/* ---------- design tokens ---------- */
:root {
    --bg-deep:   #0b0d10;
    --bg-1:      #14171c;
    --bg-2:      #1c2026;
    --bg-3:      #262b33;
    --border:    rgba(255, 255, 255, 0.07);
    --border-strong: rgba(255, 255, 255, 0.14);
    --text:      #e6e8eb;
    --muted:     #9aa1ac;
    --muted-2:   #6c7280;
    --accent:    #8fa3ff;
    --accent-dim: #4b5da6;
    --danger:    #ff8a8a;

    --glass-bg:    rgba(20, 23, 28, 0.62);
    --glass-blur:  blur(20px) saturate(140%);
    --glass-edge:  rgba(255, 255, 255, 0.08);

    --radius-sm: 8px;
    --radius:    14px;
    --radius-lg: 20px;

    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;
    --space-7: 48px;

    --shadow-1: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-2: 0 12px 40px rgba(0, 0, 0, 0.45);

    --font-sans: 'Inter Variable', 'Inter', -apple-system, BlinkMacSystemFont,
                 'Segoe UI', system-ui, Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: ui-monospace, 'JetBrains Mono', 'Fira Code', Menlo, Consolas, monospace;

    color-scheme: dark;
}

[data-theme="light"] {
    --bg-deep:   #f3f4f6;
    --bg-1:      #ffffff;
    --bg-2:      #f7f8fa;
    --bg-3:      #eceef2;
    --border:    rgba(0, 0, 0, 0.07);
    --border-strong: rgba(0, 0, 0, 0.14);
    --text:      #14171c;
    --muted:     #5a6170;
    --muted-2:   #8a909c;
    --accent:    #4b5da6;
    --accent-dim: #8fa3ff;
    --danger:    #b53939;

    --glass-bg:   rgba(255, 255, 255, 0.72);
    --glass-edge: rgba(0, 0, 0, 0.06);

    color-scheme: light;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.5;
    color: var(--text);
    background: var(--bg-deep);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}
h1, h2, h3, h4 { margin: 0; font-weight: 600; letter-spacing: -0.01em; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
input, button { font-family: inherit; }
img { display: block; max-width: 100%; }

/* ---------- background variants ---------- */
.auth-bg {
    min-height: 100dvh;
    background:
        radial-gradient(60vmax 40vmax at 18% 22%, rgba(143, 163, 255, 0.16), transparent 60%),
        radial-gradient(50vmax 36vmax at 82% 78%, rgba(180, 120, 220, 0.12), transparent 60%),
        radial-gradient(70vmax 50vmax at 50% 110%, rgba(60, 100, 180, 0.22), transparent 60%),
        var(--bg-deep);
    background-attachment: fixed;
}
[data-theme="light"] .auth-bg {
    background:
        radial-gradient(60vmax 40vmax at 18% 22%, rgba(140, 160, 250, 0.20), transparent 60%),
        radial-gradient(50vmax 36vmax at 82% 78%, rgba(220, 180, 240, 0.18), transparent 60%),
        radial-gradient(70vmax 50vmax at 50% 110%, rgba(100, 140, 220, 0.22), transparent 60%),
        var(--bg-deep);
}

.dash-bg {
    min-height: 100dvh;
    background:
        radial-gradient(80vmax 50vmax at 100% 0%, rgba(70, 90, 160, 0.10), transparent 60%),
        radial-gradient(80vmax 50vmax at 0% 100%, rgba(100, 80, 160, 0.08), transparent 60%),
        var(--bg-deep);
    background-attachment: fixed;
}

/* ---------- glass surface ---------- */
.glass {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-edge);
    border-radius: var(--radius);
    box-shadow: var(--shadow-2);
}

/* ---------- shared bits ---------- */
.muted { color: var(--muted); font-size: 13px; }
.err {
    color: var(--danger);
    font-size: 13px;
    margin: 0;
    padding: 8px 10px;
    background: rgba(255, 138, 138, 0.08);
    border: 1px solid rgba(255, 138, 138, 0.22);
    border-radius: var(--radius-sm);
}
.hint { color: var(--muted-2); font-size: 12px; margin-top: 4px; display: block; }
.code {
    font-family: var(--font-mono);
    font-size: 13px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    overflow-x: auto;
    margin: var(--space-3) 0 0;
}

/* ---------- auth layout ---------- */
.auth {
    min-height: 100dvh;
    display: grid;
    place-items: center;
    padding: var(--space-5);
}
.auth-card {
    width: min(420px, 100%);
    padding: var(--space-6) var(--space-6) var(--space-5);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}
.auth-title {
    text-align: center;
    font-size: 36px;
    font-weight: 600;
    letter-spacing: -0.04em;
    margin: var(--space-2) 0 var(--space-4);
    color: var(--text);
}

/* ---------- form ---------- */
.form {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}
.field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.field > span {
    font-size: 12px;
    text-transform: lowercase;
    letter-spacing: 0.04em;
    color: var(--muted);
}
.field input {
    width: 100%;
    padding: 10px 12px;
    background: rgba(0, 0, 0, 0.18);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 15px;
    transition: border-color 120ms ease, background 120ms ease;
}
[data-theme="light"] .field input { background: rgba(0, 0, 0, 0.03); }
.field input:hover { border-color: var(--border-strong); }
.field input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(143, 163, 255, 0.18);
}
.field input:invalid:not(:placeholder-shown) {
    border-color: rgba(255, 138, 138, 0.45);
}

/* ---------- buttons ---------- */
.btn {
    padding: 11px 16px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 0.01em;
    cursor: pointer;
    transition: transform 80ms ease, background 120ms ease, opacity 120ms ease;
}
.btn.primary {
    background: var(--accent);
    color: #0b0d10;
    border: 1px solid var(--accent);
}
.btn.primary:hover { background: #a5b6ff; }
.btn.primary:active { transform: translateY(1px); }

.ghost-btn {
    width: 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    color: var(--muted);
    transition: background 120ms ease, color 120ms ease;
}
.ghost-btn:hover { background: var(--bg-2); color: var(--text); }
.ghost-btn svg { width: 20px; height: 20px; display: block; }

/* ---------- theme toggle ---------- */
.theme-toggle {
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-edge);
    color: var(--text);
    cursor: pointer;
    transition: background 120ms ease, color 120ms ease, transform 120ms ease, border-color 120ms ease;
}
.theme-toggle:hover {
    color: var(--accent);
    transform: scale(1.04);
    border-color: var(--border-strong);
}
.theme-toggle svg { display: block; }

.theme-fab {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 50;
}

.theme-icon-sun, .theme-icon-moon { display: none; }
[data-theme="dark"] .theme-icon-sun { display: block; }
[data-theme="light"] .theme-icon-moon { display: block; }

/* ---------- divider ---------- */
.divider {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    color: var(--muted-2);
    font-size: 12px;
    text-transform: lowercase;
    letter-spacing: 0.06em;
}
.divider::before, .divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--border);
}

/* ---------- alt link ---------- */
.alt {
    align-self: center;
    color: var(--muted);
    font-size: 13px;
    padding: 6px 8px;
    border-radius: var(--radius-sm);
    transition: color 120ms ease, background 120ms ease;
}
.alt:hover { color: var(--text); background: var(--bg-2); }

/* ---------- dashboard top bar ---------- */
.topbar {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-3) var(--space-5);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-edge);
}
.brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: 600;
    letter-spacing: -0.02em;
}
.brand-mark {
    display: inline-block;
    width: 14px;
    height: 14px;
    border-radius: 4px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dim));
}
.brand-name { font-size: 16px; }
.topbar-spacer { flex: 1; }
.userblock {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}
.user-name { color: var(--muted); font-size: 14px; }
.logout-form { margin: 0; display: inline-flex; }

/* ---------- tile grid ---------- */
.dash {
    padding: var(--space-5);
    max-width: 1400px;
    margin: 0 auto;
}
.tile-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--space-4);
}
.tile {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    color: var(--text);
    transition: transform 120ms ease, box-shadow 160ms ease, border-color 120ms ease;
}
.tile:hover {
    transform: translateY(-2px);
    border-color: var(--border-strong);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.55);
}
.tile-art {
    aspect-ratio: 1 / 1;
    background: linear-gradient(135deg, var(--accent-dim), var(--bg-3));
    position: relative;
    overflow: hidden;
}
.tile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.tile-mono {
    position: absolute;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 56px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: rgba(255, 255, 255, 0.85);
    background: linear-gradient(135deg, var(--accent-dim), var(--bg-3));
}
.tile-meta {
    padding: var(--space-3) var(--space-4) var(--space-4);
}
.tile-title {
    font-size: 16px;
    margin: 0 0 2px;
}
.tile-desc {
    font-size: 13px;
    color: var(--muted);
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

/* ---------- empty state ---------- */
.empty {
    margin: 10vh auto 0;
    max-width: 520px;
    padding: var(--space-6);
    text-align: center;
}
.empty h2 { font-size: 18px; margin-bottom: var(--space-2); }

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    .tile:hover { transform: none; }
}

/* ---------- small phones ---------- */
@media (max-width: 480px) {
    .topbar { padding: var(--space-2) var(--space-3); }
    .dash { padding: var(--space-3); }
    .auth { padding: var(--space-3); }
    .auth-card { padding: var(--space-5) var(--space-4); }
    .tile-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
    .tile-mono { font-size: 44px; }
}