:root {
    --bg: #090d16;
    --bg-alt: #0f1420;
    --bg-card: #151c2c;
    --text: #eaeff5;
    --text-dim: #7b8ba3;
    --accent: #4a8df8;
    --accent-soft: rgba(74,141,248,0.1);
    --accent-border: rgba(74,141,248,0.2);
    --border: rgba(255,255,255,0.06);
    --r: 8px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg); color: var(--text); line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--accent); text-decoration: none; }
ul { list-style: none; }

/* SKIP LINK */
.skip-link {
    position: absolute; top: -100%; left: 50%; transform: translateX(-50%);
    background: var(--accent); color: #fff; padding: 0.6rem 1.5rem; border-radius: 0 0 5px 5px;
    font-size: 0.85rem; font-weight: 600; z-index: 200; text-decoration: none;
    transition: top 0.2s;
}
.skip-link:focus { top: 0; }

/* NAV */
nav { position: fixed; top: 0; width: 100%; z-index: 100; background: rgba(9,13,22,0.92); backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); }
.nav-inner { max-width: 1100px; margin: 0 auto; padding: 0.9rem 2rem; display: flex; justify-content: space-between; align-items: center; }
.nav-name { font-weight: 700; font-size: 0.92rem; color: var(--text); text-decoration: none; }
nav ul { display: flex; gap: 2rem; }
nav ul a { color: var(--text-dim); text-decoration: none; font-size: 0.82rem; font-weight: 500; transition: color 0.2s; }
nav ul a:hover { color: var(--text); }
nav ul a.active { color: var(--accent); }
nav ul a.lang-switch { border: 1px solid var(--accent-border); border-radius: 4px; padding: 0.2rem 0.5rem; font-size: 0.72rem; font-weight: 700; letter-spacing: 0.08em; color: var(--accent); }
nav ul a.lang-switch:hover { background: var(--accent-soft); color: var(--text); }

/* BURGER (hidden on desktop) */
.nav-toggle { display: none; }
.nav-burger { display: none; cursor: pointer; width: 24px; height: 20px; position: relative; z-index: 101; }
.nav-burger span, .nav-burger span::before, .nav-burger span::after {
    display: block; width: 100%; height: 2px; background: var(--text); border-radius: 2px;
    position: absolute; transition: transform 0.3s, opacity 0.2s;
}
.nav-burger span { top: 9px; }
.nav-burger span::before { content: ''; top: -7px; }
.nav-burger span::after { content: ''; top: 7px; }
.nav-toggle:checked ~ .nav-burger span { background: transparent; }
.nav-toggle:checked ~ .nav-burger span::before { top: 0; transform: rotate(45deg); background: var(--text); }
.nav-toggle:checked ~ .nav-burger span::after { top: 0; transform: rotate(-45deg); background: var(--text); }

/* HERO */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; overflow: hidden; }
.hero-bg {
    position: absolute; inset: 0; background-size: cover; background-repeat: no-repeat;
}
.hero-bg::after {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(90deg, rgba(9,13,22,0.93) 0%, rgba(9,13,22,0.72) 40%, rgba(9,13,22,0.15) 100%),
                linear-gradient(to bottom, transparent 60%, var(--bg) 100%);
}
.hero-content { position: relative; z-index: 2; max-width: 1100px; margin: 0 auto; width: 100%; padding: 8rem 2rem 6rem; }
.hero h1 { font-size: clamp(2.2rem, 4.5vw, 3.4rem); font-weight: 900; line-height: 1.1; letter-spacing: -0.03em; margin-bottom: 1.5rem; max-width: 580px; }
.hero .sub { font-size: 1.05rem; color: var(--text-dim); max-width: 500px; line-height: 1.8; margin-bottom: 2.5rem; }
.hero .sub2 { font-size: 1.1rem; color: var(--text); max-width: 500px; line-height: 1.7; margin-bottom: 2.5rem; font-weight: 500; font-style: italic; border-left: 2px solid var(--accent); padding-left: 1rem; }

/* BUTTONS */
.btn { display: inline-block; padding: 0.85rem 2rem; background: var(--accent); color: #fff; border-radius: 5px; text-decoration: none; font-weight: 600; font-size: 0.9rem; transition: background 0.2s, transform 0.15s; }
.btn:hover { background: #3a7ae0; transform: translateY(-1px); }
.btn-outline { background: transparent; border: 1px solid var(--accent); color: var(--accent); }
.btn-outline:hover { background: var(--accent-soft); }

/* STATS BAR */
.stats-bar { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--bg-alt); }
.stats-grid { display: grid; grid-template-columns: repeat(4,1fr); max-width: 1100px; margin: 0 auto; }
.stats-grid.stats-3 { grid-template-columns: repeat(3,1fr); }
.stats-grid .s { text-align: center; padding: 2.5rem 1rem; border-right: 1px solid var(--border); }
.stats-grid .s:last-child { border-right: none; }
.s .num { font-size: 2.2rem; font-weight: 900; }
.s .txt { font-size: 0.78rem; color: var(--text-dim); margin-top: 0.3rem; }

/* BRIDGE */
.bridge { padding: 6.5rem 2rem; }
.bridge p { font-size: 1.05rem; line-height: 1.7; max-width: 720px; color: var(--text); }
.bridge p + p { margin-top: 1.25rem; }

/* LAYOUT */
section { padding: 6.5rem 2rem; }
.wrap { max-width: 1100px; margin: 0 auto; }
.alt { background: var(--bg-alt); }
.label { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent); margin-bottom: 0.75rem; }
h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); font-weight: 800; letter-spacing: -0.02em; line-height: 1.2; margin-bottom: 1rem; }
h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.4rem; }
.prose { font-size: 0.98rem; color: var(--text-dim); max-width: 580px; line-height: 1.85; }
.prose + .prose { margin-top: 0.8rem; }

/* GRIDS */
.g2 { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.g2.flip > :first-child { order: 2; }
.g2.flip > :last-child { order: 1; }
.img-frame { border-radius: var(--r); overflow: hidden; box-shadow: 0 16px 48px rgba(0,0,0,0.35); }
.img-frame img { width: 100%; }

/* PROBLEM GRID */
.problem-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-top: 2rem; }
.problem-card {
    padding: 2rem; background: var(--bg-card); border-radius: var(--r);
    border: 1px solid var(--border); transition: border-color 0.2s;
}
.problem-card:hover { border-color: var(--accent-border); }
.problem-card h3 { color: var(--text); margin-bottom: 0.5rem; }
.problem-card p { font-size: 0.9rem; color: var(--text-dim); line-height: 1.7; }

/* OFFER GRID */
.offer-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; margin-top: 2.5rem; }
.offer-card {
    padding: 2.5rem 2rem; background: var(--bg-card); border-radius: var(--r);
    border: 1px solid var(--border); transition: border-color 0.3s;
}
.offer-card:hover { border-color: var(--accent-border); }
.offer-num { font-size: 2rem; font-weight: 900; color: var(--accent); opacity: 0.3; margin-bottom: 1rem; }
.offer-card h3 { font-size: 1.1rem; margin-bottom: 0.6rem; }
.offer-card p { font-size: 0.88rem; color: var(--text-dim); line-height: 1.7; margin-bottom: 1.2rem; }
.offer-meta { font-size: 0.82rem; color: var(--accent); font-weight: 500; margin-bottom: 1rem; }
.offer-card ul { list-style: none; padding: 0; }
.offer-card li { font-size: 0.84rem; color: var(--text-dim); padding: 0.3rem 0; padding-left: 1.2rem; position: relative; }
.offer-card li::before { content: '—'; position: absolute; left: 0; color: var(--accent); }

/* DIFF GRID */
.diff-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; margin-top: 2.5rem; }
.diff-item { padding: 2rem; background: var(--bg-card); border-radius: var(--r); border: 1px solid var(--border); transition: border-color 0.2s; }
.diff-item:hover { border-color: var(--accent-border); }
.diff-item h3 { color: var(--accent); font-size: 0.95rem; font-weight: 700; margin-bottom: 0.5rem; }
.diff-item p { font-size: 0.92rem; color: var(--text-dim); line-height: 1.75; }

/* DIFF LIST (legacy fallback) */
.diff-list { margin-top: 2rem; }

/* CREDENTIALS */
.creds { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.5rem; }
.cred { padding: 0.4rem 0.85rem; background: var(--accent-soft); border: 1px solid var(--accent-border); border-radius: 4px; font-size: 0.76rem; font-weight: 600; color: var(--accent); }

/* REFS (legacy logo pills) */
.refs { display: flex; flex-wrap: wrap; gap: 0.8rem; justify-content: center; margin-top: 2rem; }
.refs span { padding: 0.5rem 1.1rem; border: 1px solid var(--border); border-radius: 4px; font-size: 0.82rem; font-weight: 500; color: var(--text-dim); }

/* REF LIST (media appearances) */
.ref-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0; margin-top: 2.5rem; max-width: 800px; margin-left: auto; margin-right: auto; }
.ref-row { display: flex; flex-direction: column; padding: 1.2rem 1.4rem; border-bottom: 1px solid var(--border); text-decoration: none; transition: background 0.2s; }
.ref-row:nth-child(odd) { border-right: 1px solid var(--border); }
.ref-row:nth-last-child(-n+2) { border-bottom: none; }
.ref-row:hover { background: rgba(255,255,255,0.03); }
.ref-medium { font-size: 0.95rem; font-weight: 600; color: var(--text); margin-bottom: 0.25rem; }
.ref-topic { font-size: 0.82rem; color: var(--text-dim); line-height: 1.4; }

/* IMAGE STRIP */
.img-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; overflow: hidden; }
.img-strip img { width: 100%; height: 280px; object-fit: cover; filter: brightness(0.65); transition: filter 0.3s; }
.img-strip img:hover { filter: brightness(0.85); }

/* MOSAIC */
.mosaic { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1rem; margin-top: 2.5rem; }
.m-item { border-radius: var(--r); overflow: hidden; box-shadow: 0 12px 36px rgba(0,0,0,0.3); position: relative; }
.m-item img { width: 100%; height: 100%; object-fit: cover; }
.m-tall { grid-row: span 2; }
.m-wide { grid-column: span 2; }
.m-item .overlay { position: absolute; bottom: 0; left: 0; right: 0; padding: 1rem 1.2rem; background: linear-gradient(transparent, rgba(0,0,0,0.8)); }
.m-item .overlay strong { font-size: 0.82rem; display: block; }
.m-item .overlay span { font-size: 0.72rem; color: var(--text-dim); }

/* TALKS LIST */
.talks-list { margin-top: 2.5rem; }
.talks-list table { width: 100%; border-collapse: collapse; }
.talks-list th { text-align: left; font-size: 0.72rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-dim); padding: 0.8rem 0; border-bottom: 1px solid var(--border); }
.talks-list td { padding: 0.75rem 0; border-bottom: 1px solid var(--border); font-size: 0.88rem; vertical-align: top; }
.talks-list td:first-child { color: var(--text-dim); font-size: 0.82rem; width: 60px; }
.talks-list .venue { color: var(--text-dim); font-size: 0.82rem; }
.talks-list .highlight td { color: var(--text); }

/* CONTACT */
.contact { text-align: center; }
.contact .prose { margin: 0 auto 2rem; text-align: center; max-width: 580px; }
.contact-row { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }
.c-link { padding: 0.8rem 1.6rem; background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px; color: var(--text); text-decoration: none; font-weight: 500; font-size: 0.88rem; transition: border-color 0.2s, transform 0.15s; }
.c-link:hover { border-color: var(--accent); transform: translateY(-2px); }

/* CONTACT FORM */
.contact-form { max-width: 580px; margin: 2rem auto 0; text-align: left; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-size: 0.78rem; font-weight: 600; color: var(--text-dim); margin-bottom: 0.4rem; text-transform: uppercase; letter-spacing: 0.08em; }
.form-group .optional { font-weight: 400; text-transform: none; letter-spacing: 0; }
.form-group input,
.form-group textarea {
    width: 100%; padding: 0.75rem 1rem; background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 6px; color: var(--text); font-family: inherit; font-size: 0.9rem;
    transition: border-color 0.2s; outline: none;
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-dim); opacity: 0.5; }
.form-group input:focus,
.form-group textarea:focus { border-color: var(--accent-border); }
.form-group textarea { resize: vertical; min-height: 120px; }
.form-consent { margin: 1rem 0 0.5rem; }
.consent-label { display: flex; align-items: flex-start; gap: 0.6rem; font-size: 0.82rem; color: var(--text-dim); line-height: 1.5; cursor: pointer; }
.consent-label input[type="checkbox"] { margin-top: 0.2rem; accent-color: var(--accent); flex-shrink: 0; width: 16px; height: 16px; }
.consent-label a { color: var(--accent); text-decoration: underline; }
.consent-label a:hover { color: var(--text); }
.contact-form .btn { width: 100%; text-align: center; margin-top: 0.5rem; border: none; cursor: pointer; font-family: inherit; }
.contact-form .btn:disabled { opacity: 0.6; cursor: not-allowed; }
.form-success { text-align: center; padding: 3rem 1rem; }
.success-icon { font-size: 3rem; color: #34d399; margin-bottom: 1rem; }
.form-success h3 { font-size: 1.2rem; margin-bottom: 0.5rem; }
.form-success p { color: var(--text-dim); font-size: 0.92rem; }

/* PARTNER BAR */
.partner-bar { padding: 3rem 2rem; border-top: 1px solid var(--border); }
.partner-logos { display: flex; justify-content: center; align-items: center; gap: 3rem; flex-wrap: wrap; }
.partner-logo { opacity: 0.45; transition: opacity 0.3s; display: flex; align-items: center; }
.partner-logo:hover { opacity: 0.85; }
.partner-logo img { height: 32px; width: auto; filter: grayscale(1); transition: filter 0.3s; }
.partner-logo:hover img { filter: grayscale(0); }

/* FOOTER */
footer { text-align: center; padding: 2rem; font-size: 0.75rem; color: var(--text-dim); border-top: 1px solid var(--border); }

/* PROJECT GRID */
.project-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; margin-top: 2.5rem; }
.project-card {
    padding: 2rem; background: var(--bg-card); border-radius: var(--r);
    border: 1px solid var(--border); transition: border-color 0.2s;
}
.project-card:hover { border-color: var(--accent-border); }
.project-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.6rem; }
.project-card p { font-size: 0.9rem; color: var(--text-dim); line-height: 1.75; margin-bottom: 1rem; }
.project-meta { font-size: 0.78rem; font-weight: 600; color: var(--accent); letter-spacing: 0.03em; }

/* HERO COMPACT (for landing pages) */
.hero-compact { min-height: auto; padding: 0; }
.hero-compact .hero-content { padding: 10rem 2rem 4rem; }

/* MATERIALS LIST */
.materials-list { list-style: none; padding: 0; margin-top: 1.5rem; }
.materials-list li {
    padding: 1.2rem 1.5rem; background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--r); margin-bottom: 0.75rem; transition: border-color 0.2s;
}
.materials-list li:hover { border-color: var(--accent-border); }
.materials-list a { color: var(--text); font-weight: 600; font-size: 0.95rem; text-decoration: none; }
.materials-list .mat-desc { display: block; font-size: 0.82rem; color: var(--text-dim); margin-top: 0.3rem; }

/* RESPONSIVE */
@media (max-width: 820px) {
    .nav-burger { display: block; }
    nav ul {
        display: none; flex-direction: column; gap: 0;
        position: fixed; top: 0; right: 0; width: 260px; height: 100vh;
        background: rgba(9,13,22,0.97); backdrop-filter: blur(20px);
        padding: 5rem 2rem 2rem; border-left: 1px solid var(--border); z-index: 99;
    }
    .nav-toggle:checked ~ ul { display: flex; }
    nav ul li { border-bottom: 1px solid var(--border); }
    nav ul a { display: block; padding: 1rem 0; font-size: 0.95rem; color: var(--text-dim); }
    nav ul a.lang-switch { display: inline-block; margin-top: 1rem; }
    .g2, .g2.flip { grid-template-columns: 1fr; gap: 2rem; }
    .g2.flip > :first-child, .g2.flip > :last-child { order: 0; }
    .problem-grid { grid-template-columns: 1fr; }
    .offer-grid { grid-template-columns: 1fr; }
    .project-grid { grid-template-columns: 1fr; }
    .diff-grid { grid-template-columns: 1fr; }
    .ref-list { grid-template-columns: 1fr; }
    .ref-row:nth-child(odd) { border-right: none; }
    .mosaic { grid-template-columns: 1fr; }
    .mosaic .m-tall, .mosaic .m-wide { grid-row: auto; grid-column: auto; }
    .stats-grid { grid-template-columns: repeat(2,1fr); }
    .stats-grid.stats-3 { grid-template-columns: 1fr; }
    .stats-grid .s:nth-child(2) { border-right: none; }
    .stats-grid.stats-3 .s { border-right: none; }
    section { padding: 4.5rem 1.5rem; }
    .hero-content { padding: 7rem 1.5rem 4rem; }
    .hero-bg::after { background: linear-gradient(to bottom, rgba(9,13,22,0.6) 0%, rgba(9,13,22,0.85) 60%, var(--bg) 100%); }
    .img-strip { grid-template-columns: 1fr; }
    .img-strip img { height: 200px; }
    .talks-list { overflow-x: auto; }
    .form-row { grid-template-columns: 1fr; }
}