/* most — a calm, modern, trustworthy 1:1 calling app.
 *
 * Refined light theme (dark text on light): legible for everyone, easy for an
 * elderly user, but sized by good design rather than accessibility-maximalism.
 * Emerald primary, neutral slate surfaces, soft depth. The video area alone is
 * black. Body/heading text is WCAG AAA; every control meets AA. Spacing follows
 * a 4/8px scale.
 */

* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* surfaces */
  --surface: #ffffff;
  --bg-top: #fbfcfd;
  --bg-bot: #eaeef3;

  /* ink */
  --text: #0f172a;   /* slate-900 */
  --lead: #475569;   /* slate-600 — AAA on white */
  --muted: #64748b;  /* slate-500 — AA on white */
  --line: #e2e8f0;   /* slate-200 hairline */
  --line-2: #eef2f6;

  /* brand + state */
  --primary: #047857;         /* emerald-700 */
  --primary-hover: #065f46;   /* emerald-800 */
  --primary-active: #064e3b;  /* emerald-900 */
  --primary-soft: #ecfdf5;    /* emerald-50 */
  --primary-ring: rgba(4, 120, 87, 0.28);
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --accent: #0369a1;

  --info-bg: #eff6ff; --info-tx: #1e40af; --info-dot: #2563eb;
  --warn-bg: #fffbeb; --warn-tx: #92400e; --warn-dot: #d97706;
  --good-bg: #ecfdf5; --good-tx: #065f46; --good-dot: #059669;

  --focus: #2563eb;
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 22px;
  --shadow-card: 0 1px 2px rgba(15, 23, 42, 0.04), 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-primary: 0 2px 6px rgba(4, 120, 87, 0.18);
  --shadow-badge: 0 5px 14px rgba(4, 120, 87, 0.22);
}

html, body { height: 100%; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bot) 100%);
  background-attachment: fixed;
  font-size: 17px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}

.hidden { display: none !important; }

/* ---------- card screens (home / join / ended) ---------- */

.screen {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.card {
  position: relative;
  width: 100%;
  max-width: 416px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-card);
  padding: 32px 28px;
  text-align: center;
}

/* Brand mark — small identity badge, also pushes the title clear of the
   top-right language toggle so no title ever collides with it. */
.brand {
  width: 56px;
  height: 56px;
  margin: 4px auto 18px;
  border-radius: 17px;
  display: grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(160deg, #059669 0%, #047857 60%, #065f46 100%);
  box-shadow: var(--shadow-badge);
}
.brand .ic { stroke-width: 2; }
.brand-ended {
  background: linear-gradient(160deg, #94a3b8 0%, #64748b 100%);
  box-shadow: 0 5px 14px rgba(100, 116, 139, 0.22);
}

h1 {
  font-size: 25px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.25;
  margin-bottom: 8px;
}

.lead {
  color: var(--lead);
  font-size: 16px;
  line-height: 1.55;
  margin: 0 auto 24px;
  max-width: 34ch;
}

.step {
  font-size: 15px;
  font-weight: 600;
  color: var(--lead);
  margin: 4px 0 10px;
}

.note {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
  margin-top: 12px;
}

/* Privacy reassurance line under the primary action on Home. */
.trust {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line-2);
  color: var(--muted);
  font-size: 13.5px;
}
.trust .ic { color: var(--primary); stroke-width: 2; }

/* ---------- buttons ---------- */

button { font: inherit; cursor: pointer; border: none; background: none; }
button:disabled { cursor: not-allowed; }

/* Primary + secondary full-width actions on the card screens. */
.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  min-height: 52px;
  padding: 13px 20px;
  margin-top: 12px;
  font-size: 18px;
  font-weight: 600;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  transition: background-color .15s ease, box-shadow .15s ease, transform .05s ease;
}
.btn .ic { width: 22px; height: 22px; flex: none; }

/* secondary (neutral) */
.btn {
  background: var(--surface);
  border-color: var(--line);
  color: var(--text);
}
.btn:hover { background: #f8fafc; border-color: #cbd5e1; }
.btn:active { transform: translateY(1px); }

/* primary (emerald) */
.btn.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-primary);
}
.btn.primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn.primary:active { background: var(--primary-active); }
.btn.primary:disabled { background: #94a3b8; border-color: #94a3b8; box-shadow: none; opacity: .8; }

/* First primary action needs a touch more separation from the lead text. */
#btn-create, #btn-join { margin-top: 4px; }

/* Language toggle — quiet ghost pill, top-right. */
.lang {
  position: absolute;
  top: 16px;
  right: 16px;
  min-width: 44px;
  height: 34px;
  padding: 0 12px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--primary);
  background: var(--primary-soft);
  border-radius: 999px;
  transition: background-color .15s ease;
}
.lang:hover { background: #d1fae5; }

/* Focus: crisp ring with a white gap so it reads on any surface. */
:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  box-shadow: 0 0 0 2px #fff;
}
.btn:focus-visible, .lang:focus-visible { outline-offset: 3px; }
input:focus-visible { outline-offset: 0; box-shadow: none; }

.linkbox {
  margin: 2px 0;
  padding: 14px 16px;
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  font-size: 15px;
  line-height: 1.45;
  color: var(--text);
  word-break: break-all;
  user-select: all;
}

.checkline {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  justify-content: center;
  margin-top: 16px;
  padding: 10px 14px;
  border-radius: var(--r-md);
  background: #f8fafc;
  border: 1px solid var(--line);
  font-size: 16px;
  color: var(--text);
  cursor: pointer;
}
.checkline input { width: 22px; height: 22px; accent-color: var(--primary); cursor: pointer; }

/* ---------- call screen ---------- */

#screen-call {
  flex-direction: column;
  padding: 0;
  align-items: stretch;
  justify-content: flex-start;
  background: #0b0f14;
}

/* Plain-language connection status; a coloured dot reinforces the state. */
.banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 16px;
  text-align: center;
  font-size: 15px;
  font-weight: 600;
}
.banner::before {
  content: "";
  width: 10px; height: 10px;
  border-radius: 50%;
  flex: none;
}
.banner.info { background: var(--info-bg); color: var(--info-tx); }
.banner.info::before { background: var(--info-dot); }
.banner.warn { background: var(--warn-bg); color: var(--warn-tx); }
.banner.warn::before { background: var(--warn-dot); }
.banner.good { background: var(--good-bg); color: var(--good-tx); }
.banner.good::before { background: var(--good-dot); box-shadow: 0 0 0 4px rgba(5, 150, 105, 0.18); }

#videos {
  position: relative;
  flex: 1;
  min-height: 0;
  background: #000;
}

#remote-video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
}

#local-video {
  position: absolute;
  right: 14px;
  bottom: 14px;
  width: 27%;
  max-width: 172px;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 12px;
  border: 2px solid rgba(255, 255, 255, 0.85);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.45);
  background: #111;
}

.placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #cbd5e1;
  font-size: 18px;
  text-align: center;
  padding: 24px;
}

.tap-to-start {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.72);
  color: #fff;
  font-size: 20px;
  font-weight: 600;
  text-align: center;
  padding: 24px;
}

/* ---------- chat ---------- */

#chat {
  display: flex;
  flex-direction: column;
  height: 40dvh;
  background: var(--surface);
  border-top: 1px solid var(--line);
}

#chat-log {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.msg {
  max-width: 80%;
  padding: 10px 14px;
  border-radius: 16px;
  background: #f1f5f9;
  color: var(--text);
  font-size: 16px;
  line-height: 1.45;
  word-wrap: break-word;
  align-self: flex-start;
  border-bottom-left-radius: 6px;
}
.msg.mine {
  background: #d1fae5;
  align-self: flex-end;
  border-bottom-left-radius: 16px;
  border-bottom-right-radius: 6px;
}
.msg img { max-width: 100%; border-radius: 10px; display: block; margin-top: 6px; }
.msg a { color: var(--accent); font-weight: 600; }
.msg .sys { color: var(--muted); font-size: 14px; }

#chat-input-row {
  display: flex;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding-bottom: max(12px, env(safe-area-inset-bottom));
}

#chat-text {
  flex: 1;
  font: inherit;
  font-size: 16px;
  padding: 12px 15px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #f8fafc;
  color: var(--text);
}
#chat-text::placeholder { color: var(--muted); }
#chat-text:focus { border-color: var(--primary); background: #fff; }

#chat-input-row button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px; height: 48px;
  flex: none;
  border-radius: 50%;
  color: var(--lead);
  background: #f1f5f9;
  transition: background-color .15s ease;
}
#btn-attach:hover { background: #e2e8f0; }
#btn-send { background: var(--primary); color: #fff; box-shadow: var(--shadow-primary); }
#btn-send:hover { background: var(--primary-hover); }
#chat-input-row .ic { width: 22px; height: 22px; }

/* ---------- controls ---------- */

#controls {
  display: flex;
  gap: 10px;
  padding: 12px 12px max(12px, env(safe-area-inset-bottom));
  justify-content: center;
  background: var(--surface);
  border-top: 1px solid var(--line);
}

.ctl {
  flex: 1;
  max-width: 132px;
  min-height: 58px;
  padding: 8px 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  border-radius: var(--r-md);
  background: #f1f5f9;
  color: var(--lead);
  font-size: 13px;
  font-weight: 600;
  transition: background-color .15s ease, color .15s ease;
}
.ctl:hover { background: #e2e8f0; }
.ctl:active { transform: translateY(1px); }
.ctl .ic { width: 24px; height: 24px; }

/* mic/camera muted — clear amber state, not just a tint. */
.ctl.off { background: #fef3c7; color: #92400e; }
.ctl.off:hover { background: #fde68a; }

.ctl.danger { background: var(--danger); color: #fff; }
.ctl.danger:hover { background: var(--danger-hover); }

.i-hangup { transform: rotate(135deg); }

/* Shared line-icon rendering. */
.ic {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---------- desktop ---------- */

@media (min-width: 800px) {
  #screen-call { flex-direction: row; flex-wrap: wrap; }
  #banner { width: 100%; order: 0; }
  #videos { order: 1; flex: 1 1 60%; height: calc(100dvh - 150px); }
  #chat {
    order: 2; flex: 0 0 372px;
    height: calc(100dvh - 150px);
    border-top: none; border-left: 1px solid var(--line);
  }
  #controls { order: 3; width: 100%; gap: 12px; }
  .ctl { max-width: 150px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
  button:active { transform: none; }
}