;
    }

    .hero {
        padding: 48px 0 56px;
    }

    .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-visual {
        order: -1;
    }

    .hero-diagram {
        max-width: 280px;
        margin: 0 auto;
    }

    .platform-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .platform-card {
        padding: 16px 12px;
    }

    .cta-band-inner {
        flex-direction: column;
        text-align: center;
    }

    .resource-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .filters-bar {
        padding: 16px;
    }

    .filter-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .sort-select {
        width: 100%;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .modal-body {
        padding: 32px 20px 24px;
    }

    .modal-title {
        font-size: 1.25rem;
    }

    .gallery-nav {
        width: 40px;
        height: 40px;
        font-size: 1.5rem;
    }

    .gallery-prev {
        left: 8px;
    }

    .gallery-next {
        right: 8px;
    }

    .gallery-main-img {
        max-height: 55vh;
    }
}

@media (max-width: 374px) {
    .platform-grid {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 0 16px;
    }
}

/* Body lock when modal open */
body.modal-open {
    overflow: hidden;
}