:root{color-scheme:light;--bg-deep: #eaf2fb;--bg-surface: #f5f8fc;--bg-elevated: #ffffff;--accent-cyan: #1f7ee8;--accent-purple: #5f6fd8;--accent-green: #199e72;--accent-pink: #d756b5;--accent: var(--accent-cyan);--accent-soft: rgba(31, 126, 232, .08);--accent-strong: rgba(31, 126, 232, .2);--accent-glow: rgba(31, 126, 232, .3);--text-main: #1d2a3a;--text-muted: #4f637b;--text-dim: #6a7b90;--border-subtle: rgba(31, 126, 232, .16);--border-strong: rgba(31, 126, 232, .26);--shadow-soft: 0 8px 26px rgba(30, 73, 122, .08), 0 1px 0 rgba(255, 255, 255, .75) inset;--shadow-strong: 0 12px 30px rgba(26, 64, 111, .12), 0 0 40px rgba(95, 111, 216, .09);--hero-bg: linear-gradient( 135deg, rgba(255, 255, 255, .94) 0%, rgba(243, 248, 255, .92) 52%, rgba(234, 242, 251, .94) 100% );--hero-overlay-a: rgba(31, 126, 232, .1);--hero-overlay-b: rgba(95, 111, 216, .1);--panel-bg: linear-gradient( 135deg, rgba(255, 255, 255, .9) 0%, rgba(242, 247, 255, .86) 100% );--panel-bg-soft: linear-gradient( 135deg, rgba(255, 255, 255, .82) 0%, rgba(242, 247, 255, .76) 100% );--section-odd-bg: linear-gradient( 135deg, rgba(255, 255, 255, .92) 0%, rgba(243, 248, 255, .88) 100% );--section-even-bg: linear-gradient( 135deg, rgba(228, 238, 252, .9) 0%, rgba(214, 229, 248, .86) 100% );--control-bg: rgba(255, 255, 255, .84);--hero-title-start: #0f1f36;--footer-bg: linear-gradient( 180deg, rgba(234, 242, 251, .9) 0%, rgba(225, 236, 248, .98) 100% );--radius-lg: 16px;--radius-xl: 24px;--font-sans: "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif}:root[data-theme=dark]{color-scheme:dark;--bg-deep: #0a0118;--bg-surface: #120828;--bg-elevated: #1a0f35;--accent-cyan: #00f0ff;--accent-purple: #b366ff;--accent-green: #00ff9d;--accent-pink: #ff00ff;--accent-soft: rgba(0, 240, 255, .08);--accent-strong: rgba(0, 240, 255, .18);--accent-glow: rgba(0, 240, 255, .5);--text-main: #e8f4ff;--text-muted: #8ca6c8;--text-dim: #5a6d8a;--border-subtle: rgba(0, 240, 255, .15);--border-strong: rgba(0, 240, 255, .3);--shadow-soft: 0 8px 32px rgba(0, 240, 255, .1), 0 0 64px rgba(179, 102, 255, .08);--shadow-strong: 0 12px 48px rgba(0, 240, 255, .2), 0 0 96px rgba(179, 102, 255, .15);--hero-bg: linear-gradient( 135deg, rgba(18, 8, 40, .95) 0%, rgba(26, 15, 53, .9) 50%, rgba(18, 8, 40, .95) 100% );--hero-overlay-a: rgba(0, 240, 255, .08);--hero-overlay-b: rgba(179, 102, 255, .08);--panel-bg: linear-gradient( 135deg, rgba(26, 15, 53, .6) 0%, rgba(18, 8, 40, .8) 100% );--panel-bg-soft: linear-gradient( 135deg, rgba(26, 15, 53, .3) 0%, rgba(18, 8, 40, .5) 100% );--section-odd-bg: linear-gradient( 135deg, rgba(26, 15, 53, .38) 0%, rgba(18, 8, 40, .54) 100% );--section-even-bg: linear-gradient( 135deg, rgba(16, 9, 34, .62) 0%, rgba(10, 3, 24, .74) 100% );--control-bg: rgba(10, 1, 24, .8);--hero-title-start: #ffffff;--footer-bg: linear-gradient( 180deg, rgba(10, 1, 24, .8) 0%, rgba(10, 1, 24, .95) 100% 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ease;font-size:.8rem}.expand-icon.expanded{transform:rotate(180deg)}@media(max-width:640px){.talk-item{grid-template-columns:1fr;gap:.5rem}.talk-date{font-size:.75rem}.talk-title{font-size:.85rem}.talks-expand-button{padding:.8rem 1.5rem;font-size:.85rem}}.testimonials-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.5rem;margin-top:2rem}.testimonial-card{background:var(--panel-bg-soft);border-radius:var(--radius-lg);padding:1.5rem;border:1px solid var(--border-subtle);box-shadow:0 8px 24px #0006;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);transition:all .3s ease;position:relative;display:flex;flex-direction:column;gap:1rem}.testimonial-card:before{content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;background:linear-gradient(135deg,var(--accent-purple),transparent);-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:opacity .3s ease}.testimonial-card:hover{transform:translateY(-4px);box-shadow:0 12px 32px #00000080,0 0 32px #b366ff33}.testimonial-card:hover:before{opacity:.6}.testimonial-text{margin:0;font-size:.95rem;line-height:1.6;color:var(--text-main);font-style:italic;flex-grow:1}.testimonial-author{margin:0;font-size:.85rem;color:var(--accent-purple);font-weight:600;text-align:right}@media(max-width:640px){.testimonials-grid{grid-template-columns:1fr}}.featured-video-card{margin-top:1.25rem;margin-bottom:2rem;padding:1.2rem;border-radius:var(--radius-lg);background:var(--panel-bg);border:1px solid var(--border-subtle);box-shadow:var(--shadow-soft)}.featured-video-header h3{margin:0;color:var(--text-main);font-size:1.1rem}.featured-video-header p{margin:.4rem 0 .95rem;color:var(--text-muted);font-size:.92rem}.featured-video-frame{position:relative;width:100%;overflow:hidden;border-radius:14px;border:1px solid var(--border-subtle);background:#000;aspect-ratio:16 / 9}.featured-video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}:root:not([data-theme=dark]) .hero-tag{background:#1f7ee81a;border-color:#1f7ee838}:root:not([data-theme=dark]) .btn-primary{color:#f8fbff}:root:not([data-theme=dark]) .hero-info-list li,:root:not([data-theme=dark]) .students-intro,:root:not([data-theme=dark]) .card-tag,:root:not([data-theme=dark]) .media-card-link{background:#1f7ee812;border-color:#1f7ee838}:root:not([data-theme=dark]) .student-list li+li{border-top-color:#1f7ee81f}:root:not([data-theme=dark]) .footer:before{opacity:.6}:root[data-theme=dark] .btn-primary,:root[data-theme=dark] .lang-btn.active{color:#0a0118}@media(max-width:640px){.hero-controls{position:static;justify-content:flex-end;margin-bottom:.85rem}.theme-toggle-text{display:none}}