/* ============================================================
   Aerlix Design System — Apple-inspired
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Manrope:wght@300;400;500;600;700;800&display=swap');

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

:root {
    --black:    #000000;
    --white:    #ffffff;
    --gray-50:  #f5f5f7;
    --gray-100: #ebebeb;
    --gray-200: #d8d8d8;
    --gray-400: #9a9a9a;
    --gray-600: #6e6e73;
    --gray-800: #1d1d1f;
    --accent:   #e94560;
    --accent-dim: rgba(233,69,96,0.12);
    --font-serif: 'Instrument Serif', Georgia, serif;
    --font-sans:  'Manrope', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --nav-h: 64px;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    background: var(--white);
    color: var(--gray-800);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── NAVBAR ────────────────────────────────────────────────── */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--nav-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 48px;
    z-index: 1000;
    background: rgba(255,255,255,0.82);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    transition: background 0.4s var(--ease), border-color 0.4s var(--ease);
}
.navbar.dark-nav {
    background: rgba(0,0,0,0.72);
    border-color: rgba(255,255,255,0.08);
}

.nav-left { display: flex; align-items: center; }
.logo-img  { height: 36px; width: auto; display: block; }
.navbar.dark-nav .logo-img { filter: invert(1); }

.nav-center { display: flex; gap: 2px; }
.nav-center a {
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.01em;
    color: rgba(0,0,0,0.6);
    text-decoration: none;
    padding: 6px 14px;
    border-radius: 20px;
    transition: color 0.2s, background 0.2s;
}
.nav-center a:hover { color: var(--black); background: rgba(0,0,0,0.06); }
.nav-center a.active { color: var(--black); background: rgba(0,0,0,0.07); font-weight: 600; }
.navbar.dark-nav .nav-center a { color: rgba(255,255,255,0.65); }
.navbar.dark-nav .nav-center a:hover { color: #fff; background: rgba(255,255,255,0.1); }
.navbar.dark-nav .nav-center a.active { color: #fff; background: rgba(255,255,255,0.12); }

.nav-right { display: flex; align-items: center; }
.theme-btn {
    width: 36px; height: 36px; border-radius: 50%;
    background: rgba(0,0,0,0.07); border: none;
    font-size: 16px; cursor: pointer; display: flex;
    align-items: center; justify-content: center;
    transition: transform 0.2s var(--ease-spring), background 0.2s;
}
.navbar.dark-nav .theme-btn { background: rgba(255,255,255,0.1); }
.theme-btn:hover { transform: scale(1.1); }

/* ── SMALL HERO (subpages) ─────────────────────────────────── */
.small-hero {
    min-height: 52vh;
    background: var(--black);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    text-align: center;
    padding: calc(var(--nav-h) + 60px) 40px 80px;
    position: relative;
    overflow: hidden;
}
.small-hero::before {
    content: '';
    position: absolute; inset: 0;
    background: radial-gradient(ellipse 70% 60% at 50% 20%, rgba(233,69,96,0.1) 0%, transparent 70%);
    pointer-events: none;
}
.animated-bg { display: none; } /* no orbs on subpages */

.small-hero h1 {
    font-family: var(--font-serif);
    font-size: clamp(48px, 8vw, 96px);
    font-weight: 400;
    letter-spacing: -0.03em;
    line-height: 1.0;
    color: var(--white);
    margin-bottom: 16px;
    position: relative;
}
.small-hero p {
    font-size: clamp(15px, 2vw, 18px);
    font-weight: 300;
    color: rgba(255,255,255,0.45);
    position: relative;
    max-width: 50ch;
}

/* ── PAGE CONTENT ──────────────────────────────────────────── */
.page-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 80px 40px 100px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.content-card {
    background: var(--gray-50);
    border-radius: 4px;
    padding: 48px 52px;
}
.content-card:first-child { border-radius: 20px 20px 4px 4px; }
.content-card:last-child  { border-radius: 4px 4px 20px 20px; }
.content-card:only-child  { border-radius: 20px; }

.content-card h2 {
    font-family: var(--font-serif);
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 400;
    letter-spacing: -0.025em;
    color: var(--black);
    margin-bottom: 20px;
    line-height: 1.1;
}
.content-card p {
    font-size: 16px;
    font-weight: 400;
    color: var(--gray-600);
    line-height: 1.75;
    margin-bottom: 12px;
}
.content-card p:last-child { margin-bottom: 0; }

/* ── BUTTONS ───────────────────────────────────────────────── */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 14px 28px;
    background: var(--black);
    color: var(--white);
    font-family: var(--font-sans);
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.01em;
    text-decoration: none;
    border-radius: 980px;
    border: none;
    cursor: pointer;
    transition: transform 0.2s var(--ease-spring), background 0.2s;
}
.btn-primary:hover { transform: scale(1.04); background: var(--gray-800); }

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 14px 28px;
    background: transparent;
    color: var(--black);
    font-family: var(--font-sans);
    font-size: 15px;
    font-weight: 500;
    letter-spacing: -0.01em;
    text-decoration: none;
    border-radius: 980px;
    border: 1px solid rgba(0,0,0,0.18);
    cursor: pointer;
    transition: transform 0.2s var(--ease-spring), background 0.2s, border-color 0.2s;
}
.btn-secondary:hover { transform: scale(1.04); background: rgba(0,0,0,0.04); border-color: rgba(0,0,0,0.35); }

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

/* ── SECTION LABEL ─────────────────────────────────────────── */
.section-label-text {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--gray-400);
    margin-bottom: 20px;
    display: block;
}

/* ── CTA SECTION ───────────────────────────────────────────── */
.cta-section {
    background: var(--black);
    padding: 120px 40px;
    text-align: center;
    color: var(--white);
}
.cta-section h2 {
    font-family: var(--font-serif);
    font-size: clamp(42px, 7vw, 80px);
    font-weight: 400;
    letter-spacing: -0.035em;
    line-height: 1.05;
    margin-bottom: 20px;
    color: var(--white);
}
.cta-section p {
    font-size: clamp(15px, 1.8vw, 18px);
    font-weight: 300;
    color: rgba(255,255,255,0.45);
    max-width: 44ch;
    margin: 0 auto 48px;
    line-height: 1.7;
}
.cta-section .hero-buttons { justify-content: center; }
.cta-section .btn-primary {
    background: var(--white);
    color: var(--black);
}
.cta-section .btn-primary:hover { background: var(--gray-50); }
.cta-section .btn-secondary {
    color: var(--white);
    border-color: rgba(255,255,255,0.22);
}
.cta-section .btn-secondary:hover { background: rgba(255,255,255,0.07); border-color: rgba(255,255,255,0.45); }

/* ── FOOTER ────────────────────────────────────────────────── */
.footer {
    background: var(--gray-50);
    border-top: 1px solid var(--gray-100);
    padding: 64px 48px 32px;
}
.footer-content {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}
.footer-brand h3 {
    font-family: var(--font-serif);
    font-size: 24px;
    font-weight: 400;
    letter-spacing: -0.02em;
    color: var(--black);
    margin-bottom: 12px;
}
.footer-brand p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.7;
    font-weight: 400;
}
.footer-links h4 {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--gray-400);
    margin-bottom: 20px;
}
.footer-links ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.footer-links a {
    font-size: 14px;
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 400;
    transition: color 0.2s;
}
.footer-links a:hover { color: var(--black); }
.footer-bottom {
    max-width: 900px;
    margin: 0 auto;
    padding-top: 28px;
    border-top: 1px solid var(--gray-100);
    font-size: 12px;
    color: var(--gray-400);
    font-weight: 400;
}

/* ── TEAM GRID (about page) ────────────────────────────────── */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2px;
    margin-top: 32px;
}
.team-member-card {
    background: var(--white);
    border-radius: 4px;
    padding: 32px 28px;
    cursor: pointer;
    transition: background 0.2s;
    position: relative;
    overflow: hidden;
}
.team-member-card:first-child { border-radius: 16px 4px 4px 4px; }
.team-member-card:last-child  { border-radius: 4px 4px 16px 16px; }
.team-member-card:hover { background: var(--gray-50); }
.decoration-dot, .dot-1 { display: none; }
.card-header { display: flex; align-items: center; gap: 16px; margin-bottom: 0; }
.avatar-wrapper { flex-shrink: 0; }
.member-avatar {
    width: 56px; height: 56px; border-radius: 50%;
    object-fit: cover;
    background: var(--gray-100);
}
.member-name {
    font-size: 17px;
    font-weight: 700;
    color: var(--black);
    letter-spacing: -0.02em;
    margin-bottom: 4px;
}
.member-nickname .nickname-badge {
    font-size: 12px;
    color: var(--gray-400);
    font-weight: 500;
}
.member-role {
    font-size: 13px;
    color: var(--gray-600);
    line-height: 1.5;
    margin-top: 4px;
}
.member-contact { margin-top: 8px; }
.member-contact a {
    font-size: 13px;
    color: var(--accent);
    text-decoration: none;
    transition: opacity 0.2s;
}
.member-contact a:hover { opacity: 0.75; }
.card-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--ease), padding 0.3s;
}
.card-details.expanded { max-height: 400px; padding-top: 24px; }
.bio-section { margin-bottom: 16px; }
.section-label {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--gray-400);
    margin-bottom: 8px;
}
.bio-text { font-size: 14px; color: var(--gray-600); line-height: 1.65; }
.expertise-grid { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.expertise-item {
    display: flex; align-items: center; gap: 6px;
    font-size: 13px; color: var(--gray-600);
}
.expertise-icon { font-size: 15px; }
.skills-container { display: flex; flex-wrap: wrap; gap: 6px; }
.skill-tag {
    font-size: 12px; font-weight: 500;
    color: var(--gray-600);
    background: var(--gray-100);
    padding: 4px 10px; border-radius: 20px;
}
.skill-tag.primary { background: var(--accent-dim); color: var(--accent); }
.expand-hint {
    font-size: 11px;
    color: var(--gray-400);
    margin-top: 16px;
    display: flex;
    align-items: center;
    gap: 4px;
    font-weight: 500;
    letter-spacing: 0.04em;
}

/* ── STATS (index.html legacy compat) ──────────────────────── */
.stats-section {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2px;
    margin-top: 32px;
}
.stat-item {
    background: var(--gray-50);
    padding: 40px 28px;
    text-align: left;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s, transform 0.2s var(--ease-spring);
}
.stat-item:hover { background: var(--gray-100); transform: translateY(-3px); }
.stat-number {
    font-family: var(--font-serif);
    font-size: 52px;
    font-weight: 400;
    line-height: 1;
    color: var(--black);
    letter-spacing: -0.04em;
    margin-bottom: 8px;
}
.stat-label { font-size: 13px; font-weight: 500; color: var(--gray-600); letter-spacing: 0.02em; }

/* ── PROJECTS GRID ─────────────────────────────────────────── */
.project-card {
    background: var(--gray-50) !important;
    border: none !important;
    border-radius: 4px !important;
    padding: 36px 32px !important;
    transition: background 0.2s, transform 0.2s var(--ease-spring) !important;
}
.project-card:hover { background: var(--gray-100) !important; transform: translateY(-4px) !important; }

/* ── CONTACT GRID ──────────────────────────────────────────── */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 2px;
    margin: 0;
}
.contact-info-card {
    background: var(--white);
    border-radius: 4px;
    padding: 40px 32px;
    text-align: center;
}
.contact-info-card:first-child { border-radius: 16px 4px 4px 4px; }
.contact-info-card:last-child  { border-radius: 4px 4px 16px 16px; }
.contact-icon {
    width: 56px; height: 56px;
    background: var(--gray-50);
    border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 20px;
    font-size: 24px;
    transition: transform 0.2s var(--ease-spring);
}
.contact-info-card:hover .contact-icon { transform: scale(1.08); }
.contact-info-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 10px;
    letter-spacing: -0.02em;
}
.contact-info-card p { font-size: 14px; color: var(--gray-600); line-height: 1.65; margin-bottom: 16px; }
.contact-link { color: var(--accent); font-weight: 600; font-size: 15px; text-decoration: none; transition: opacity 0.2s; }
.contact-link:hover { opacity: 0.75; }

.social-links { display: flex; justify-content: center; gap: 10px; margin-top: 16px; }
.social-link {
    width: 38px; height: 38px;
    background: var(--gray-50);
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    transition: background 0.2s, transform 0.2s var(--ease-spring);
    text-decoration: none;
}
.social-link:hover { background: var(--gray-100); transform: translateY(-3px); }
.social-link img { width: 18px; height: 18px; opacity: 0.55; transition: opacity 0.2s; }
.social-link:hover img { opacity: 0.9; }

.qr-display {
    width: 140px; height: 140px;
    background: var(--gray-50);
    border-radius: 12px;
    margin: 16px auto 0;
    display: flex; align-items: center; justify-content: center;
    overflow: hidden;
    font-size: 13px; color: var(--gray-400);
}
.qr-display img { width: 100%; height: 100%; object-fit: cover; }

/* ── FORM INPUTS ───────────────────────────────────────────── */
input[type="text"],
input[type="email"],
textarea {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    background: var(--white);
    color: var(--gray-800);
    font-family: var(--font-sans);
    font-size: 15px;
    font-weight: 400;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    box-sizing: border-box;
}
input:focus, textarea:focus {
    border-color: rgba(0,0,0,0.35);
    box-shadow: 0 0 0 3px rgba(0,0,0,0.05);
}
label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 8px;
    letter-spacing: 0.01em;
}
textarea { resize: vertical; font-family: var(--font-sans); }

/* ── TOOLS GRID ────────────────────────────────────────────── */
.tool-card {
    background: var(--gray-50) !important;
    border: none !important;
    border-radius: 16px !important;
    padding: 28px 20px !important;
    transition: background 0.2s, transform 0.2s var(--ease-spring) !important;
}
.tool-card:hover { background: var(--gray-100) !important; transform: translateY(-3px) !important; }

/* ── FEATURE CARDS (compat) ────────────────────────────────── */
.features-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2px; margin-top: 32px; }
.feature-card {
    background: var(--gray-50);
    padding: 36px 32px;
    border-radius: 4px;
    border: none;
    box-shadow: none;
    transition: background 0.2s;
    text-align: left;
}
.feature-card:hover { background: var(--gray-100); }
.feature-icon { font-size: 28px; margin-bottom: 16px; }
.feature-card h3 { font-size: 17px; font-weight: 700; color: var(--black); margin-bottom: 10px; letter-spacing: -0.02em; }
.feature-card p  { font-size: 14px; color: var(--gray-600); line-height: 1.65; }

/* ── SECTION WRAPPER ───────────────────────────────────────── */
.section {
    padding: 0;
    opacity: 1;
    transform: none;
}
.section.visible { opacity: 1; transform: none; }
.section-alt { background: transparent; }
.section-header { margin-bottom: 40px; }
.section-header h2 {
    font-family: var(--font-serif);
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 400;
    letter-spacing: -0.025em;
    color: var(--black);
    margin-bottom: 8px;
}
.section-header p { font-size: 16px; color: var(--gray-600); font-weight: 400; }

/* ── HIGHLIGHT SECTION (compat) ────────────────────────────── */
.highlight-section { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.highlight-content h2 { font-family: var(--font-serif); font-size: 36px; font-weight: 400; letter-spacing: -0.025em; margin-bottom: 16px; }
.highlight-content p  { font-size: 16px; color: var(--gray-600); line-height: 1.75; margin-bottom: 28px; }
.highlight-visual {
    background: var(--black);
    border-radius: 20px;
    min-height: 280px;
    display: flex; align-items: center; justify-content: center;
    position: relative;
    overflow: hidden;
}
.highlight-visual::before { display: none; }
.highlight-visual-content { text-align: center; color: var(--white); padding: 40px; }
.highlight-visual-content .big-icon { font-size: 48px; margin-bottom: 16px; }
.highlight-visual-content h3 { font-family: var(--font-serif); font-size: 28px; font-weight: 400; margin-bottom: 10px; }
.highlight-visual-content p  { font-size: 14px; color: rgba(255,255,255,0.5); }

/* ── SCROLL REVEAL ─────────────────────────────────────────── */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.in { opacity: 1; transform: none; }
.reveal-d1 { transition-delay: 0.05s; }
.reveal-d2 { transition-delay: 0.15s; }
.reveal-d3 { transition-delay: 0.25s; }
.reveal-d4 { transition-delay: 0.35s; }

/* ── PROJECT DETAIL ────────────────────────────────────────── */
.page-content-single {
    max-width: 900px;
    margin: 0 auto;
    padding: 80px 40px 100px;
}

/* ── RESPONSIVE ────────────────────────────────────────────── */
@media (max-width: 900px) {
    .navbar { padding: 0 24px; flex-wrap: wrap; height: auto; padding-top: 14px; padding-bottom: 14px; }
    .nav-center { order: 3; width: 100%; justify-content: center; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--gray-100); gap: 4px; flex-wrap: wrap; }
    .footer-content { grid-template-columns: 1fr; gap: 36px; }
    .features-grid, .stats-section { grid-template-columns: 1fr 1fr; }
    .highlight-section { grid-template-columns: 1fr; }
    .page-content { padding: 60px 24px 80px; }
    .content-card { padding: 36px 28px; }
    .team-member-card { border-radius: 16px !important; }
    .contact-info-card { border-radius: 16px !important; }
}
@media (max-width: 600px) {
    .stats-section { grid-template-columns: 1fr 1fr; }
    .features-grid { grid-template-columns: 1fr; }
    .hero-buttons { flex-direction: column; align-items: flex-start; }
    .cta-section .hero-buttons { align-items: center; }
    .footer { padding: 48px 24px 24px; }
    .small-hero { padding: calc(var(--nav-h) + 40px) 24px 56px; }
}