/* ========== DESIGN TOKENS ========== */
:root {
    --bg-primary: #FAFBFC;
    --bg-secondary: #FFFFFF;
    --bg-elevated: #FFFFFF;
    --bg-muted: #F4F6F8;
    --text-primary: #0A1628;
    --text-secondary: #57606A;
    --text-tertiary: #8B949E;
    --accent: #0052FF;
    --accent-bright: #0052FF;
    --accent-dim: rgba(0, 82, 255, 0.1);
    --accent-glow: rgba(0, 82, 255, 0.4);
    --positive: #10B981;
    --negative: #EF4444;
    --warning: #F59E0B;
    --border: rgba(0, 0, 0, 0.06);
    --border-strong: rgba(0, 0, 0, 0.1);
    --font-display: 'Instrument Serif', Georgia, serif;
    --font-body: 'Space Grotesk', system-ui, sans-serif;
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 40px;
    --space-2xl: 64px;
    --space-3xl: 100px;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 100px;
    --shadow-subtle: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-card: 0 4px 24px rgba(0,0,0,0.06);
    --shadow-elevated: 0 12px 48px rgba(0,0,0,0.08);
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* ========== RESET & BASE ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-width: 320px;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; height: auto; }

/* ========== ANIMATIONS ========== */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}
.animate-fade-up {
    animation: fadeUp 0.8s var(--transition-slow) forwards;
    opacity: 0;
}
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

/* ========== LAYOUT ========== */
.container { max-width: 1240px; margin: 0 auto; padding: 0 var(--space-lg); }

/* ========== HEADER ========== */
.header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: #FFFFFF;
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}
.header__inner {
    display: flex; align-items: center; justify-content: space-between; height: 72px;
}
.logo {
    display: flex; align-items: center; gap: 12px;
    font-family: var(--font-body); font-size: 18px; font-weight: 600; letter-spacing: -0.02em;
}
.logo__mark {
    width: 36px; height: 36px; background: var(--text-primary);
    border-radius: var(--radius-sm); display: flex; align-items: center;
    justify-content: center; position: relative; overflow: hidden;
}
.logo__mark::before {
    content: ''; position: absolute; width: 20px; height: 20px;
    background: var(--accent); border-radius: 50%; top: -6px; right: -6px;
}
.logo__mark::after {
    content: ''; position: absolute; width: 12px; height: 12px;
    background: var(--bg-primary); border-radius: 50%; bottom: 8px; left: 8px;
}
.nav { display: flex; align-items: center; gap: var(--space-xl); }
.nav__link {
    font-size: 14px; font-weight: 500; color: var(--text-secondary);
    transition: color var(--transition-fast);
}
.nav__link:hover { color: var(--text-primary); }
.nav__link.active,
.nav__link--active { color: var(--text-primary); }
.header__actions { display: flex; align-items: center; gap: var(--space-md); }

/* ========== BUTTONS ========== */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 10px 20px; font-family: var(--font-body); font-size: 14px; font-weight: 500;
    border-radius: var(--radius-md); border: none; cursor: pointer;
    transition: all var(--transition-base);
}
.btn--ghost { background: transparent; color: var(--text-secondary); }
.btn--ghost:hover { color: var(--text-primary); background: var(--bg-muted); }
.btn--primary { background: var(--text-primary); color: var(--bg-primary); }
.btn--primary:hover { background: #24292F; transform: translateY(-1px); box-shadow: var(--shadow-card); }
.btn--accent { background: var(--accent); color: #FFFFFF; font-weight: 600; }
.btn--accent:hover { box-shadow: 0 0 30px rgba(0, 82, 255, 0.4); transform: translateY(-1px); }
.btn--outline { background: transparent; border: 1px solid var(--border); color: var(--text-secondary); }
.btn--outline:hover { border-color: var(--accent); color: var(--text-primary); }
.btn--small { padding: 8px 16px; font-size: 13px; }
.btn--large { padding: 14px 28px; font-size: 15px; }

/* ========== MOBILE TOGGLE ========== */
.mobile-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.mobile-toggle span { display: block; width: 20px; height: 1.5px; background: var(--text-primary); margin: 5px 0; transition: all var(--transition-fast); }

/* ========== DROPDOWN ========== */
.dropdown { position: relative; }
.dropdown__toggle {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 10px 20px; font-family: var(--font-body); font-size: 14px; font-weight: 500;
    background: transparent; color: var(--text-secondary); border: none; cursor: pointer;
    border-radius: var(--radius-md); transition: all var(--transition-fast);
}
.dropdown__toggle:hover { color: var(--text-primary); background: var(--bg-muted); }
.dropdown__toggle svg { width: 12px; height: 12px; transition: transform var(--transition-fast); }
.dropdown.active .dropdown__toggle svg { transform: rotate(180deg); }
.dropdown__menu {
    position: absolute; top: calc(100% + 8px); right: 0; min-width: 280px;
    max-width: calc(100vw - 48px);
    background: var(--bg-secondary); border: 1px solid var(--border);
    border-radius: var(--radius-md); box-shadow: var(--shadow-elevated);
    opacity: 0; visibility: hidden; transform: translateY(-10px);
    transition: all var(--transition-base); z-index: 100;
}
.dropdown.active .dropdown__menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown__menu__header { padding: var(--space-md); border-bottom: 1px solid var(--border); }
.dropdown__menu__header h4 { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-tertiary); }
.dropdown__menu__item { display: flex; align-items: center; gap: var(--space-md); padding: var(--space-md); transition: background var(--transition-fast); }
.dropdown__menu__item:hover { background: var(--bg-muted); }
.dropdown__menu__item__icon { width: 40px; height: 40px; background: var(--accent-dim); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 18px; }
.dropdown__menu__item__content h5 { font-size: 14px; font-weight: 600; margin-bottom: 2px; }
.dropdown__menu__item__content p { font-size: 12px; color: var(--text-tertiary); }
.dropdown__menu__footer { padding: var(--space-md); border-top: 1px solid var(--border); background: var(--bg-muted); border-radius: 0 0 var(--radius-md) var(--radius-md); }
.dropdown__menu__footer a { font-size: 13px; color: var(--accent); font-weight: 500; }

/* ========== FOOTER ========== */
.footer {
    background: var(--bg-muted);
    padding: var(--space-2xl) 0;
    border-top: 1px solid var(--border);
}
.footer__inner {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--space-2xl);
}
.footer__brand { max-width: 260px; }
.footer__brand p {
    margin-top: var(--space-md);
    font-size: 14px;
    color: var(--text-tertiary);
    line-height: 1.7;
}
.footer__column h4 {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    margin-bottom: var(--space-md);
}
.footer__column ul li { margin-bottom: var(--space-sm); }
.footer__column ul a {
    font-size: 14px;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}
.footer__column ul a:hover { color: var(--text-primary); }
.footer__bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--space-2xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border);
}
.footer__bottom p { font-size: 13px; color: var(--text-tertiary); }
.footer__socials { display: flex; gap: var(--space-sm); }
.footer__socials a {
    width: 36px; height: 36px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 50%;
    background: var(--bg-secondary);
    color: var(--text-tertiary);
    font-size: 14px;
    transition: all var(--transition-fast);
}
.footer__socials a:hover {
    background: var(--text-primary);
    color: var(--bg-primary);
}

/* ========== RESPONSIVE: SHARED ========== */
@media (max-width: 1024px) {
    .footer__inner { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav { display: none; }
    .mobile-toggle { display: block; }

    /* Mobile Menu */
    .mobile-menu { display: none; position: fixed; top: 72px; left: 0; right: 0; bottom: 0; background: var(--bg-primary); z-index: 999; padding: var(--space-lg); overflow-y: auto; }
    .mobile-menu.active { display: block; }
    .mobile-menu__nav { display: flex; flex-direction: column; gap: var(--space-sm); }
    .mobile-menu__link { display: block; padding: var(--space-md) var(--space-lg); font-size: 17px; font-weight: 500; color: var(--text-secondary); border-radius: var(--radius-md); transition: all var(--transition-fast); }
    .mobile-menu__link:hover { color: var(--text-primary); background: var(--bg-muted); }
    .mobile-menu__actions { margin-top: var(--space-xl); padding-top: var(--space-lg); border-top: 1px solid var(--border); }
    .mobile-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
    .mobile-toggle.active span:nth-child(2) { opacity: 0; }
    .mobile-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

    /* Footer */
    .footer__inner { grid-template-columns: 1fr; gap: var(--space-xl); }
    .footer__bottom { flex-direction: column; gap: var(--space-md); text-align: center; }
}

@media (max-width: 480px) {
    .container { padding: 0 var(--space-md); }
    .dropdown__menu { max-width: calc(100vw - 32px); }
}