/* ==========================================================================
   theme.css — shared design system for every page.
   Page-specific rules live in home.css / blog.css / post.css.
   ========================================================================== */

:root {
    color-scheme: dark;
    --bg: #08080b;
    --surface: rgba(255, 255, 255, 0.028);
    --surface-2: rgba(255, 255, 255, 0.05);
    --border: rgba(255, 255, 255, 0.08);
    --border-hi: rgba(255, 255, 255, 0.18);
    --ink: #f4f4f7;
    --ink-dim: #9a9aa8;
    --ink-dimmer: #6a6a78;
    --violet: #a78bff;
    --cyan: #22d3ee;
    --mint: #34d399;
    --grad: linear-gradient(120deg, #a78bff 0%, #22d3ee 55%, #34d399 100%);
    --radius: 26px;
}

:root[data-theme="light"] {
    color-scheme: light;
    --bg: #eceef4;
    --surface: rgba(255, 255, 255, 0.72);
    --surface-2: rgba(17, 17, 22, 0.045);
    --border: rgba(17, 17, 22, 0.18);
    --border-hi: rgba(17, 17, 22, 0.32);
    --ink: #14141a;
    --ink-dim: #53535f;
    --ink-dimmer: #86868f;
    --violet: #6d4bff;
    --cyan: #0e8ba3;
    --mint: #0f9d6a;
    --grad: linear-gradient(120deg, #7c4dff 0%, #0891b2 55%, #059669 100%);
}

:root[data-theme="light"] .aurora span { opacity: 0.32; mix-blend-mode: normal; filter: blur(110px); }
:root[data-theme="light"] h1 { color: #2a2170; }
:root[data-theme="light"] .meta { color: var(--cyan); }
:root[data-theme="light"] .tag { color: var(--violet); }
:root[data-theme="light"] .tooltip { background: #ffffff; box-shadow: 0 8px 24px rgba(17,17,22,0.15); }

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--ink);
    min-height: 100vh;
    padding: clamp(20px, 4vw, 56px);
    position: relative;
    overflow-x: hidden;
}

/* --- Animated aurora background (blob sizes/positions are per-page) --- */
.aurora {
    position: fixed;
    inset: 0;
    z-index: -2;
    overflow: hidden;
    pointer-events: none;
}
.aurora span {
    position: absolute;
    display: block;
    border-radius: 50%;
    filter: blur(90px);
    opacity: 0.5;
    mix-blend-mode: screen;
}

/* --- Grain overlay --- */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    opacity: 0.04;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* --- Theme toggle --- */
.theme-toggle {
    position: fixed;
    top: clamp(16px, 3vw, 28px);
    right: clamp(16px, 3vw, 28px);
    z-index: 60;
    width: 46px; height: 46px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 14px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--ink);
    cursor: pointer;
    font-size: 1.3rem;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: transform 0.25s ease, border-color 0.2s ease, background 0.2s ease;
}
.theme-toggle:hover { transform: translateY(-2px) rotate(-12deg); border-color: var(--border-hi); }

/* --- Gradient text --- */
.grad {
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* --- Eyebrow label (line variant + pill variant) --- */
.eyebrow {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--cyan);
    display: flex;
    align-items: center;
    gap: 10px;
}
.eyebrow::before {
    content: '';
    width: 26px; height: 1px;
    background: linear-gradient(90deg, var(--cyan), transparent);
}
.eyebrow--pill {
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    padding: 7px 12px;
    border-radius: 999px;
    border: 1px solid var(--border);
    display: inline-flex;
    gap: 8px;
}
.eyebrow--pill::before { content: none; }

/* --- Buttons --- */
.btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 22px;
    border-radius: 14px;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    color: var(--ink);
    transition: transform 0.2s ease, box-shadow 0.3s ease, border-color 0.2s ease, background 0.3s ease;
}
.btn ion-icon { font-size: 1.1rem; }
.btn-primary { color: #07070a; background: var(--grad); background-size: 160% 160%; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px -8px rgba(139,123,255,0.55); }
.btn-ghost {
    background: var(--surface-2);
    border: 1px solid var(--border);
}
.btn-ghost:hover { transform: translateY(-2px); border-color: var(--border-hi); }
.btn-sm { padding: 11px 18px; border-radius: 12px; font-size: 0.9rem; }

.tooltip {
    position: absolute;
    bottom: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%) translateY(4px);
    background: #16161d;
    border: 1px solid var(--border-hi);
    color: var(--ink);
    padding: 7px 12px;
    border-radius: 9px;
    font-size: 0.78rem;
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.btn:hover .tooltip { opacity: 1; transform: translateX(-50%) translateY(0); }

/* --- Meta rows (calendar / location / read time) --- */
.meta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.84rem;
    color: var(--ink-dim);
}
.meta span { display: inline-flex; align-items: center; gap: 6px; }

/* --- Tag pills --- */
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tags--lg { gap: 10px; margin-top: 6px; }
.tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.74rem;
    padding: 5px 11px;
    border-radius: 8px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--ink);
}
.tag--lg { font-size: 0.82rem; padding: 8px 13px; border-radius: 10px; }

/* --- Lift card: entrance rise + gradient border on hover ---
   Give an element .lift-card alongside its page class (.card, .post). */
.lift-card {
    position: relative;
    opacity: 0;
    transform: translateY(18px);
    animation: rise 0.7s cubic-bezier(.2,.8,.2,1) forwards;
}
@keyframes rise { to { opacity: 1; transform: translateY(0); } }
.lift-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: var(--grad);
    -webkit-mask: linear-gradient(#000, #000) content-box, linear-gradient(#000, #000);
    -webkit-mask-composite: xor;
    mask: linear-gradient(#000, #000) content-box, linear-gradient(#000, #000);
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.35s ease;
    pointer-events: none;
    z-index: 2;
}
.lift-card:hover { border-color: transparent; }
.lift-card:hover::before { opacity: 0.9; }

/* --- Scroll reveal (activated by post.js) --- */
.reveal {
    opacity: 0;
    transform: translateY(22px);
    transition: opacity 0.7s ease, transform 0.7s cubic-bezier(.2,.8,.2,1);
}
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation: none !important; transition: none !important; }
    .lift-card, .reveal { opacity: 1; transform: none; }
}