/* ===================================================================
   c4r37 — JPD Pattern Mastery : Speaking Module Stylesheet
   Strictly implements japanese_vibe_design_system.md
   Wabi-Sabi & Zen Aesthetic (Ma, Shibui, Washi, Sumi, Hanko)
   =================================================================== */

:root {
  /* --- Colors: Light (Washi Canvas & Zen Tones) --- */
  --washi: #F7F5F0;
  --surface: #FDFBF7;
  --pure-surface: #FDFBF7;
  --surface-soft: #EFECE6;
  --field: #F3F0EA;

  --sumi: #1C1B19;
  --ash: #5A5751;
  --muted: #8C8881;
  --whisper: #E6E2D8;

  --primary: #2D3A3A;
  --secondary: #5F6F52;
  --hanko: #B84A39;
  --glyph-hover: #9E3E2F;
  --glyph-pressed: #7E2F23;

  /* Aliases */
  --bg-canvas: var(--washi);
  --bg-surface: var(--surface);
  --text-main: var(--sumi);
  --text-muted: var(--ash);
  --border-line: var(--whisper);
  --accent: var(--hanko);

  /* --- Spacing & Radius (Hairline Geometry: 0px - 4px) --- */
  --radius-none: 0px;
  --radius-xs: 2px;
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 4px;
  --radius-xl: 4px;
  --radius-2xl: 4px;
  --radius-3xl: 4px;
  --radius-pill: 9999px;

  /* --- Shadows (Diffused, warm, low contrast - Level 1 to 2) --- */
  --shadow-card: 0 2px 10px -2px rgba(28, 27, 25, 0.05);
  --shadow-hover: 0 4px 16px -2px rgba(28, 27, 25, 0.08);
  --shadow-subtle: 0 1px 3px rgba(28, 27, 25, 0.04);

  /* --- Motion (Serene & deliberate, no bouncy spring) --- */
  --ease-standard: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-enter: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.2s var(--ease-standard);
  --transition-normal: 0.3s var(--ease-standard);
}

/* --- Dark Mode (Wabi-Sabi Zen Dark) --- */
[data-theme="dark"] {
  --washi: #1C1B19;
  --surface: #242320;
  --pure-surface: #242320;
  --surface-soft: #2B2A26;
  --field: #2B2A26;

  --sumi: #F1EEE6;
  --ash: #B9B4A9;
  --muted: #96928A;
  --whisper: #34322D;

  --primary: #C9D1C8;
  --secondary: #7A8F6C;
  --hanko: #B84A39;
  --glyph-hover: #D05B47;
  --glyph-pressed: #9E3E2F;

  --bg-canvas: var(--washi);
  --bg-surface: var(--surface);
  --text-main: var(--sumi);
  --text-muted: var(--ash);
  --border-line: var(--whisper);
  --accent: var(--hanko);

  --shadow-card: 0 2px 12px -2px rgba(0, 0, 0, 0.35);
  --shadow-hover: 0 6px 20px -2px rgba(0, 0, 0, 0.5);
  --shadow-subtle: 0 1px 4px rgba(0, 0, 0, 0.3);

  color-scheme: dark;
}

/* Base Body Styles */
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: "Be Vietnam Pro", "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-canvas);
  color: var(--text-main);
  line-height: 1.8;
  font-size: 15px;
  letter-spacing: 0.015em;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography styles */
.display-font {
  font-family: "Space Grotesk", "Be Vietnam Pro", sans-serif;
  letter-spacing: -0.02em;
}

.font-japanese {
  font-family: "Noto Sans JP", sans-serif;
  line-height: 1.85;
  font-style: normal !important;
}

.font-mono {
  font-family: "Geist Mono", "JetBrains Mono", monospace;
}

/* Containers */
.refined-container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(1rem, 4vw, 2.5rem);
  padding-right: clamp(1rem, 4vw, 2.5rem);
}

/* Navigation bar */
.c4r37-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: color-mix(in srgb, var(--bg-canvas) 92%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-line);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-line);
  background-color: var(--bg-surface);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.theme-toggle-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background-color: color-mix(in srgb, var(--accent) 8%, transparent);
  transform: translateY(-1px);
}

.theme-toggle-btn:active {
  transform: scale(0.96);
}

[data-theme="dark"] .theme-toggle-btn {
  background-color: var(--surface-soft);
  color: var(--text-muted);
}

[data-theme="dark"] .theme-toggle-btn:hover {
  background-color: color-mix(in srgb, var(--accent) 12%, transparent);
  border-color: var(--accent);
  color: var(--accent);
}

[data-theme="dark"] .theme-toggle-btn i.fa-sun {
  color: var(--accent);
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: var(--accent);
  color: #F7F5F0 !important;
  font-weight: 600;
  font-size: 0.875rem;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--accent);
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 8px -1px rgba(184, 74, 57, 0.25);
  user-select: none;
  text-decoration: none;
}

.btn-primary:hover {
  background-color: var(--glyph-hover);
  border-color: var(--glyph-hover);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: scale(0.98);
}

/* Audio active / stop button state */
.btn-stop-audio {
  background-color: var(--primary) !important;
  border-color: var(--primary) !important;
  color: var(--on-primary, #F7F5F0) !important;
  animation: audioPulse 1.5s infinite ease-in-out;
}

@keyframes audioPulse {
  0% { box-shadow: 0 0 0 0 rgba(45, 58, 58, 0.4); }
  70% { box-shadow: 0 0 0 6px rgba(45, 58, 58, 0); }
  100% { box-shadow: 0 0 0 0 rgba(45, 58, 58, 0); }
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: var(--bg-surface);
  color: var(--text-main);
  font-weight: 500;
  font-size: 0.875rem;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-line);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-secondary:hover {
  background-color: var(--surface-soft);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

.btn-secondary:active {
  transform: scale(0.98);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: transparent;
  color: var(--text-muted);
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-ghost:hover {
  background-color: var(--surface-soft);
  color: var(--text-main);
}

/* Cards & Surfaces (Wabi-Sabi Hairline & Ma) */
.c4r37-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-normal);
}

@media (min-width: 768px) {
  .c4r37-card {
    padding: 2.25rem;
  }
}

.c4r37-card-interactive {
  cursor: pointer;
}

.c4r37-card-interactive:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border-line));
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

/* Inner highlight / sub-containers */
.c4r37-subcard {
  background-color: var(--surface-soft);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

/* Sidebar navigation item */
.sidebar-tab-btn {
  width: 100%;
  text-align: left;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  background-color: transparent;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-tab-btn:hover {
  background-color: var(--surface-soft);
  color: var(--text-main);
}

.sidebar-tab-btn.active {
  background-color: color-mix(in srgb, var(--accent) 8%, var(--surface-soft));
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

[data-theme="dark"] .sidebar-tab-btn.active {
  background-color: color-mix(in srgb, var(--accent) 15%, transparent);
  border-color: var(--accent);
  color: var(--accent);
}

/* Badge & Pills - Hanko Inspired */
.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.725rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background-color: color-mix(in srgb, var(--accent) 8%, var(--surface-soft));
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, var(--border-line));
}

/* Form Controls */
.c4r37-select, .c4r37-input {
  width: 100%;
  background-color: var(--field);
  border: 1px solid var(--border-line);
  color: var(--text-main);
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.c4r37-select:focus, .c4r37-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--primary) 15%, transparent);
}

/* Step list flow */
.step-number {
  width: 26px;
  height: 26px;
  border-radius: var(--radius-sm);
  background-color: var(--surface-soft);
  border: 1px solid var(--border-line);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.75rem;
  font-family: var(--font-mono, monospace);
  flex-shrink: 0;
}

/* Item selector quick jumping */
.item-jump-badge {
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-line);
  background-color: var(--bg-surface);
  color: var(--text-muted);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.item-jump-badge:hover {
  border-color: var(--accent);
  color: var(--accent);
  background-color: color-mix(in srgb, var(--accent) 6%, transparent);
}

.item-jump-badge.current {
  background-color: var(--accent);
  color: #F7F5F0 !important;
  border-color: var(--accent);
}

/* Pulse animation for timer */
@keyframes timerPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.02); }
  100% { transform: scale(1); }
}

.timer-running {
  animation: timerPulse 1s infinite var(--ease-standard);
  border-color: var(--accent) !important;
}

/* Japanese typography enhancements - NEVER italicize Japanese text */
.jp-reading-text {
  font-family: "Noto Sans JP", sans-serif;
  font-size: clamp(1.2rem, 3vw, 1.65rem);
  line-height: 1.9;
  letter-spacing: 0.03em;
  font-feature-settings: "palt";
  font-style: normal !important;
}

.jp-question-text {
  font-family: "Noto Sans JP", sans-serif;
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  line-height: 1.8;
  letter-spacing: 0.02em;
  font-style: normal !important;
}

/* Custom scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-canvas);
}

::-webkit-scrollbar-thumb {
  background: var(--border-line);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}