:root {
            --deep: #24545e;
            --navy: #2f6673;
            --ocean: #4b8b97;
            --steel: #3fa8b7;
            --azure: #65d6e2;
            --gold: #42b7c7;
            --gold-light: #d8fbff;
            --cream: #f4faf9;
            --white: #ffffff;
            --text: #2a2a2a;
            --text-light: #6a6a6a;
            --glass: rgba(255,255,255,0.05);
            --glass-border: rgba(255,255,255,0.1);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Tajawal', sans-serif;
            background:
                radial-gradient(circle at top right, rgba(79,198,215,0.16), transparent 34%),
                radial-gradient(circle at bottom left, rgba(66,183,199,0.08), transparent 30%),
                linear-gradient(180deg, #f8fcfb 0%, var(--cream) 36%, #eef8f7 100%);
            color: var(--text);
            overflow-x: hidden;
        }

        body::before {
            content: '';
            position: fixed;
            inset: 0;
            pointer-events: none;
            background-image:
                linear-gradient(rgba(33,90,103,0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(33,90,103,0.03) 1px, transparent 1px);
            background-size: 72px 72px;
            mask-image: radial-gradient(circle at center, black 20%, transparent 80%);
            opacity: 0.35;
            z-index: -1;
        }

        /* ============ NAVIGATION ============ */
        nav {
            position: fixed;
            top: 0;
            right: 0;
            left: 0;
            z-index: 1000;
            background: rgba(38, 88, 100, 0.68);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255,255,255,0.08);
            transition: all 0.4s ease;
            box-shadow: 0 12px 34px rgba(28, 84, 96, 0.12);
        }

        nav.scrolled {
            background: rgba(38, 88, 100, 0.82);
            box-shadow: 0 16px 32px rgba(28, 84, 96, 0.16);
        }

        .nav-inner {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 28px;
            display: flex;
            justify-content: flex-start;
            align-items: center;
            gap: 18px;
            height: 78px;
        }

        .nav-logo {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            color: var(--gold);
            text-decoration: none;
        }

        .nav-logo__mark {
            width: 40px;
            height: 40px;
            object-fit: contain;
            filter: drop-shadow(0 10px 22px rgba(79,198,215,0.22));
        }

        .nav-logo__text {
            display: flex;
            flex-direction: column;
            line-height: 1.05;
        }

        .nav-logo__text strong {
            font-family: 'Cairo', sans-serif;
            font-size: 1.45rem;
            font-weight: 700;
            color: var(--gold);
        }

        .nav-logo__text span {
            font-family: 'Playfair Display', serif;
            font-size: 0.8rem;
            color: var(--azure);
            display: block;
            letter-spacing: 3px;
            margin-top: 3px;
        }

        .nav-links {
            display: flex;
            gap: 8px;
            list-style: none;
            flex-wrap: wrap;
            margin-inline-start: auto;
        }

        .nav-tools {
            display: none;
            align-items: center;
            gap: 14px;
        }

        .floating-lang {
            position: fixed;
            inset-inline-end: 22px;
            bottom: 22px;
            z-index: 1200;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 10px;
            border-radius: 999px;
            background: rgba(38, 88, 100, 0.84);
            border: 1px solid rgba(255,255,255,0.14);
            box-shadow: 0 18px 34px rgba(42,114,126,0.18);
            backdrop-filter: blur(16px);
        }

        .floating-lang__icon {
            width: 18px;
            height: 18px;
            stroke: var(--gold-light);
            stroke-width: 1.8;
            fill: none;
            opacity: 0.9;
            flex-shrink: 0;
        }

        .floating-lang__link {
            min-width: 42px;
            padding: 8px 12px;
            border-radius: 999px;
            color: rgba(255,255,255,0.84);
            text-decoration: none;
            font-size: 0.78rem;
            font-weight: 800;
            letter-spacing: 0.8px;
            text-align: center;
            transition: background 0.25s ease, color 0.25s ease, transform 0.25s ease;
        }

        .floating-lang__link:hover {
            color: var(--white);
            background: rgba(255,255,255,0.12);
            transform: translateY(-1px);
        }

        .floating-lang__link.is-active {
            background: linear-gradient(135deg, rgba(255,255,255,0.18), rgba(255,255,255,0.08));
            color: var(--gold-light);
            box-shadow: 0 10px 18px rgba(42,114,126,0.12);
        }

        .nav-links a {
            color: rgba(255,255,255,0.88);
            text-decoration: none;
            font-size: 0.84rem;
            font-weight: 600;
            padding: 10px 14px;
            border-radius: 999px;
            transition: all 0.3s;
        }

        .nav-links a:hover {
            color: var(--gold-light);
            background: rgba(255,255,255,0.07);
        }

        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 5px;
        }

        .hamburger span {
            width: 25px;
            height: 2px;
            background: var(--gold);
            transition: 0.3s;
        }

        /* ============ HERO ============ */
        .hero {
            min-height: 100vh;
            background:
                radial-gradient(circle at 18% 18%, rgba(79,198,215,0.24), transparent 30%),
                radial-gradient(circle at 82% 78%, rgba(63,178,196,0.18), transparent 28%),
                linear-gradient(160deg, #76c9d3 0%, #4f9eab 18%, var(--deep) 42%, var(--navy) 68%, var(--ocean) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
            isolation: isolate;
        }

        .hero::before {
            content: '';
            position: absolute;
            width: 860px;
            height: 860px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(79,198,215,0.16) 0%, transparent 72%);
            top: -220px;
            left: -220px;
            animation: float 20s ease-in-out infinite;
            filter: blur(6px);
        }

        .hero::after {
            content: '';
            position: absolute;
            width: 620px;
            height: 620px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(63,178,196,0.14) 0%, transparent 72%);
            bottom: -170px;
            right: -170px;
            animation: float 25s ease-in-out infinite reverse;
            filter: blur(8px);
        }

        .hero-content::before {
            content: '';
            position: absolute;
            inset: 18px;
            border: 1px solid rgba(255,255,255,0.08);
            border-radius: 28px;
            pointer-events: none;
        }

        @keyframes float {
            0%, 100% { transform: translate(0, 0); }
            50% { transform: translate(40px, -40px); }
        }

        .hero-content {
            text-align: center;
            z-index: 1;
            padding: 46px 42px;
            max-width: 980px;
            position: relative;
            border-radius: 32px;
            background: linear-gradient(180deg, rgba(255,255,255,0.16), rgba(36,84,94,0.14));
            border: 1px solid rgba(255,255,255,0.08);
            box-shadow: 0 26px 56px rgba(34,92,104,0.14);
            backdrop-filter: blur(10px);
        }

        .hero-badge {
            display: inline-block;
            padding: 8px 22px;
            border: 1px solid rgba(174,238,245,0.48);
            border-radius: 999px;
            color: var(--gold-light);
            font-size: 0.82rem;
            font-weight: 600;
            margin-bottom: 28px;
            letter-spacing: 1.2px;
            opacity: 0;
            animation: fadeUp 1s 0.3s forwards;
            background: rgba(255,255,255,0.04);
            box-shadow: inset 0 0 0 1px rgba(255,255,255,0.03);
        }

        .hero-symbol {
            width: 148px;
            height: 148px;
            margin: 0 auto 18px;
            border-radius: 50%;
            display: grid;
            place-items: center;
            background: radial-gradient(circle, rgba(255,255,255,0.16) 0%, rgba(255,255,255,0.03) 64%, transparent 100%);
            box-shadow: 0 22px 46px rgba(4,11,22,0.22);
            opacity: 0;
            animation: fadeUp 1s 0.42s forwards;
        }

        .hero-symbol img {
            width: 120px;
            height: 120px;
            object-fit: contain;
            filter: drop-shadow(0 14px 28px rgba(0,0,0,0.18));
        }

        .hero h1 {
            font-family: 'Cairo', sans-serif;
            font-size: clamp(3.2rem, 8vw, 6rem);
            color: var(--white);
            line-height: 1.12;
            margin-bottom: 10px;
            opacity: 0;
            animation: fadeUp 1s 0.5s forwards;
            text-shadow: 0 12px 36px rgba(0,0,0,0.3);
        }

        .hero h1 .gold {
            color: var(--gold);
        }

        .hero-en {
            font-family: 'Playfair Display', serif;
            font-size: clamp(1.1rem, 3vw, 1.65rem);
            color: #9fe8f1;
            letter-spacing: 7px;
            margin-bottom: 28px;
            opacity: 0;
            animation: fadeUp 1s 0.7s forwards;
            direction: ltr;
            text-shadow: 0 8px 24px rgba(0,0,0,0.18);
        }

        .hero-desc {
            font-size: 1.12rem;
            color: rgba(255,255,255,0.88);
            line-height: 2;
            max-width: 690px;
            margin: 0 auto 42px;
            opacity: 0;
            animation: fadeUp 1s 0.9s forwards;
        }

        .hero-meta {
            display: flex;
            justify-content: center;
            gap: 18px;
            opacity: 0;
            animation: fadeUp 1s 1.1s forwards;
            flex-wrap: wrap;
        }

        .hero-meta-item {
            text-align: center;
            min-width: 160px;
            padding: 18px 20px;
            border-radius: 20px;
            background: rgba(255,255,255,0.12);
            border: 1px solid rgba(255,255,255,0.08);
            box-shadow: inset 0 1px 0 rgba(255,255,255,0.03);
        }

        .hero-meta-item .number {
            font-family: 'Playfair Display', serif;
            font-size: 2.35rem;
            font-weight: 700;
            color: var(--gold-light);
        }

        .hero-meta-item .label {
            font-size: 0.82rem;
            color: rgba(255,255,255,0.76);
            margin-top: 6px;
        }

        .scroll-hint {
            position: absolute;
            bottom: 40px;
            left: 50%;
            transform: translateX(-50%);
            opacity: 0;
            animation: fadeUp 1s 1.5s forwards;
        }

        .scroll-hint span {
            display: block;
            width: 2px;
            height: 40px;
            background: linear-gradient(to bottom, var(--azure), transparent);
            margin: 0 auto;
            animation: scrollPulse 2s infinite;
        }

        @keyframes scrollPulse {
            0%, 100% { opacity: 0.3; transform: scaleY(0.5); }
            50% { opacity: 1; transform: scaleY(1); }
        }

        @keyframes fadeUp {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* ============ SECTIONS ============ */
        .section {
            padding: 110px 30px;
            max-width: 1140px;
            margin: 0 auto;
        }

        .section-dark {
            background: linear-gradient(180deg, #4b8b97 0%, #3a7380 100%);
            max-width: 100%;
            padding: 110px 30px;
            position: relative;
            overflow: hidden;
        }

        .section-dark .section-inner {
            max-width: 1100px;
            margin: 0 auto;
        }

        .section-header {
            text-align: center;
            margin-bottom: 64px;
        }

        .section-number {
            font-family: 'Playfair Display', serif;
            font-size: 0.85rem;
            color: var(--azure);
            letter-spacing: 4px;
            text-transform: uppercase;
            margin-bottom: 12px;
        }

        .section-dark .section-number {
            color: var(--gold);
        }

        .section-title {
            font-family: 'Cairo', sans-serif;
            font-size: clamp(2rem, 4vw, 2.9rem);
            color: var(--navy);
            margin-bottom: 16px;
            line-height: 1.25;
        }

        .section-dark .section-title {
            color: var(--white);
        }

        .section-subtitle {
            font-size: 1.02rem;
            color: var(--text-light);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.9;
        }

        .section-dark .section-subtitle {
            color: rgba(255,255,255,0.88);
        }

        .section-line {
            width: 60px;
            height: 3px;
            background: linear-gradient(to left, var(--gold), var(--azure));
            margin: 20px auto 0;
            border-radius: 2px;
        }

        /* ============ CONCEPT BRIDGE ============ */
        .bridge {
            display: grid;
            grid-template-columns: 1fr auto 1fr;
            gap: 30px;
            align-items: center;
            margin-top: 50px;
        }

        .bridge-box {
            background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(255,255,255,0.92));
            border-radius: 16px;
            padding: 35px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.06);
            border: 1px solid rgba(0,0,0,0.06);
        }

        .bridge-box h3 {
            font-family: 'Cairo', sans-serif;
            font-size: 1.4rem;
            color: var(--navy);
            margin-bottom: 10px;
        }

        .bridge-box p {
            color: var(--text-light);
            line-height: 1.8;
            font-size: 0.95rem;
        }

        .bridge-arrow {
            font-size: 2rem;
            color: var(--gold);
            font-weight: 700;
        }

        .bridge-formula {
            text-align: center;
            margin-top: 44px;
            padding: 28px;
            background: linear-gradient(135deg, #4d96a3, #3b8a97 58%, #58bac7);
            border-radius: 18px;
            color: var(--white);
            box-shadow: 0 18px 36px rgba(42,114,126,0.14);
        }

        .bridge-formula code {
            font-family: 'Playfair Display', serif;
            font-size: 1.4rem;
            letter-spacing: 2px;
            color: var(--gold-light);
        }

        .bridge-formula p {
            margin-top: 10px;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.8);
        }

        /* ============ TRIAD SECTION ============ */
        .triad-section {
            background: linear-gradient(180deg, rgba(255,255,255,0.58) 0%, rgba(244,250,249,0.98) 100%);
        }

        .triad-lead,
        .triad-closing {
            max-width: 880px;
            margin: 0 auto;
            color: var(--text-light);
            line-height: 2;
            font-size: 1rem;
            text-align: center;
        }

        .triad-grid {
            display: grid;
            grid-template-columns: repeat(3, minmax(0, 1fr));
            gap: 20px;
            margin-top: 40px;
        }

        .triad-card {
            background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(255,255,255,0.92));
            border-radius: 16px;
            padding: 30px;
            border: 1px solid rgba(0,0,0,0.06);
            box-shadow: 0 4px 20px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .triad-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 10px 26px rgba(0,0,0,0.08);
        }

        .triad-card-kicker {
            display: inline-block;
            padding: 5px 12px;
            border-radius: 999px;
            background: rgba(66,183,199,0.12);
            color: var(--azure);
            font-size: 0.78rem;
            font-weight: 700;
            margin-bottom: 14px;
        }

        .triad-card h3 {
            font-family: 'Cairo', sans-serif;
            font-size: 1.45rem;
            color: var(--navy);
            margin-bottom: 10px;
        }

        .triad-card p {
            color: var(--text-light);
            line-height: 1.9;
            font-size: 0.95rem;
        }

        .triad-analogy {
            margin-top: 35px;
            padding: 34px;
            border-radius: 18px;
            background: linear-gradient(135deg, #5ca8b3, #4798a5 55%, #69d3df);
            color: var(--white);
            box-shadow: 0 12px 32px rgba(42,114,126,0.14);
        }

        .triad-analogy h3 {
            font-family: 'Cairo', sans-serif;
            font-size: 1.55rem;
            color: var(--gold-light);
            margin-bottom: 14px;
        }

        .triad-analogy p {
            line-height: 2;
            font-size: 0.98rem;
            color: rgba(255,255,255,0.84);
        }

        .triad-proof-header {
            text-align: center;
            margin-top: 50px;
            margin-bottom: 25px;
        }

        .triad-proof-header h3 {
            font-family: 'Cairo', sans-serif;
            font-size: 2rem;
            color: var(--navy);
        }

        .triad-stories {
            margin-top: 0;
        }

        .triad-closing {
            margin-top: 40px;
        }

        /* ============ PRINCIPLES ============ */
        .principles-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 20px;
            margin-top: 40px;
        }

        .principle-card {
            background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));
            border: 1px solid rgba(255,255,255,0.08);
            border-radius: 18px;
            padding: 30px;
            transition: all 0.4s;
            cursor: default;
            box-shadow: inset 0 1px 0 rgba(255,255,255,0.03);
        }

        .principle-card:hover {
            background: rgba(255,255,255,0.08);
            border-color: var(--gold);
            transform: translateY(-4px);
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
        }

        .principle-num {
            font-family: 'Playfair Display', serif;
            font-size: 2rem;
            font-weight: 900;
            color: var(--gold);
            opacity: 0.4;
            margin-bottom: 8px;
        }

        .principle-name {
            font-family: 'Cairo', sans-serif;
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--white);
            margin-bottom: 10px;
        }

        .principle-desc {
            font-size: 0.88rem;
            color: rgba(255,255,255,0.78);
            line-height: 1.85;
        }

        /* ============ STORIES / APPLICATIONS ============ */
        .stories-list {
            display: flex;
            flex-direction: column;
            gap: 30px;
            margin-top: 40px;
        }

        .story-card {
            display: grid;
            grid-template-columns: 80px 1fr;
            gap: 25px;
            background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(255,255,255,0.93));
            border-radius: 22px;
            padding: 36px;
            box-shadow: 0 12px 28px rgba(42,114,126,0.08);
            border: 1px solid rgba(66,183,199,0.12);
            transition: all 0.3s;
        }

        .story-card:hover {
            box-shadow: 0 8px 30px rgba(0,0,0,0.1);
            transform: translateY(-3px);
        }

        .story-icon {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: linear-gradient(135deg, #5aa9b4, #43c0cf);
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: 'Cairo', sans-serif;
            font-size: 1.6rem;
            color: var(--gold);
            font-weight: 700;
            flex-shrink: 0;
        }

        .story-content h3 {
            font-family: 'Cairo', sans-serif;
            font-size: 1.3rem;
            color: var(--navy);
            margin-bottom: 8px;
        }

        .story-content .story-principle {
            display: inline-block;
            padding: 3px 12px;
            background: rgba(66,183,199,0.12);
            color: var(--azure);
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .story-content p {
            color: var(--text-light);
            line-height: 1.85;
            font-size: 0.95rem;
        }

        /* ============ CLASSIFICATION TABLE ============ */
        .class-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 42px;
            background: linear-gradient(180deg, rgba(255,255,255,0.99), rgba(255,255,255,0.95));
            border-radius: 18px;
            overflow: hidden;
            box-shadow: 0 16px 34px rgba(42,114,126,0.08);
        }

        .class-table thead {
            background: linear-gradient(135deg, #5aa9b4, #43c0cf);
        }

        .class-table th {
            padding: 18px 20px;
            color: var(--gold-light);
            font-weight: 600;
            font-size: 0.9rem;
            text-align: right;
        }

        .class-table td {
            padding: 16px 20px;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            font-size: 0.9rem;
            color: var(--text);
            line-height: 1.6;
        }

        .class-table tr:last-child td {
            border-bottom: none;
        }

        .class-table tr:hover td {
            background: rgba(66,183,199,0.06);
        }

        /* ============ MATH SECTION ============ */
        .math-box {
            background: linear-gradient(135deg, #5caab4, #489aa5 60%, #63cdd8);
            border-radius: 22px;
            padding: 54px;
            text-align: center;
            margin-top: 42px;
            box-shadow: 0 18px 36px rgba(42,114,126,0.14);
        }

        .math-formula {
            font-family: 'Playfair Display', serif;
            font-size: clamp(1.4rem, 4vw, 2.2rem);
            color: var(--gold-light);
            letter-spacing: 3px;
            margin-bottom: 25px;
        }

        .math-vars {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 15px;
            margin-top: 25px;
        }

        .math-var {
            background: rgba(255,255,255,0.06);
            border-radius: 10px;
            padding: 15px;
            border: 1px solid rgba(255,255,255,0.08);
        }

        .math-var code {
            font-family: 'Playfair Display', serif;
            color: var(--gold);
            font-size: 1.1rem;
        }

        .math-var p {
            color: rgba(255,255,255,0.8);
            font-size: 0.85rem;
            margin-top: 5px;
        }


        /* ============ RESEARCH HUB ============ */
        .research-intro {
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 24px;
            margin-top: 40px;
        }

        .research-panel,
        .resource-card,
        .presentation-card,
        .media-card {
            background: var(--white);
            border-radius: 16px;
            padding: 30px;
            border: 1px solid rgba(0,0,0,0.06);
            box-shadow: 0 4px 20px rgba(0,0,0,0.05);
        }

        .research-panel h3,
        .resource-card h3,
        .presentation-card h3,
        .media-card h3 {
            font-family: 'Cairo', sans-serif;
            font-size: 1.35rem;
            color: var(--navy);
            margin-bottom: 12px;
        }

        .research-panel p,
        .resource-card p,
        .presentation-card p,
        .media-card p {
            color: var(--text-light);
            line-height: 1.9;
            font-size: 0.95rem;
        }

        .research-points {
            list-style: none;
            margin-top: 18px;
            display: grid;
            gap: 10px;
        }

        .research-points li {
            padding: 12px 14px;
            border-radius: 10px;
            background: rgba(66,183,199,0.10);
            color: var(--navy);
            font-size: 0.92rem;
            line-height: 1.8;
        }

        .resource-grid,
        .presentation-grid,
        .media-grid {
            display: grid;
            grid-template-columns: repeat(3, minmax(0, 1fr));
            gap: 20px;
            margin-top: 30px;
        }

        .resource-tag,
        .presentation-tag,
        .media-tag {
            display: inline-block;
            margin-bottom: 12px;
            padding: 6px 12px;
            border-radius: 999px;
            background: rgba(66,183,199,0.12);
            color: var(--azure);
            font-family: 'Playfair Display', serif;
            font-size: 0.78rem;
            letter-spacing: 1px;
            direction: ltr;
        }

        .resource-link {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            min-width: 150px;
            margin-top: 18px;
            padding: 12px 18px;
            border-radius: 999px;
            background: linear-gradient(135deg, #5aa9b4, #43c0cf);
            color: var(--gold-light);
            text-decoration: none;
            font-weight: 700;
            border: 1px solid rgba(33,90,103,0.14);
            box-shadow: 0 12px 24px rgba(42,114,126,0.12);
            transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease, color 0.25s ease;
        }

        .resource-link:hover {
            color: var(--white);
            background: linear-gradient(135deg, #4ab9c8, #2fa7b8);
            transform: translateY(-2px);
            box-shadow: 0 16px 28px rgba(42,114,126,0.16);
        }

        .resource-link:focus-visible {
            outline: 3px solid rgba(79,198,215,0.3);
            outline-offset: 3px;
        }

        .resource-link--disabled {
            background: linear-gradient(135deg, rgba(111, 150, 156, 0.42), rgba(111, 150, 156, 0.3));
            color: rgba(255,255,255,0.82);
            border-color: rgba(255,255,255,0.12);
            box-shadow: none;
            pointer-events: none;
            cursor: not-allowed;
        }

        .resource-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 18px;
        }

        .resource-actions .resource-link {
            margin-top: 0;
        }

        .media-note {
            margin-top: 14px;
            padding-top: 14px;
            border-top: 1px solid rgba(0,0,0,0.08);
            color: var(--text-light);
            font-size: 0.88rem;
        }

        .audio-player {
            width: 100%;
            margin-top: 18px;
            border-radius: 12px;
        }

        .pdf-preview {
            margin-top: 35px;
            background: var(--white);
            border-radius: 18px;
            border: 1px solid rgba(0,0,0,0.06);
            overflow: hidden;
            box-shadow: 0 4px 20px rgba(0,0,0,0.05);
        }

        .pdf-preview iframe {
            width: 100%;
            height: 620px;
            border: 0;
            display: block;
            background: #f0ede7;
        }

        /* ============ LIBRARY ============ */
        .library-grid {
            display: grid;
            grid-template-columns: repeat(3, minmax(0, 1fr));
            gap: 20px;
            margin-top: 40px;
        }

        .library-card {
            background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(255,255,255,0.92));
            border-radius: 16px;
            padding: 30px;
            border: 1px solid rgba(0,0,0,0.06);
            box-shadow: 0 4px 20px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .library-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 10px 28px rgba(0,0,0,0.08);
        }

        .library-card h3 {
            font-family: 'Cairo', sans-serif;
            font-size: 1.45rem;
            color: var(--navy);
            margin-bottom: 18px;
        }

        .library-card p {
            color: var(--text-light);
            line-height: 1.9;
            font-size: 0.95rem;
        }

        .library-tag {
            display: inline-block;
            margin-bottom: 14px;
            padding: 6px 12px;
            border-radius: 999px;
            background: rgba(66,183,199,0.12);
            color: var(--azure);
            font-family: 'Playfair Display', serif;
            font-size: 0.78rem;
            letter-spacing: 1px;
            direction: ltr;
        }

        .library-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 18px;
        }

        .library-actions .resource-link {
            margin-top: 0;
        }

        .library-card--audio {
            display: flex;
            flex-direction: column;
        }

        /* ============ QUESTIONS ============ */
        .questions-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 20px;
            margin-top: 40px;
        }

        .question-card {
            background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(255,255,255,0.92));
            border-radius: 14px;
            padding: 28px;
            border: 1px solid rgba(0,0,0,0.06);
            transition: all 0.3s;
            position: relative;
            overflow: hidden;
        }

        .question-card::before {
            content: '?';
            position: absolute;
            top: -10px;
            left: 10px;
            font-family: 'Playfair Display', serif;
            font-size: 5rem;
            color: rgba(66,183,199,0.08);
            font-weight: 900;
        }

        .question-card:hover {
            border-color: var(--azure);
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
        }

        .question-card p {
            color: var(--text-light);
            line-height: 1.85;
            font-size: 0.95rem;
            position: relative;
            z-index: 1;
        }

        /* ============ AUTHOR ============ */
        .author-section {
            background: linear-gradient(135deg, #6dc0cb, var(--deep) 42%, var(--navy));
            padding: 90px 30px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .author-name {
            font-family: 'Cairo', sans-serif;
            font-size: 2rem;
            color: var(--gold);
            margin-bottom: 8px;
        }

        .author-title {
            color: rgba(255,255,255,0.88);
            font-size: 0.95rem;
            margin-bottom: 20px;
        }

        .author-year {
            display: inline-block;
            padding: 8px 25px;
            border: 1px solid var(--gold);
            border-radius: 30px;
            color: var(--gold);
            font-family: 'Playfair Display', serif;
            font-size: 1.1rem;
            letter-spacing: 2px;
        }

        /* ============ FOOTER ============ */
        footer {
            background: #4b8b97;
            padding: 30px;
            text-align: center;
            border-top: 1px solid var(--glass-border);
        }

        footer p {
            color: rgba(255,255,255,0.88);
            font-size: 0.8rem;
        }

        footer a {
            color: var(--gold);
            text-decoration: none;
        }

        [dir="ltr"] body {
            text-align: left;
        }

        [dir="ltr"] .nav-logo__text {
            align-items: flex-start;
        }

        [dir="ltr"] .hero h1,
        [dir="ltr"] .section-title,
        [dir="ltr"] .bridge-box h3,
        [dir="ltr"] .triad-card h3,
        [dir="ltr"] .triad-analogy h3,
        [dir="ltr"] .triad-proof-header h3,
        [dir="ltr"] .principle-name,
        [dir="ltr"] .story-content h3,
        [dir="ltr"] .research-panel h3,
        [dir="ltr"] .resource-card h3,
        [dir="ltr"] .presentation-card h3,
        [dir="ltr"] .media-card h3,
        [dir="ltr"] .library-card h3,
        [dir="ltr"] .author-name {
            font-family: 'Playfair Display', serif;
            letter-spacing: 0.2px;
        }

        [dir="ltr"] .hero h1 {
            line-height: 1;
        }

        [dir="ltr"] .section-subtitle,
        [dir="ltr"] .hero-desc,
        [dir="ltr"] .principle-desc,
        [dir="ltr"] .story-content p,
        [dir="ltr"] .bridge-box p,
        [dir="ltr"] .library-card p,
        [dir="ltr"] .question-card p {
            letter-spacing: 0.01em;
        }

        [dir="ltr"] .class-table th,
        [dir="ltr"] .class-table td {
            text-align: left;
        }

        [dir="ltr"] .question-card::before {
            left: auto;
            right: 10px;
        }

        [dir="ltr"] .author-year,
        [dir="ltr"] .section-number,
        [dir="ltr"] .hero-en,
        [dir="ltr"] .library-tag,
        [dir="ltr"] .resource-tag,
        [dir="ltr"] .presentation-tag,
        [dir="ltr"] .media-tag {
            direction: ltr;
        }

        /* ============ RESPONSIVE ============ */
        @media (max-width: 768px) {
            .nav-inner {
                height: 72px;
                padding: 0 20px;
            }
            .nav-links { display: none; }
            .hamburger { display: flex; }
            .nav-tools {
                display: flex;
                gap: 10px;
                margin-inline-start: auto;
            }
            .floating-lang {
                inset-inline-end: 16px;
                bottom: 16px;
                padding: 7px 8px;
            }
            .floating-lang__link {
                min-width: 38px;
                padding: 7px 10px;
            }
            .nav-links.open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 72px;
                right: 14px;
                left: 14px;
                background: rgba(60, 122, 135, 0.94);
                padding: 18px;
                gap: 8px;
                border-radius: 20px;
                border: 1px solid rgba(255,255,255,0.08);
                box-shadow: 0 18px 28px rgba(42,114,126,0.16);
            }
            .hero {
                min-height: auto;
                padding: 110px 18px 56px;
            }
            .hero-content {
                padding: 34px 22px;
                border-radius: 26px;
            }
            .hero-en {
                letter-spacing: 4px;
            }
            .hero-meta {
                flex-direction: column;
                gap: 12px;
            }
            .hero-meta-item {
                min-width: auto;
                width: 100%;
            }
            .section,
            .section-dark {
                padding: 86px 20px;
            }
            .bridge {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .bridge-arrow { transform: rotate(90deg); }
            .story-card {
                grid-template-columns: 1fr;
                text-align: center;
                padding: 28px 22px;
            }
            .story-icon { margin: 0 auto; }
            .bridge-box,
            .triad-card,
            .library-card,
            .question-card {
                padding: 26px 22px;
                border-radius: 18px;
            }
            .principles-grid { grid-template-columns: 1fr; }
            .triad-grid { grid-template-columns: 1fr; }
            .library-grid { grid-template-columns: 1fr; }
            .research-intro,
            .resource-grid,
            .presentation-grid,
            .media-grid { grid-template-columns: 1fr; }
            .pdf-preview iframe { height: 420px; }
            .triad-analogy,
            .math-box { padding: 26px 22px; }
            .scroll-hint { display: none; }
        }

        @media (max-width: 520px) {
            .hero h1 {
                font-size: 2.85rem;
            }
            .hero-desc,
            .triad-lead,
            .triad-closing,
            .story-content p,
            .question-card p,
            .section-subtitle {
                font-size: 0.95rem;
            }
            .section-title {
                font-size: 2rem;
            }
            .nav-logo__mark {
                width: 34px;
                height: 34px;
            }
            .nav-logo__text strong {
                font-size: 1.2rem;
            }
            .nav-logo__text span {
                font-size: 0.68rem;
                letter-spacing: 2px;
            }
            .floating-lang__icon {
                width: 16px;
                height: 16px;
            }
            .floating-lang__link {
                font-size: 0.72rem;
            }
            .hero-symbol {
                width: 112px;
                height: 112px;
                margin-bottom: 16px;
            }
            .hero-symbol img {
                width: 92px;
                height: 92px;
            }
        }