/* ──────────────────────────────────────────────
   Base
   ────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:      #0d0d0d;
  --surface: #161616;
  --surface-2: #0a0a0a;
  --border:  #2a2a2a;
  --text:    #d4d4d4;
  --muted:   #555;
  --accent:  #4f8ef7;
  --danger:  #d14;
  --green:   #2e9e60;
  --warn-bg: #110c02;
  --warn-border: #4a3210;
  --warn-text: #b8902a;
  --mine-bg: #1b3460;
  --mine-text: #c8ddf7;
  --header-text: #eee;
  --btn-primary-text: #fff;
  --font:    system-ui, -apple-system, sans-serif;
  --mono:    'Courier New', Courier, monospace;
  --radius:  4px;
}

body[data-theme='light'] {
  --bg:      #f6f8fb;
  --surface: #ffffff;
  --surface-2: #f1f4f8;
  --border:  #d7ddea;
  --text:    #1b2430;
  --muted:   #5f6b7a;
  --accent:  #2d69e0;
  --danger:  #c23939;
  --green:   #1f8b55;
  --warn-bg: #fff8eb;
  --warn-border: #e9d1a1;
  --warn-text: #8e651d;
  --mine-bg: #dce8ff;
  --mine-text: #15356e;
  --header-text: #161c27;
  --btn-primary-text: #ffffff;
}

html { font-size: 15px; }

body {
  background: var(--bg);
  color:      var(--text);
  font-family: var(--font);
  line-height: 1.55;
  min-height:  100dvh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ──────────────────────────────────────────────
   Layout helpers
   ────────────────────────────────────────────── */
.page {
  max-width: 520px;
  margin:    0 auto;
  padding:   3rem 1.25rem 4rem;
}

.page--wide {
  max-width: 780px;
}

/* ──────────────────────────────────────────────
   Typography
   ────────────────────────────────────────────── */
h1 {
  font-size:   1.4rem;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--header-text);
}

h2 {
  font-size:   .9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
  margin-bottom: .9rem;
}

.mono {
  font-family: var(--mono);
  font-size:   .9rem;
  word-break:  break-all;
  letter-spacing: .02em;
}

.label {
  font-size:  .75rem;
  color:      var(--muted);
  text-transform: uppercase;
  letter-spacing: .06em;
}

/* ──────────────────────────────────────────────
   Inputs & Buttons
   ────────────────────────────────────────────── */
input[type="text"],
input[type="number"],
textarea {
  width:      100%;
  background: var(--surface);
  border:     1px solid var(--border);
  color:      var(--text);
  padding:    .55rem .75rem;
  border-radius: var(--radius);
  font:       inherit;
  font-size:  .9rem;
  outline:    none;
  transition: border-color .15s;
}

input:focus,
textarea:focus {
  border-color: var(--accent);
}

.btn {
  display:     inline-flex;
  align-items: center;
  gap:         .4rem;
  cursor:      pointer;
  font:        inherit;
  font-size:   .875rem;
  padding:     .55rem 1.1rem;
  border-radius: var(--radius);
  border:      1px solid transparent;
  transition:  opacity .1s, background .1s;
  white-space: nowrap;
}

.btn:disabled { opacity: .4; cursor: default; }

.btn-primary {
  background: var(--accent);
  color:      var(--btn-primary-text);
}
.btn-primary:hover:not(:disabled) { opacity: .85; }

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover:not(:disabled) { background: var(--surface); }

.btn-danger {
  background: transparent;
  border-color: var(--danger);
  color: var(--danger);
}
.btn-danger:hover:not(:disabled) { background: #1f0505; }

.btn-sm {
  padding:   .3rem .65rem;
  font-size: .8rem;
}

/* ──────────────────────────────────────────────
   Cards / Panels
   ────────────────────────────────────────────── */
.card {
  background:    var(--surface);
  border:        1px solid var(--border);
  border-radius: var(--radius);
  padding:       1.4rem 1.5rem;
}

.card + .card { margin-top: 1.2rem; }

/* ──────────────────────────────────────────────
   Header strip
   ────────────────────────────────────────────── */
.site-header {
  padding:     1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  display:     flex;
  align-items: center;
  gap:         1rem;
  font-size:   .85rem;
  color:       var(--muted);
}

.site-header .logo {
  font-family: var(--mono);
  font-size:   .95rem;
  color:       var(--text);
  font-weight: 700;
}

/* ──────────────────────────────────────────────
   Duration picker
   ────────────────────────────────────────────── */
.duration-grid {
  display:   flex;
  flex-wrap: wrap;
  gap:       .45rem;
  margin-top: .6rem;
}

.dur-btn {
  font-family: var(--mono);
  font-size:   .8rem;
  padding:     .35rem .65rem;
  border:      1px solid var(--border);
  border-radius: var(--radius);
  background:  var(--bg);
  color:       var(--muted);
  cursor:      pointer;
  transition:  all .1s;
  user-select: none;
}

.dur-btn:hover   { border-color: var(--accent); color: var(--accent); }
.dur-btn.active  { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ──────────────────────────────────────────────
   Secret ID display
   ────────────────────────────────────────────── */
.secret-block {
  background:    var(--surface-2);
  border:        1px solid var(--border);
  border-radius: var(--radius);
  padding:       .9rem 1rem;
  margin-top:    .75rem;
  position:      relative;
}

.secret-id {
  font-family: var(--mono);
  font-size:   .9rem;
  color:       var(--accent);
  word-break:  break-all;
  letter-spacing: .05em;
}

.copy-btn-inline {
  position:   absolute;
  top:        .55rem;
  right:      .6rem;
  background: transparent;
  border:     1px solid var(--border);
  color:      var(--muted);
  font:       .7rem var(--mono);
  padding:    .15rem .4rem;
  border-radius: 2px;
  cursor:     pointer;
}
.copy-btn-inline:hover { border-color: var(--accent); color: var(--accent); }
.copy-btn-inline.copied { color: var(--green); border-color: var(--green); }

/* ──────────────────────────────────────────────
   Chat page
   ────────────────────────────────────────────── */
.chat-layout {
  display:        flex;
  flex-direction: column;
  height:         100dvh;
}

.chat-topbar {
  flex-shrink: 0;
  padding:     .6rem 1rem;
  border-bottom: 1px solid var(--border);
  display:     flex;
  align-items: center;
  gap:         1.2rem;
  font-size:   .8rem;
  background:  var(--surface);
}

.chat-topbar .spacer { flex: 1; }

.chat-topbar .meta-item { color: var(--muted); }
.chat-topbar .meta-item strong { color: var(--text); }

.chat-topbar .status-dot {
  width:   7px;
  height:  7px;
  border-radius: 50%;
  background: var(--muted);
  display: inline-block;
  margin-right: .3rem;
}
.chat-topbar .status-dot.live { background: var(--green); }

.chat-messages {
  flex:       1;
  overflow-y: auto;
  padding:    1.2rem 1rem;
  display:    flex;
  flex-direction: column;
  gap:        .1rem;
  scroll-behavior: smooth;
}

.msg-row {
  display:  flex;
  gap:      .5rem;
  max-width: 72%;
  align-items: flex-end;
  margin-bottom: .5rem;
}

.msg-row.mine  { margin-left: auto; flex-direction: row-reverse; }
.msg-row.theirs { margin-right: auto; }

.msg-bubble {
  padding:       .45rem .75rem;
  border-radius: var(--radius);
  font-size:     .9rem;
  line-height:   1.45;
  word-break:    break-word;
  white-space:   pre-wrap;
}

.mine  .msg-bubble { background: var(--mine-bg); color: var(--mine-text); }
.theirs .msg-bubble { background: var(--surface); border: 1px solid var(--border); color: var(--text); }

.msg-time {
  font-size:  .68rem;
  color:      var(--muted);
  white-space: nowrap;
  margin-bottom: .15rem;
}

/* System messages */
.msg-system {
  text-align:  center;
  font-size:   .75rem;
  color:       var(--muted);
  padding:     .3rem 0;
  font-family: var(--mono);
}

/* Typing indicator */
.typing-indicator {
  font-size:  .78rem;
  color:      var(--muted);
  font-style: italic;
  padding:    .2rem 1rem;
  min-height: 1.4rem;
  flex-shrink: 0;
}

.chat-composer {
  flex-shrink: 0;
  padding:     .7rem 1rem;
  border-top:  1px solid var(--border);
  background:  var(--surface);
  display:     flex;
  gap:         .5rem;
  align-items: flex-end;
}

.chat-composer textarea {
  flex:       1;
  resize:     none;
  max-height: 140px;
  min-height: 40px;
  border-radius: var(--radius);
  padding:    .5rem .7rem;
  font-size:  .9rem;
}

/* ──────────────────────────────────────────────
   Alerts / notices
   ────────────────────────────────────────────── */
.notice {
  font-size:   .8rem;
  color:       var(--muted);
  border-left: 2px solid var(--border);
  padding-left: .75rem;
  line-height: 1.5;
}

.notice.warn { border-color: #a07030; color: #b8902a; }
.notice.ok   { border-color: var(--green); color: var(--green); }

/* ──────────────────────────────────────────────
   Overlay / modal (session-ended etc.)
   ────────────────────────────────────────────── */
.overlay {
  position:   fixed;
  inset:      0;
  background: rgba(0,0,0,.75);
  display:    flex;
  align-items: center;
  justify-content: center;
  z-index:    999;
}
.overlay-box {
  background: var(--surface);
  border:     1px solid var(--border);
  border-radius: var(--radius);
  padding:    2rem;
  max-width:  360px;
  width:      90%;
  text-align: center;
}
.overlay-box h3 { margin-bottom: .75rem; color: #eee; }
.overlay-box p  { font-size: .85rem; color: var(--muted); margin-bottom: 1.2rem; }

.hidden { display: none !important; }

/* ──────────────────────────────────────────────
   Utility
   ────────────────────────────────────────────── */
.mt-sm  { margin-top: .6rem; }
.mt-md  { margin-top: 1.2rem; }
.mt-lg  { margin-top: 2rem; }
.gap-xs { gap: .4rem; }
.row    { display: flex; align-items: center; }
.row.between { justify-content: space-between; }

/* ──────────────────────────────────────────────
   Theme toggle
   ────────────────────────────────────────────── */
.theme-toggle {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  border-radius: var(--radius);
  padding: .32rem .58rem;
  font: .76rem var(--mono);
  cursor: pointer;
}

.theme-toggle:hover { background: var(--surface); }

/* ──────────────────────────────────────────────
   Home layout/nav
   ────────────────────────────────────────────── */
.home-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: calc(100dvh - 56px);
}

.home-sidebar {
  border-right: 1px solid var(--border);
  padding: 1rem;
  background: var(--surface);
}

.home-main {
  padding: 1.2rem;
}

.nav-group + .nav-group { margin-top: .8rem; }

.nav-group summary {
  list-style: none;
  cursor: pointer;
  font-size: .78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .07em;
  padding: .45rem .55rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
}

.nav-group summary::-webkit-details-marker { display: none; }

.nav-links {
  margin-top: .5rem;
  display: grid;
  gap: .45rem;
}

.nav-links a {
  display: block;
  padding: .5rem .6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  font-size: .88rem;
}

.nav-links a:hover {
  border-color: var(--accent);
  text-decoration: none;
}

.home-hero {
  display: grid;
  gap: 1rem;
}

.home-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.warn-box {
  border: 1px solid var(--warn-border);
  background: var(--warn-bg);
  border-radius: var(--radius);
  padding: .65rem .85rem;
  font-size: .8rem;
  color: var(--warn-text);
  margin-top: .85rem;
  line-height: 1.5;
}

/* ──────────────────────────────────────────────
   Responsive
   ────────────────────────────────────────────── */
@media (max-width: 980px) {
  .home-shell {
    grid-template-columns: 1fr;
  }

  .home-sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .home-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .site-header {
    flex-wrap: wrap;
    row-gap: .5rem;
  }

  .page {
    padding: 1.2rem .9rem 1.8rem;
  }

  .card {
    padding: 1rem;
  }

  .chat-topbar {
    flex-wrap: wrap;
    gap: .55rem;
  }

  .chat-topbar .spacer {
    display: none;
  }

  .msg-row {
    max-width: 88%;
  }

  .chat-composer {
    padding: .6rem .7rem;
  }
}