/* ==========================================================================
   Rethink! EAM 2026 — Vortragsportal · Design System
   100% offline: system fonts, no external assets. Light + dark themes.
   ========================================================================== */

/* ---- Tokens -------------------------------------------------------------- */
:root {
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  /* spacing scale (4px base) */
  --s1: 0.25rem; --s2: 0.5rem; --s3: 0.75rem; --s4: 1rem;
  --s5: 1.5rem; --s6: 2rem; --s7: 3rem; --s8: 4rem;

  --r-sm: 8px; --r-md: 12px; --r-lg: 18px; --r-xl: 26px; --r-pill: 999px;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --dur: 180ms;

  --maxw: 1240px;
}

/* dark (default) */
:root, :root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #070b14;
  --bg-grad-a: #0a1120;
  --bg-grad-b: #06080f;
  --surface: #101827;
  --surface-2: #16203300;
  --card: #0f1826;
  --card-hover: #131f31;
  --elevated: #17233a;
  --text: #eef3fb;
  --text-soft: #c3cee0;
  --muted: #8595b0;
  --faint: #5d6a83;
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --accent: #5b9dff;
  --accent-2: #a480ff;
  --accent-ink: #06101f;
  --video: #ff6b8b;
  --video-bg: rgba(255, 107, 139, 0.14);
  --ok: #46d6a6;
  --shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.7);
  --shadow-sm: 0 4px 14px -6px rgba(0, 0, 0, 0.6);
  --ring: 0 0 0 3px rgba(91, 157, 255, 0.4);
  --glow: radial-gradient(60% 90% at 15% 0%, rgba(91,157,255,0.18), transparent 60%),
          radial-gradient(50% 80% at 90% 0%, rgba(164,128,255,0.14), transparent 55%);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f6fb;
  --bg-grad-a: #eef2fb;
  --bg-grad-b: #f7f9fe;
  --surface: #ffffff;
  --card: #ffffff;
  --card-hover: #ffffff;
  --elevated: #ffffff;
  --text: #10192b;
  --text-soft: #29344a;
  --muted: #5a6784;
  --faint: #8592ab;
  --border: rgba(16, 25, 43, 0.10);
  --border-strong: rgba(16, 25, 43, 0.18);
  --accent: #2f6bff;
  --accent-2: #7b4dff;
  --accent-ink: #ffffff;
  --video: #e23c62;
  --video-bg: rgba(226, 60, 98, 0.10);
  --ok: #0f9d70;
  --shadow: 0 22px 50px -24px rgba(20, 40, 90, 0.35);
  --shadow-sm: 0 6px 18px -10px rgba(20, 40, 90, 0.25);
  --ring: 0 0 0 3px rgba(47, 107, 255, 0.28);
  --glow: radial-gradient(60% 90% at 15% 0%, rgba(47,107,255,0.10), transparent 60%),
          radial-gradient(50% 80% at 90% 0%, rgba(123,77,255,0.08), transparent 55%);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  background-image: linear-gradient(180deg, var(--bg-grad-a), var(--bg-grad-b) 60%);
  background-attachment: fixed;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: none; box-shadow: var(--ring); border-radius: var(--r-sm); }
.container { width: min(var(--maxw), calc(100% - 2.5rem)); margin-inline: auto; }

.skip {
  position: fixed; left: 50%; top: -60px; transform: translateX(-50%);
  background: var(--accent); color: var(--accent-ink); padding: 0.6rem 1rem;
  border-radius: var(--r-pill); z-index: 100; transition: top var(--dur) var(--ease);
}
.skip:focus { top: 12px; text-decoration: none; }

/* ---- Top bar ------------------------------------------------------------- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  backdrop-filter: saturate(160%) blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--border);
}
.topbar-inner { display: flex; align-items: center; gap: var(--s4); padding: 0.7rem 0; }
.brand { display: flex; align-items: center; gap: var(--s3); font-weight: 800; letter-spacing: -0.01em; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 9px; flex: 0 0 auto;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: var(--shadow-sm);
  display: grid; place-items: center; color: var(--accent-ink); font-size: 15px;
}
.brand small { display: block; font-weight: 600; color: var(--muted); font-size: 0.72rem; letter-spacing: 0.02em; }
.topbar-actions { margin-left: auto; display: flex; align-items: center; gap: var(--s2); }

.iconbtn, .ghost {
  font: inherit; cursor: pointer; border: 1px solid var(--border);
  background: var(--surface); color: var(--text-soft);
  border-radius: var(--r-pill); padding: 0.5rem 0.9rem; font-size: 0.86rem; font-weight: 600;
  display: inline-flex; align-items: center; gap: 0.45rem;
  transition: transform var(--dur) var(--ease), background var(--dur), border-color var(--dur), color var(--dur);
}
.iconbtn { padding: 0.5rem; width: 38px; height: 38px; justify-content: center; }
.ghost:hover, .iconbtn:hover { border-color: var(--border-strong); background: var(--card-hover); transform: translateY(-1px); }
.ghost:active, .iconbtn:active { transform: translateY(0); }
.theme-toggle .sun { display: none; }
:root[data-theme="light"] .theme-toggle .sun { display: inline; }
:root[data-theme="light"] .theme-toggle .moon { display: none; }
@media (max-width: 620px) { .ghost .lbl { display: none; } .ghost { padding: 0.5rem; width: 38px; justify-content: center; } }

/* ---- Hero ---------------------------------------------------------------- */
.hero { position: relative; padding: clamp(2.5rem, 6vw, 4.5rem) 0 var(--s6); overflow: hidden; }
.hero::before { content: ""; position: absolute; inset: 0; background: var(--glow); pointer-events: none; }
.hero > .container { position: relative; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  text-transform: uppercase; letter-spacing: 0.22em; font-size: 0.74rem; font-weight: 800;
  color: var(--accent);
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: currentColor; border-radius: 2px; }
h1 {
  font-size: clamp(2.1rem, 5.5vw, 3.6rem); line-height: 1.03; letter-spacing: -0.025em;
  margin: 0.7rem 0 0.6rem; font-weight: 820;
  background: linear-gradient(180deg, var(--text), color-mix(in srgb, var(--text) 62%, var(--muted)));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead { max-width: 60ch; color: var(--muted); font-size: 1.06rem; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 0.5rem 1.1rem; margin-top: var(--s4); color: var(--text-soft); font-size: 0.92rem; }
.hero-meta span { display: inline-flex; align-items: center; gap: 0.4rem; }
.hero-meta .dot { color: var(--faint); }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: var(--s3); margin-top: var(--s5); }
.stat {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: 0.9rem 1.05rem; box-shadow: var(--shadow-sm); position: relative; overflow: hidden;
}
.stat b { display: block; font-size: 1.7rem; font-weight: 800; letter-spacing: -0.02em; line-height: 1.1; }
.stat span { color: var(--muted); font-size: 0.85rem; font-weight: 600; }
.stat .spark { position: absolute; right: -6px; top: -6px; font-size: 2.6rem; opacity: 0.12; }

/* ---- Filter bar ---------------------------------------------------------- */
.filterbar {
  position: sticky; top: 55px; z-index: 30; margin-top: var(--s5);
  backdrop-filter: saturate(150%) blur(12px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
}
.filterbar-inner { display: flex; flex-direction: column; gap: var(--s3); padding: var(--s4) 0; }
.filter-row { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s3); }
.search { position: relative; flex: 1 1 320px; min-width: 220px; }
.search svg { position: absolute; left: 0.85rem; top: 50%; transform: translateY(-50%); color: var(--faint); pointer-events: none; }
.search input {
  width: 100%; font: inherit; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--r-pill);
  padding: 0.72rem 2.4rem 0.72rem 2.5rem; transition: border-color var(--dur), box-shadow var(--dur);
}
.search input::placeholder { color: var(--faint); }
.search input:focus { border-color: var(--accent); }
.search .clear-search {
  position: absolute; right: 0.5rem; top: 50%; transform: translateY(-50%);
  border: 0; background: var(--elevated); color: var(--muted); cursor: pointer;
  width: 26px; height: 26px; border-radius: 50%; display: none; align-items: center; justify-content: center;
}
.search.has-value .clear-search { display: inline-flex; }

.segmented { display: inline-flex; background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-pill); padding: 3px; gap: 2px; }
.segmented button {
  font: inherit; font-size: 0.85rem; font-weight: 650; cursor: pointer; border: 0; background: transparent;
  color: var(--muted); padding: 0.42rem 0.9rem; border-radius: var(--r-pill); white-space: nowrap;
  transition: color var(--dur), background var(--dur);
}
.segmented button:hover { color: var(--text); }
.segmented button[aria-pressed="true"] { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: var(--accent-ink); }

.chips { display: flex; flex-wrap: wrap; gap: var(--s2); }
.chip {
  font: inherit; font-size: 0.82rem; font-weight: 640; cursor: pointer;
  border: 1px solid var(--border); background: var(--surface); color: var(--text-soft);
  border-radius: var(--r-pill); padding: 0.4rem 0.85rem; display: inline-flex; align-items: center; gap: 0.4rem;
  transition: transform var(--dur) var(--ease), border-color var(--dur), background var(--dur), color var(--dur);
}
.chip:hover { transform: translateY(-1px); border-color: var(--border-strong); }
.chip[aria-pressed="true"] { background: color-mix(in srgb, var(--accent) 18%, transparent); border-color: color-mix(in srgb, var(--accent) 55%, transparent); color: var(--text); }
.chip .count { color: var(--faint); font-variant-numeric: tabular-nums; font-weight: 600; }
.chip[aria-pressed="true"] .count { color: var(--accent); }
.chip.chip-video[aria-pressed="true"] { background: var(--video-bg); border-color: color-mix(in srgb, var(--video) 55%, transparent); color: var(--video); }

.filter-meta { display: flex; align-items: center; gap: var(--s3); margin-left: auto; color: var(--muted); font-size: 0.86rem; }
.filter-meta b { color: var(--text); font-variant-numeric: tabular-nums; }
.reset { font: inherit; font-size: 0.84rem; font-weight: 650; color: var(--accent); background: none; border: 0; cursor: pointer; padding: 0.3rem 0.2rem; }
.reset[hidden] { display: none; }

/* ---- Grid + cards -------------------------------------------------------- */
main { padding-block: var(--s6) var(--s8); }
.grid { display: grid; gap: var(--s4); grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); }

.card {
  position: relative; display: flex; flex-direction: column;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--r-xl);
  padding: var(--s4); box-shadow: var(--shadow-sm);
  transition: transform var(--dur) var(--ease), border-color var(--dur), box-shadow var(--dur), background var(--dur);
  animation: rise var(--dur) var(--ease) both;
}
.card:hover { transform: translateY(-3px); border-color: var(--border-strong); box-shadow: var(--shadow); background: var(--card-hover); }
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

.card-top { display: flex; align-items: center; gap: var(--s2); margin-bottom: var(--s3); flex-wrap: wrap; }
.badge {
  font-size: 0.68rem; font-weight: 800; letter-spacing: 0.06em; text-transform: uppercase;
  padding: 0.32rem 0.6rem; border-radius: var(--r-pill);
  background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--accent);
}
.badge-video { background: var(--video-bg); color: var(--video); display: inline-flex; align-items: center; gap: 0.3rem; }
.card-date { margin-left: auto; color: var(--muted); font-size: 0.8rem; font-weight: 600; white-space: nowrap; }

.card-meta { color: var(--muted); font-size: 0.86rem; display: flex; flex-wrap: wrap; gap: 0.15rem 0.55rem; }
.card-meta .sep { color: var(--faint); }
.title { font-size: 1.12rem; line-height: 1.28; font-weight: 750; letter-spacing: -0.01em; margin: 0.5rem 0 0.4rem; }

.video-embed {
  margin: var(--s2) 0 var(--s1); border-radius: var(--r-md); overflow: hidden;
  border: 1px solid var(--border); background: #000; position: relative;
}
.video-embed video, .video-embed iframe { width: 100%; aspect-ratio: 16 / 9; display: block; border: 0; }

.description { color: var(--text-soft); font-size: 0.92rem; margin: 0.3rem 0 0; }
.description.clamp { display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden; }
.more-btn {
  font: inherit; font-size: 0.82rem; font-weight: 650; color: var(--accent); background: none; border: 0;
  cursor: pointer; padding: 0.3rem 0; margin-top: 0.15rem;
}

.speakers { margin-top: var(--s3); display: grid; gap: var(--s2); }
.speaker-chip { display: flex; align-items: center; gap: 0.6rem; }
.avatar {
  width: 40px; height: 40px; border-radius: 50%; object-fit: cover; flex: 0 0 auto;
  border: 1px solid var(--border-strong); background: var(--elevated);
}
.avatar-fallback { display: grid; place-items: center; font-weight: 800; color: var(--accent-ink);
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); font-size: 0.85rem; }
.speaker-name { font-weight: 680; font-size: 0.92rem; }
.speaker-role { color: var(--muted); font-size: 0.82rem; }

.card-foot { margin-top: auto; padding-top: var(--s3); display: flex; flex-wrap: wrap; gap: var(--s2); }
.attach {
  display: inline-flex; align-items: center; gap: 0.38rem; font-size: 0.79rem; font-weight: 640;
  padding: 0.4rem 0.7rem; border-radius: var(--r-pill);
  background: var(--surface); border: 1px solid var(--border); color: var(--text-soft);
  transition: transform var(--dur) var(--ease), border-color var(--dur), color var(--dur), background var(--dur);
}
.attach:hover { transform: translateY(-1px); text-decoration: none; border-color: var(--border-strong); color: var(--text); }
.attach.is-video { color: var(--video); border-color: color-mix(in srgb, var(--video) 40%, transparent); background: var(--video-bg); }
.attach.is-doc { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 35%, transparent); }
.attach .ic { font-size: 0.9em; }

/* empty state */
.empty {
  grid-column: 1 / -1; text-align: center; padding: var(--s8) var(--s4); color: var(--muted);
}
.empty .big { font-size: 2.6rem; margin-bottom: 0.4rem; }
.empty h3 { color: var(--text); font-size: 1.15rem; margin: 0 0 0.3rem; }

/* footer */
.site-foot { border-top: 1px solid var(--border); padding: var(--s6) 0 var(--s7); color: var(--muted); font-size: 0.86rem; }
.site-foot a { font-weight: 600; }
.foot-grid { display: flex; flex-wrap: wrap; gap: var(--s5); justify-content: space-between; }
.foot-badge { display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 700; color: var(--text-soft); }
.foot-badge .pulse { width: 8px; height: 8px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 0 color-mix(in srgb, var(--ok) 70%, transparent); animation: pulse 2.4s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--ok) 55%, transparent); } 70% { box-shadow: 0 0 0 9px transparent; } 100% { box-shadow: 0 0 0 0 transparent; } }

@media (max-width: 640px) {
  .grid { grid-template-columns: 1fr; }
  .filterbar { top: 0; }
  .filter-meta { width: 100%; margin-left: 0; }
}