/* css/style.css */
/* ════════════════════════════════════════════════════════════════
   نظام التصميم: "Ultra-Modern" — Glassmorphism + Cyber-Minimalism
   مُستخرج ومُكيَّف من تصاميم Stitch المرجعية (Sign In Pro, Live Voice,
   Grammar Arena). توكنات الألوان والخطوط والمسافات مطابقة لملف
   DESIGN.md الأصلي.
   ════════════════════════════════════════════════════════════════ */

:root {
  --obsidian: #0a0f18;
  --bg: #0a0f18;
  --surface-lowest: #0b0e15;
  --surface-low: #10131a;
  --surface: #1d2027;
  --surface-high: #272a31;
  --surface-highest: #32353c;

  --on-surface: #e1e2ec;
  --on-surface-variant: #c2c6d6;
  --outline: #8c909f;
  --outline-variant: #424754;

  --primary: #3b82f6;
  --primary-dim: #2563eb;
  --primary-glow: rgba(59, 130, 246, 0.4);
  --primary-soft: #adc6ff;

  --tertiary: #ffb786;
  --green: #4ade80;
  --red: #ffb4ab;
  --red-strong: #ef4444;
  --yellow: #fbbf24;
  --purple: #a78bfa;

  --glass-bg: rgba(15, 23, 42, 0.6);
  --glass-bg-deep: rgba(10, 15, 24, 0.8);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-border-bright: rgba(255, 255, 255, 0.18);
  --glass-divider: rgba(255, 255, 255, 0.05);
  --glass-blur: 12px;
  --glass-blur-strong: 20px;

  --font-display: "Quicksand", "Tajawal", sans-serif;
  --font-body: "Quicksand", "Tajawal", sans-serif;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --space-unit: 8px;
  --container-pad-desktop: 40px;
  --container-pad-mobile: 20px;

  --card: var(--surface-low);
  --input: var(--surface);
  --border: var(--glass-border);
  --accent: var(--primary);
  --accent-hover: var(--primary-dim);
  --blue: var(--primary);
  --dim: var(--on-surface-variant);
  --text: var(--on-surface);
  --user-bub: rgba(59, 130, 246, 0.12);
  --ai-bub: rgba(167, 139, 250, 0.12);
  --sys-bub: rgba(255, 255, 255, 0.04);
  --ptt-off: var(--surface);
  --ptt-on: rgba(74, 222, 128, 0.15);
  --log-bg: var(--surface-lowest);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--obsidian);
  color: var(--on-surface);
  font-family: var(--font-body);
  height: 100%;
  direction: rtl;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: radial-gradient(ellipse 80% 50% at 50% -10%, rgba(59,130,246,0.08), transparent),
              var(--obsidian);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  color: inherit;
}
button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
button:disabled { opacity: 0.5; cursor: not-allowed; }

input, select {
  font-family: inherit;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  color: var(--on-surface);
  border-radius: var(--radius-sm);
  padding: 11px 13px;
  font-size: 0.92rem;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}
input::placeholder { color: var(--outline); }
input:focus, select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
}
.glass-panel.deep {
  background: var(--glass-bg-deep);
  backdrop-filter: blur(var(--glass-blur-strong));
  -webkit-backdrop-filter: blur(var(--glass-blur-strong));
}

.topbar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 20px;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--glass-border);
  flex-shrink: 0;
}
.topbar h1 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: 1.15rem;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--on-surface), var(--primary-soft));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.topbar .status-pill {
  font-size: 0.78rem;
  color: var(--on-surface-variant);
  font-weight: 600;
}
.topbar .user-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--on-surface-variant);
  cursor: pointer;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  padding: 4px 12px 4px 4px;
  margin-right: auto;
  transition: border-color 160ms ease;
}
.topbar .user-chip:hover { border-color: var(--primary); }
.topbar .user-chip img {
  width: 26px; height: 26px; border-radius: 50%;
}

.lang-toggle-floating {
  position: absolute; top: 18px; left: 18px; z-index: 2;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  color: var(--on-surface); border: 1px solid var(--glass-border);
  border-radius: var(--radius-full); padding: 7px 16px;
  font-size: 0.8rem; font-weight: 700; font-family: var(--font-display);
}
.lang-toggle-floating:hover { border-color: var(--primary); }
.lang-toggle-pill {
  background: var(--surface); color: var(--on-surface); border: 1px solid var(--glass-border);
  border-radius: var(--radius-full); padding: 6px 14px; font-size: 0.78rem; font-weight: 700;
  font-family: var(--font-display);
}
.lang-toggle-pill:hover { border-color: var(--primary); }

.app-layout {
  display: flex;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.sidebar {
  width: 280px;
  flex-shrink: 0;
  background: rgba(11, 14, 21, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-left: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  flex-direction: column;
  z-index: 30;
  box-shadow: -10px 0 30px rgba(0,0,0,0.5);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 30px 24px;
}
.sidebar-brand h2 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary);
  margin: 0;
  letter-spacing: -0.02em;
}
.sidebar-brand .brand-icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  background: var(--primary);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 15px rgba(59,130,246,0.3);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 0 16px;
  margin-bottom: 24px;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-lg);
  color: var(--on-surface-variant);
  text-decoration: none;
  font-weight: 600;
  transition: all 200ms ease;
}
.nav-item:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--on-surface);
}
.nav-item.active {
  background: rgba(59, 130, 246, 0.15);
  color: var(--primary);
  border-right: 3px solid var(--primary);
}
.nav-item .icon { font-size: 1.2rem; }

.sidebar-settings {
  flex: 1;
  overflow-y: auto;
  padding: 0 24px 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 24px;
}

.sidebar-section {
  margin-bottom: 20px;
}
.sidebar-section h3 {
  font-size: 0.74rem;
  color: var(--on-surface-variant);
  margin: 0 0 10px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.main-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  position: relative;
}

.top-connect-wrapper {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  width: min(90%, 500px);
}

.bottom-control-dock {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  width: min(90%, 420px);
  padding: 15px;
  background: var(--glass-bg-deep);
  backdrop-filter: blur(var(--glass-blur-strong));
  -webkit-backdrop-filter: blur(var(--glass-blur-strong));
  border: 1px solid var(--glass-border-bright);
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.5), 0 0 20px rgba(59,130,246,0.1);
}

.chat-area {
  flex: 1;
  overflow-y: auto;
  padding: 80px 24px 150px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  z-index: 10;
}

.bubble {
  max-width: 78%;
  padding: 15px 20px;
  border-radius: var(--radius-lg);
  line-height: 1.6;
  font-size: 0.95rem;
  white-space: pre-wrap;
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  animation: bubbleIn 250ms cubic-bezier(0.4, 0, 0.2, 1) both;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}
@keyframes bubbleIn {
  from { opacity: 0; transform: translateY(10px) scale(0.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.bubble.user { align-self: flex-start; background: var(--user-bub); border-color: rgba(59,130,246,0.3); }
.bubble.ai   { align-self: flex-end;   background: var(--ai-bub); border-color: rgba(167,139,250,0.3); }
.bubble.sys  {
  align-self: center; background: var(--glass-bg-deep); color: var(--on-surface);
  font-size: 0.85rem; max-width: 90%; text-align: center; border-color: var(--glass-border-bright);
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}
.bubble .speaker {
  display: block; font-size: 0.76rem; color: var(--primary-soft);
  margin-bottom: 6px; font-weight: 700; letter-spacing: 0.03em;
}

.level-meter {
  width: 100%;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--surface-highest);
  overflow: hidden;
}
.level-meter > div {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--green), var(--primary), var(--purple));
  transition: width 80ms linear;
  box-shadow: 0 0 10px var(--primary-glow);
}

.ptt-btn {
  width: 80px; height: 80px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--glass-border-bright);
  color: var(--on-surface);
  font-size: 1.8rem;
  display: flex; align-items: center; justify-content: center;
  transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
  touch-action: none;
  position: relative;
  box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}
.ptt-btn .ptt-label {
  position: absolute; bottom: -28px; left: 50%; transform: translateX(-50%);
  font-size: 0.75rem; color: var(--on-surface-variant); white-space: nowrap;
  font-weight: 600;
}
.ptt-btn.armed {
  border-color: var(--primary);
  color: var(--primary-soft);
  background: rgba(59,130,246,0.1);
  animation: pttPulseIdle 2s ease-in-out infinite;
}
@keyframes pttPulseIdle {
  0%, 100% { box-shadow: 0 0 0 0 rgba(59,130,246,0.3); }
  50%      { box-shadow: 0 0 0 15px rgba(59,130,246,0); }
}
.ptt-btn.active {
  background: var(--ptt-on);
  border-color: var(--green);
  color: var(--green);
  transform: scale(1.08);
  box-shadow: 0 0 30px rgba(74,222,128,0.5);
  animation: none;
}

.connect-btn {
  width: 100%;
  padding: 14px 20px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, rgba(59,130,246,0.8), rgba(37,99,235,0.8));
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border-bright);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  font-family: var(--font-display);
  letter-spacing: 0.02em;
  box-shadow: 0 8px 25px rgba(59,130,246,0.3);
  transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
}
.connect-btn:hover { 
  box-shadow: 0 10px 30px rgba(59,130,246,0.5); 
  transform: translateY(-2px); 
  background: linear-gradient(135deg, rgba(59,130,246,0.95), rgba(37,99,235,0.95));
}
.connect-btn.connected { 
  background: linear-gradient(135deg, rgba(239,68,68,0.8), rgba(185,28,28,0.8)); 
  box-shadow: 0 8px 25px rgba(239,68,68,0.3); 
  border-color: rgba(255,180,171,0.3);
}
.connect-btn.connected:hover { box-shadow: 0 10px 30px rgba(239,68,68,0.5); }

.field-row { display: flex; gap: 8px; align-items: center; margin-bottom: 4px; }
.field-row select, .field-row input { flex: 1; width: 100%; }
.hint { font-size: 0.72rem; color: var(--outline); margin: 4px 0 0; }
.persona-preview {
  font-size: 0.8rem;
  color: var(--on-surface);
  background: var(--surface);
  border: 1px solid var(--glass-divider);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  margin-top: 8px;
  line-height: 1.7;
}
.icon-btn {
  background: var(--surface);
  border: 1px solid var(--glass-border);
  color: var(--on-surface);
  border-radius: var(--radius-sm);
  width: 38px; height: 38px;
  flex-shrink: 0;
  transition: border-color 160ms ease;
}
.icon-btn:hover { border-color: var(--primary); }
hr.sep { border: none; border-top: 1px solid var(--glass-divider); margin: 18px 0; }

.modal-overlay {
  position: fixed; inset: 0; background: rgba(5,8,13,0.75);
  display: none; align-items: center; justify-content: center; z-index: 50;
  padding: 20px;
  backdrop-filter: blur(4px);
}
.modal-overlay.open { display: flex; animation: fadeIn 180ms ease; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal-box {
  background: var(--glass-bg-deep);
  backdrop-filter: blur(var(--glass-blur-strong));
  -webkit-backdrop-filter: blur(var(--glass-blur-strong));
  border: 1px solid var(--glass-border);
  border-top: 2px solid var(--primary);
  border-radius: var(--radius-lg);
  width: min(720px, 100%); max-height: 80vh; display: flex; flex-direction: column;
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0,0,0,0.5);
}
.modal-box header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 20px; border-bottom: 1px solid var(--glass-divider);
  font-family: var(--font-display);
}
.modal-box .log-content {
  flex: 1; overflow-y: auto; background: var(--surface-lowest);
  font-family: ui-monospace, monospace; font-size: 0.78rem;
  padding: 14px 18px; white-space: pre-wrap; direction: ltr; text-align: left;
}
.modal-box footer {
  display: flex; gap: 10px; padding: 12px 18px; border-top: 1px solid var(--glass-divider);
}
.modal-box footer button {
  flex: 1; padding: 9px; border-radius: var(--radius-sm); background: var(--surface);
  color: var(--on-surface); border: 1px solid var(--glass-border);
}
.modal-box footer button:hover { border-color: var(--primary); }

.auth-screen {
  flex: 1; display: flex;
  position: relative;
  overflow: hidden;
  background: var(--obsidian);
}
.hero-3d-panel {
  flex: 1;
  position: relative;
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(ellipse 80% 80% at 50% 50%, rgba(59,130,246,0.15), transparent 80%), var(--obsidian);
}
.hero-brand {
  position: relative; z-index: 2; text-align: center; pointer-events: none;
}
.neon-text {
  font-family: var(--font-display); font-weight: 700; font-size: 3rem; margin: 0;
  color: #fff;
  text-shadow: 0 0 20px rgba(59,130,246,0.8), 0 0 40px rgba(167,139,250,0.6);
}
.hero-brand p {
  color: var(--on-surface-variant); font-size: 1.1rem; letter-spacing: 0.05em; margin-top: 10px;
}
.animate-float { animation: float 6s ease-in-out infinite; }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
.ambient-orb {
  position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.5;
  pointer-events: none; z-index: 1;
}
.ambient-orb.blue { width: 300px; height: 300px; background: var(--primary); top: 20%; left: 20%; }
.ambient-orb.purple { width: 250px; height: 250px; background: var(--purple); bottom: 20%; right: 20%; }

.hero-scene-container {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.hero-scene-container canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

.auth-card-container {
  width: 480px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  padding: 40px;
  position: relative;
  background: var(--glass-bg-deep);
  border-left: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--glass-blur-strong));
}

.auth-card {
  width: 100%; text-align: center;
  position: relative;
  z-index: 1;
}

/* ═══════════ إشعارات Toast ═══════════ */
.toast-container {
  position: fixed; bottom: 20px; right: 20px; z-index: 9999;
  display: flex; flex-direction: column; gap: 10px; pointer-events: none;
}
.toast {
  pointer-events: auto; padding: 12px 18px; border-radius: var(--radius-md);
  color: #fff; font-weight: 600; font-size: 0.9rem;
  border-left: 4px solid var(--primary);
  display: flex; align-items: center; justify-content: space-between;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}
.fade-in-up { animation: fadeInUp 0.3s ease forwards; }
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.auth-card h2 {
  font-family: var(--font-display); font-weight: 700; letter-spacing: -0.01em;
  margin: 0 0 4px; font-size: 1.6rem;
  background: linear-gradient(135deg, var(--on-surface), var(--primary-soft));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.auth-card p.sub { color: var(--on-surface-variant); font-size: 0.88rem; margin: 0 0 24px; }
.auth-card input { width: 100%; margin-bottom: 12px; }

.btn-google {
  width: 100%; background: rgba(255,255,255,0.92); color: #1f1f1f; border-radius: var(--radius-sm);
  padding: 12px; font-weight: 600; display: flex; align-items: center;
  justify-content: center; gap: 8px; margin-bottom: 10px;
  transition: transform 140ms ease;
}
.btn-google:hover { transform: translateY(-1px); }
.btn-guest {
  width: 100%; background: transparent; color: var(--primary-soft);
  border: 1px solid var(--primary); border-radius: var(--radius-sm);
  padding: 11px; font-weight: 600; margin-bottom: 14px;
  transition: box-shadow 160ms ease;
}
.btn-guest:hover { box-shadow: 0 0 0 4px var(--primary-glow); }
.btn-primary {
  width: 100%; background: linear-gradient(135deg, var(--primary), var(--primary-dim));
  color: #fff; border-radius: var(--radius-sm);
  padding: 12px; font-weight: 700; margin-top: 4px;
  box-shadow: 0 4px 20px rgba(59,130,246,0.25);
  transition: box-shadow 160ms ease, transform 160ms ease;
}
.btn-primary:hover { box-shadow: 0 6px 28px rgba(59,130,246,0.4); transform: translateY(-1px); }

.auth-divider { display: flex; align-items: center; gap: 10px; color: var(--outline); font-size: 0.78rem; margin: 6px 0 16px; }
.auth-divider::before, .auth-divider::after { content: ""; flex: 1; height: 1px; background: var(--glass-divider); }
.auth-switch { margin-top: 16px; font-size: 0.83rem; color: var(--on-surface-variant); }
.auth-switch a { color: var(--primary-soft); cursor: pointer; text-decoration: none; font-weight: 600; }
.auth-error { color: var(--red); font-size: 0.8rem; min-height: 1.2em; margin-top: 8px; }

#profileModal .modal-box { max-width: 420px; }
#profileModal input { margin-bottom: 0; }

.ad-slot {
  background: var(--surface);
  border: 1px dashed var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--outline);
  font-size: 0.72rem;
  text-align: center;
  padding: 12px;
  margin: 12px 0;
}
.ad-slot.banner { min-height: 60px; display: flex; align-items: center; justify-content: center; }

/* ═══════════ تجاوب: تصميم الهاتف المخصص (مطابق لـ Live Voice Mobile) ═══════════ */
@media (max-width: 820px) {
  .app-layout { flex-direction: column; position: relative; }
  .auth-screen { flex-direction: column; }
  .hero-3d-panel { height: 40vh; flex: none; }
  .auth-card-container { width: 100%; flex: 1; border-left: none; border-top: 1px solid var(--glass-border); padding: 20px 16px; border-radius: var(--radius-lg) var(--radius-lg) 0 0; }
  .neon-text { font-size: 2.2rem; }

  .sidebar {
    display: none !important;
  }
  .main-panel {
    order: 1; }

  .topbar { display: none !important; }

  .mobile-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 20px 0;
    position: absolute;
    top: 0; left: 0; right: 0;
    z-index: 20;
  }
  .mobile-header h2 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0;
    color: var(--primary);
  }
  .mobile-header .icon-btn {
    width: 40px; height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--primary);
    display: flex; align-items: center; justify-content: center;
  }

  .mobile-status {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    position: absolute;
    top: 100px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 15;
  }
  .mobile-status .status-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 15px var(--primary-glow);
    animation: pulse 2s infinite;
  }
  .mobile-status span {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    font-weight: 700;
    color: var(--primary-soft);
    text-transform: uppercase;
  }

  /* زر إنهاء الجلسة العائم (بديل X) */
  .top-connect-wrapper {
    top: auto;
    bottom: 120px; /* فوق المايك بقليل إذا لم تكن متصلة */
  }
  .connect-btn {
    padding: 10px 20px;
    font-size: 0.9rem;
    width: auto;
    border-radius: 40px;
  }

  /* منطقة المحادثة: جعلها في الأسفل فقط مثل الترجمة (Subtitles) لكي لا تغطي الشاشة */
  .chat-area {
    position: absolute;
    bottom: 140px;
    left: 0;
    right: 0;
    height: 35vh;
    padding: 20px;
    justify-content: flex-end;
    background: transparent;
    pointer-events: none; /* للسماح بالضغط على ما خلفها */
  }
  .bubble {
    pointer-events: auto;
    font-size: 0.9rem;
    padding: 12px 16px;
    max-width: 90%;
    margin: 0 auto;
    text-align: center;
  }
  .bubble.user { align-self: center; margin-bottom: -5px; opacity: 0.8; }
  .bubble.ai { align-self: center; }

  /* شريط التحكم السفلي (زر المايك): تفريغ الخلفية وجعله يطفو بأناقة */
  .bottom-control-dock {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    bottom: 20px;
  }
  .level-meter {
    display: none; /* إخفاء مؤشر الصوت في الموبايل للتبسيط */
  }
  
  .ptt-btn {
    background: var(--primary) !important;
    color: var(--on-primary) !important;
    border: none !important;
    box-shadow: 0 0 30px rgba(59,130,246,0.5) !important;
    width: 70px; height: 70px;
  }
  .ptt-btn .ptt-label {
    display: none; /* إخفاء نص "اضغط للتكلم" */
  }

  .auth-card { padding: 0; background: transparent; border: none; box-shadow: none; backdrop-filter: none; -webkit-backdrop-filter: none; }
  .lang-toggle-floating { top: 14px; left: 14px; padding: 6px 12px; }
}

/* ═══════════ تجاوب: تصميم الكمبيوتر المخصص (مطابق لـ Grammar Arena Desktop) ═══════════ */
@media (min-width: 1100px) {
  .sidebar { width: 340px; padding: 24px 24px 100px; }
  .chat-area { padding: 32px 40px; }
  .control-bar { padding: 20px 40px 26px; }
  .ptt-btn { width: 104px; height: 104px; }
  .auth-card { padding: 40px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

/* ═══════════════ كرة الصوت التفاعلية (خلف المحادثة) ═══════════════ */
.voice-sphere-container {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.18;
  transition: opacity 400ms ease;
}
.voice-sphere-container.active {
  opacity: 0.38;
}
.voice-sphere-container canvas {
  width: 100% !important;
  height: 100% !important;
  object-fit: contain;
}
@media (max-width: 820px) {
  .voice-sphere-container canvas {
    /* Let the 3D scene resize itself */
  }
}