:root {
    --g-blue: #4285F4;
    --g-red: #EA4335;
    --g-yellow: #FBBC05;
    --g-green: #34A853;
    --bg-main: #FFFFFF;
    --bg-soft: #F8F9FA;
    --border: #E0E0E0;
    --text-main: #202124;
    --text-muted: #5F6368;
    --radius: 14px;
    --elev-1: 0 8px 20px rgba(0,0,0,0.08);
    --elev-2: 0 18px 40px rgba(0,0,0,0.12);
    --elev-inner: inset 0 2px 6px rgba(0,0,0,0.04);
    --font-sans: "Inter", "Poppins", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    --max-width: 1200px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
    margin: 0;
    font-family: var(--font-sans);
    color: var(--text-main);
    background: radial-gradient(800px 400px at 10% 10%, rgba(66,133,244,0.03), transparent 12%),
                radial-gradient(700px 350px at 90% 90%, rgba(234,67,53,0.02), transparent 12%),
                linear-gradient(180deg, var(--bg-main) 0%, color-mix(in srgb, var(--bg-main) 96%, #f1f3f4 4%) 100%);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    padding-top: 110px;
}

a { color: inherit; }

.top-bar {
    position: fixed;
    left: 50%;
    transform: translateX(-50%);
    top: 20px;
    width: min(var(--max-width), calc(100% - 48px));
    height: 68px;
    border-radius: 999px;
    background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(250,250,250,0.98));
    border: 1px solid var(--border);
    box-shadow: var(--elev-2);
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 10px 20px;
    z-index: 1200;
    backdrop-filter: blur(6px) saturate(1.02);
    transition: transform .28s cubic-bezier(.2,.9,.2,1), box-shadow .28s;
}

.top-bar.scrolled {
    transform: translateX(-50%) translateY(-6px) scale(.997);
    box-shadow: 0 28px 60px rgba(0,0,0,0.18);
}

.top-bar .brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-right: 6px;
}

.brand .logo {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: linear-gradient(180deg, #fff, #fbfbfb);
    display: inline-grid;
    place-items: center;
    font-weight: 700;
    color: var(--g-blue);
    box-shadow: 0 8px 20px rgba(0,0,0,0.06), inset 0 1px 0 rgba(255,255,255,0.6);
    border: 1px solid rgba(0,0,0,0.04);
}

.brand .title { display: flex; flex-direction: column; line-height: 1; }
.brand .title .name { font-weight: 700; font-size: 0.95rem; color: var(--text-main); }
.brand .title .sub { font-size: 0.75rem; color: var(--text-muted); margin-top: 2px; }

.top-bar nav {
    display: flex;
    gap: 8px;
    margin-left: 8px;
    margin-right: auto;
}

.top-bar nav a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 999px;
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.95rem;
    background: transparent;
    border: 1px solid transparent;
    transition: background .18s, transform .18s, box-shadow .18s, color .18s;
}

.top-bar nav a:hover {
    background: linear-gradient(180deg, rgba(66,133,244,0.06), rgba(234,67,53,0.02));
    transform: translateY(-2px);
    box-shadow: var(--elev-1);
    color: var(--text-main);
}

.top-bar nav a.active {
    background: linear-gradient(180deg, rgba(66,133,244,0.08), rgba(255,255,255,0.02));
    border: 1px solid rgba(0,0,0,0.04);
    color: var(--text-main);
    box-shadow: 0 8px 20px rgba(0,0,0,0.06), inset 0 1px 0 rgba(255,255,255,0.6);
}

.top-bar .actions { display: flex; gap: 10px; align-items: center; }

.icon-btn {
    height: 44px;
    min-width: 44px;
    display: inline-grid;
    place-items: center;
    border-radius: 10px;
    background: linear-gradient(180deg, #fff, #fbfbfb);
    border: 1px solid var(--border);
    color: var(--text-main);
    cursor: pointer;
    transition: transform .16s, box-shadow .16s;
    box-shadow: 0 6px 14px rgba(0,0,0,0.06);
}

.icon-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--elev-1);
}

.container {
    width: min(var(--max-width), calc(100% - 56px));
    margin: 0 auto;
}

.hero {
    display: grid;
    grid-template-columns: 1fr 420px;
    gap: 36px;
    align-items: start;
    margin-top: 18px;
}

.hero.hero--single { grid-template-columns: 1fr; }

.hero-card, .panel {
    background: linear-gradient(180deg, var(--bg-soft), color-mix(in srgb, var(--bg-soft) 92%, #ffffff 8%));
    border-radius: 18px;
    padding: 36px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.08), inset 0 1px 0 rgba(255,255,255,0.6);
    border: 1px solid var(--border);
}

.hero h1 {
    margin: 0 0 12px;
    font-size: clamp(28px, 3.6vw, 44px);
    color: var(--text-main);
    letter-spacing: -0.6px;
    line-height: 1.02;
}

.hero p.lead { color: var(--text-muted); margin: 0 0 18px; max-width: 680px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }

.btn {
    border-radius: 999px;
    padding: 12px 20px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    border: 1px solid rgba(0,0,0,0.06);
    text-decoration: none;
}

.btn--primary {
    background: linear-gradient(90deg, var(--g-blue), var(--g-green));
    color: #fff;
    box-shadow: 0 12px 30px rgba(0,0,0,0.12);
}

.btn--secondary {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--border);
    box-shadow: 0 6px 18px rgba(0,0,0,0.06);
}

.auth-container {
    width: 100%;
    max-width: 420px;
    border-radius: 16px;
    padding: 18px;
    background: linear-gradient(180deg, var(--bg-soft), color-mix(in srgb, var(--bg-soft) 92%, #fff 8%));
    border: 1px solid var(--border);
    box-shadow: 0 18px 40px rgba(0,0,0,0.08), inset 0 1px 0 rgba(255,255,255,0.6);
}

.auth-tabs { display: flex; gap: 10px; margin-bottom: 14px; }

.auth-tab {
    flex: 1;
    padding: 10px;
    border-radius: 12px;
    background: #fff;
    border: 1px solid var(--border);
    cursor: pointer;
    font-weight: 600;
    color: var(--text-main);
    transition: transform .14s, box-shadow .14s;
}

.auth-tab.active {
    background: linear-gradient(90deg, var(--g-blue), var(--g-red));
    color: #fff;
    box-shadow: 0 10px 26px rgba(0,0,0,0.08);
    transform: translateY(-2px);
}

.auth-form, .form-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

label { font-size: 0.9rem; color: var(--text-main); font-weight: 600; }
input, textarea, select {
    width: 100%;
    padding: 12px 14px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: linear-gradient(180deg, #fff, #fbfbfb);
    box-shadow: var(--elev-inner);
    color: var(--text-main);
    font-size: 0.95rem;
    font-family: var(--font-sans);
}

textarea { min-height: 130px; resize: vertical; }

.btn.full {
    width: 100%;
    justify-content: center;
    border-radius: 10px;
    padding: 12px 14px;
}

.form-status {
    font-size: 0.9rem;
    min-height: 1.2em;
    color: var(--text-muted);
}

.form-status.success { color: var(--g-green); }
.form-status.error { color: var(--g-red); }

.section { margin-top: 36px; }
.section-header h2 { font-size: 1.6rem; margin: 0 0 6px; color: var(--text-main); }
.section-header p { margin: 0 0 18px; color: var(--text-muted); }

.grid {
    display: grid;
    gap: 20px;
    grid-template-columns: repeat(auto-fit, minmax(240px,1fr));
}

.card {
    background: var(--bg-soft);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border);
    box-shadow: 0 10px 30px rgba(0,0,0,0.08), inset 0 2px 0 rgba(255,255,255,0.06);
    transition: transform .22s, box-shadow .22s;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 28px 60px rgba(0,0,0,0.12);
}

.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.site-footer {
    margin-top: 56px;
    background: #f1f3f4;
    border-top: 1px solid var(--border);
}

.footer-wrap {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 34px 20px 22px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: 24px;
}

.footer-title {
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--text-main);
}

.footer-sub {
    color: var(--text-muted);
    margin-top: 6px;
    font-size: 0.95rem;
    line-height: 1.5;
}

.footer-heading {
    margin: 0 0 10px;
    font-size: 0.92rem;
    color: var(--text-main);
}

.footer-links {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 8px;
}

.footer-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.92rem;
}

.footer-links a:hover { color: var(--text-main); text-decoration: underline; }

.footer-bottom {
    margin-top: 20px;
    padding-top: 14px;
    border-top: 1px solid #dadce0;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: space-between;
    color: var(--text-muted);
    font-size: 0.86rem;
}

.hidden { display: none !important; }

.visually-hidden {
    position: absolute !important;
    height: 1px;
    width: 1px;
    overflow: hidden;
    clip: rect(1px,1px,1px,1px);
    white-space: nowrap;
}

@media (max-width: 980px) {
    .top-bar {
        width: calc(100% - 28px);
        left: 50%;
        transform: translateX(-50%);
        padding: 8px 12px;
    }

    .hero {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .container { padding: 0 18px; }

    .footer-grid,
    .two-col {
        grid-template-columns: 1fr;
    }

    body { padding-top: 96px; }
}