/* ============================================================
   VHF MASTER — Production CSS (matches prototype-v2)
   ============================================================ */

:root {
  --deep: #0a0e1a;
  --surface: #131826;
  --surface-2: #1a2235;
  --line: #252e44;
  --brass: #c9a961;
  --brass-soft: #d4ba7a;
  --brass-dim: #8b7445;
  --ink: #f5f1e8;
  --ink-soft: #e8e3d6;
  --ink-mid: #9aa3b8;
  --ink-dim: #5a647a;
  --accent: #7dd3c0;
  --warning: #d96e6e;
  --success: #58cc02;
}

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--deep);
  color: var(--ink);
  font-family: 'Inter Tight', sans-serif;
  -webkit-font-smoothing: antialiased;
  user-select: none;
  -webkit-user-select: none;
  overscroll-behavior: none;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  background: 
    radial-gradient(ellipse at top, rgba(201, 169, 97, 0.06), transparent 60%),
    radial-gradient(ellipse at bottom, rgba(125, 211, 192, 0.04), transparent 50%),
    var(--deep);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.4'/%3E%3C/svg%3E");
  opacity: 0.025;
  pointer-events: none;
  z-index: 100;
  mix-blend-mode: overlay;
}

.app {
  width: 100%;
  max-width: 440px;
  height: 100vh;
  height: 100dvh;
  background: var(--surface);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

@media (min-width: 500px) {
  .app {
    max-height: 900px;
    box-shadow: 0 40px 80px rgba(0,0,0,0.5), 0 0 0 1px rgba(201,169,97,0.08);
  }
}

/* SCREENS */
.screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transform: translateX(20px);
  transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1), transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  padding-top: env(safe-area-inset-top, 0);
  padding-bottom: env(safe-area-inset-bottom, 0);
}
.screen.active {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}

/* BUTTONS */
.btn-primary {
  width: 100%;
  padding: 16px;
  background: var(--brass);
  color: var(--deep);
  border: none;
  border-radius: 12px;
  font-family: 'Inter Tight', sans-serif;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  margin-top: 8px;
}
.btn-primary:hover, .btn-primary:active {
  background: var(--brass-soft);
  transform: translateY(-1px);
}
.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-text {
  width: 100%;
  padding: 14px;
  background: transparent;
  border: none;
  color: var(--ink-mid);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  cursor: pointer;
  margin-top: 4px;
}
.btn-text:hover { color: var(--ink-soft); }

.btn-danger {
  width: 100%;
  padding: 14px;
  background: transparent;
  border: 1px solid var(--warning);
  border-radius: 12px;
  color: var(--warning);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  cursor: pointer;
  margin-top: 24px;
}

.back-btn {
  width: 42px;
  height: 42px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 300;
  line-height: 1;
  padding: 0 4px 2px 0;
  flex-shrink: 0;
  transition: all 0.2s;
  position: relative;
  z-index: 5;
}
.back-btn:hover, .back-btn:active {
  border-color: var(--brass);
  background: var(--surface);
  color: var(--brass);
  transform: scale(0.96);
}

.divider-or {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 18px 0 12px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.3em;
  color: var(--ink-dim);
}
.divider-or::before, .divider-or::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--line);
}

/* FORM */
.form-field { margin-bottom: 14px; }
.form-label {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--ink-mid);
  margin-bottom: 8px;
  text-transform: uppercase;
}
.form-input {
  width: 100%;
  padding: 14px 16px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  font-family: 'Inter Tight', sans-serif;
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s, background 0.2s;
  -webkit-appearance: none;
  user-select: text;
  -webkit-user-select: text;
}
.form-input:focus {
  border-color: var(--brass);
  background: var(--surface);
}
.form-input::placeholder { color: var(--ink-dim); }

.message-box {
  display: none;
  padding: 10px 14px;
  border-radius: 10px;
  font-family: 'Inter Tight', sans-serif;
  font-size: 13px;
  margin-bottom: 14px;
}
.message-box.show { display: block; }
.message-box.error {
  background: rgba(217, 110, 110, 0.1);
  border: 1px solid var(--warning);
  color: var(--warning);
}
.message-box.success {
  background: rgba(88, 204, 2, 0.1);
  border: 1px solid var(--success);
  color: var(--success);
}

/* LOADING */
.loading-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
}

.brand-mark-large {
  width: 64px;
  height: 64px;
  border: 2px solid var(--brass);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Playfair Display', serif;
  font-style: italic;
  font-size: 28px;
  color: var(--brass);
  margin-bottom: 24px;
  animation: pulse-mark 2s ease-in-out infinite;
}

@keyframes pulse-mark {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(201, 169, 97, 0.4); }
  50% { opacity: 0.7; box-shadow: 0 0 0 20px rgba(201, 169, 97, 0); }
}

.loading-title {
  font-family: 'Inter Tight', sans-serif;
  font-size: 28px;
  font-weight: 300;
  letter-spacing: 0.15em;
  margin-bottom: 8px;
}

.loading-sub {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--ink-mid);
  text-transform: uppercase;
}

/* WELCOME */
.welcome-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 32px 28px 28px;
}
.welcome-hero { margin-bottom: 32px; }

.brand-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 56px;
}
.brand-mark {
  width: 36px;
  height: 36px;
  border: 1.5px solid var(--brass);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Playfair Display', serif;
  font-style: italic;
  font-size: 16px;
  color: var(--brass);
}
.brand-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.25em;
  color: var(--ink-mid);
  text-transform: uppercase;
}

.welcome-title {
  font-family: 'Inter Tight', sans-serif;
  font-size: 38px;
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}
.welcome-title .accent {
  font-family: 'Playfair Display', serif;
  font-style: italic;
  font-weight: 400;
  color: var(--brass);
}
.welcome-sub {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--ink-mid);
  text-transform: uppercase;
  margin-top: 14px;
}
.welcome-desc {
  font-family: 'Cairo', sans-serif;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  direction: rtl;
  text-align: right;
  margin-top: 28px;
  max-width: 320px;
}

.welcome-form { margin-top: auto; }

/* SCREEN HEADER */
.screen-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px 32px;
}

.step-indicator {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--ink-dim);
  text-transform: uppercase;
}

/* ACTIVATION */
.login-content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.login-body {
  flex: 1;
  padding: 0 28px;
}

.login-title {
  font-family: 'Inter Tight', sans-serif;
  font-size: 32px;
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 12px;
}
.login-title .em {
  font-family: 'Playfair Display', serif;
  font-style: italic;
  color: var(--brass);
}
.login-desc {
  font-family: 'Cairo', sans-serif;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mid);
  direction: rtl;
  text-align: right;
  margin-bottom: 36px;
}

/* DOWNLOAD */
.download-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 28px;
  text-align: center;
}

.download-icon {
  font-size: 60px;
  margin-bottom: 24px;
  opacity: 0.8;
  animation: bob 3s ease-in-out infinite;
}

@keyframes bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.download-title {
  font-family: 'Inter Tight', sans-serif;
  font-size: 32px;
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 12px;
}
.download-title .em {
  font-family: 'Playfair Display', serif;
  font-style: italic;
  color: var(--brass);
}

.download-desc {
  font-family: 'Cairo', sans-serif;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mid);
  direction: rtl;
  text-align: center;
  margin-bottom: 32px;
}

.download-progress {
  width: 100%;
  max-width: 320px;
  margin-bottom: 40px;
}

.download-bar {
  width: 100%;
  height: 6px;
  background: var(--line);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 14px;
}
.download-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--brass-dim), var(--brass));
  border-radius: 3px;
  width: 0%;
  transition: width 0.5s ease;
}

.download-stats {
  display: flex;
  justify-content: center;
  align-items: baseline;
  gap: 6px;
  font-family: 'Inter Tight', sans-serif;
  font-size: 24px;
  font-weight: 300;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}
.download-stats .separator { color: var(--ink-dim); }
.download-stats .label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--ink-mid);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-left: 6px;
}

.download-size {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-dim);
  letter-spacing: 0.1em;
}

.download-info {
  width: 100%;
  max-width: 320px;
}

.info-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}
.info-row:last-child { border-bottom: none; }
.info-icon { font-size: 16px; }
.info-text {
  font-family: 'Inter Tight', sans-serif;
  font-size: 12px;
  color: var(--ink-mid);
}

/* HOME */
.home-header {
  padding: 24px 22px 18px;
  border-bottom: 1px solid var(--line);
  flex-shrink: 0;
}

.home-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.home-greeting {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--ink-mid);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.home-name {
  font-family: 'Inter Tight', sans-serif;
  font-size: 22px;
  font-weight: 400;
  letter-spacing: -0.01em;
}
.home-name em {
  font-family: 'Playfair Display', serif;
  font-style: italic;
  color: var(--brass);
}

.home-icon-btn {
  width: 36px;
  height: 36px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 14px;
}

.home-stats {
  display: flex;
  gap: 24px;
}
.home-stat-item { display: flex; flex-direction: column; }
.home-stat-num {
  font-family: 'Inter Tight', sans-serif;
  font-size: 24px;
  font-weight: 300;
  color: var(--brass);
  line-height: 1;
}
.home-stat-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.15em;
  color: var(--ink-mid);
  text-transform: uppercase;
  margin-top: 4px;
}

.offline-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: rgba(125, 211, 192, 0.08);
  border: 1px solid var(--accent);
  border-radius: 8px;
  margin-top: 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--accent);
  letter-spacing: 0.1em;
}
.offline-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* LESSONS LIST */
.lessons-section {
  flex: 1;
  overflow-y: auto;
  padding: 18px 0 24px;
  -webkit-overflow-scrolling: touch;
}
.lessons-section::-webkit-scrollbar { display: none; }
.lessons-section { scrollbar-width: none; }

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 0 22px;
  margin-bottom: 12px;
  margin-top: 24px;
}
.section-header:first-child { margin-top: 0; }
.section-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.25em;
  color: var(--brass);
  text-transform: uppercase;
}
.section-meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.15em;
  color: var(--ink-dim);
}

.lessons-list { padding: 0 14px; }

.lesson-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px;
  margin-bottom: 2px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
}
.lesson-card:hover, .lesson-card:active {
  background: var(--surface-2);
  border-color: var(--line);
}
.lesson-num {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  font-family: 'Playfair Display', serif;
  font-style: italic;
  font-size: 14px;
  color: var(--ink-mid);
  flex-shrink: 0;
  transition: all 0.2s;
}
.lesson-card:hover .lesson-num,
.lesson-card:active .lesson-num {
  border-color: var(--brass);
  color: var(--brass);
}
.lesson-info { flex: 1; min-width: 0; }
.lesson-title {
  font-family: 'Inter Tight', sans-serif;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin-bottom: 3px;
}
.lesson-sub {
  font-family: 'Cairo', sans-serif;
  font-size: 12px;
  color: var(--ink-mid);
  direction: rtl;
  text-align: right;
}
.lesson-arrow {
  color: var(--ink-dim);
  font-size: 18px;
  font-weight: 300;
}

/* LESSON DETAIL */
.lesson-header {
  padding: 16px 22px 18px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--surface);
  position: relative;
  z-index: 5;
  flex-shrink: 0;
}

.lesson-header-info { flex: 1; }
.lesson-header-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--brass);
  text-transform: uppercase;
  margin-bottom: 4px;
}
.lesson-header-title {
  font-family: 'Inter Tight', sans-serif;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
  line-height: 1.2;
}
.lesson-header-title em {
  font-family: 'Playfair Display', serif;
  font-style: italic;
  color: var(--brass);
}
.lesson-header-sub {
  font-family: 'Cairo', sans-serif;
  font-size: 12px;
  color: var(--ink-mid);
  direction: rtl;
}

.phrases-list {
  flex: 1;
  overflow-y: auto;
  padding: 18px 18px 30px;
  -webkit-overflow-scrolling: touch;
}
.phrases-list::-webkit-scrollbar { display: none; }
.phrases-list { scrollbar-width: none; }

.phrase-card {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 14px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 14px;
  margin-bottom: 10px;
  position: relative;
  transition: all 0.2s;
  cursor: pointer;
}
.phrase-card.playing {
  border-color: var(--brass);
  background: linear-gradient(135deg, rgba(201, 169, 97, 0.08), transparent);
}

.phrase-play-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--brass);
  border: none;
  color: var(--deep);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  font-size: 14px;
  transition: all 0.2s;
  position: relative;
}
.phrase-play-btn:hover, .phrase-play-btn:active {
  background: var(--brass-soft);
  transform: scale(1.05);
}
.phrase-play-btn .icon-play { display: block; }
.phrase-play-btn .icon-pause { display: none; }
.phrase-card.playing .phrase-play-btn .icon-play { display: none; }
.phrase-card.playing .phrase-play-btn .icon-pause { display: block; }

.phrase-play-btn::before {
  content: '';
  position: absolute;
  inset: -4px;
  border: 1.5px solid var(--brass);
  border-radius: 50%;
  opacity: 0;
}
.phrase-card.playing .phrase-play-btn::before {
  opacity: 1;
  animation: pulse-ring 1.5s ease-out infinite;
}
@keyframes pulse-ring {
  0% { transform: scale(1); opacity: 0.8; }
  100% { transform: scale(1.3); opacity: 0; }
}

.phrase-content { flex: 1; padding-top: 2px; min-width: 0; }
.phrase-en {
  font-family: 'Inter Tight', sans-serif;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.45;
  color: var(--ink);
  margin-bottom: 6px;
  user-select: text;
  -webkit-user-select: text;
}
.phrase-ar {
  font-family: 'Cairo', sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-mid);
  direction: rtl;
  text-align: right;
  user-select: text;
  -webkit-user-select: text;
}

.phrase-waveform {
  display: none;
  margin-top: 10px;
  height: 24px;
  align-items: center;
  gap: 3px;
}
.phrase-card.playing .phrase-waveform { display: flex; }
.phrase-waveform .bar {
  width: 2px;
  background: var(--brass);
  border-radius: 1px;
  animation: wave 1s ease-in-out infinite;
}
.phrase-waveform .bar:nth-child(1) { height: 30%; animation-delay: 0s; }
.phrase-waveform .bar:nth-child(2) { height: 60%; animation-delay: 0.1s; }
.phrase-waveform .bar:nth-child(3) { height: 90%; animation-delay: 0.2s; }
.phrase-waveform .bar:nth-child(4) { height: 50%; animation-delay: 0.3s; }
.phrase-waveform .bar:nth-child(5) { height: 70%; animation-delay: 0.4s; }
.phrase-waveform .bar:nth-child(6) { height: 40%; animation-delay: 0.5s; }
.phrase-waveform .bar:nth-child(7) { height: 80%; animation-delay: 0.6s; }
.phrase-waveform .bar:nth-child(8) { height: 30%; animation-delay: 0.7s; }
@keyframes wave {
  0%, 100% { transform: scaleY(0.5); }
  50% { transform: scaleY(1); }
}

/* SETTINGS */
.settings-header {
  padding: 16px 22px 18px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 16px;
}

.settings-title {
  font-family: 'Inter Tight', sans-serif;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.settings-content {
  flex: 1;
  overflow-y: auto;
  padding: 24px 22px;
}

.settings-section { margin-bottom: 28px; }

.settings-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.25em;
  color: var(--brass);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.settings-card {
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 4px 16px;
}

.settings-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.settings-row:last-child { border-bottom: none; }

.settings-key {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-mid);
  letter-spacing: 0.1em;
}

.settings-value {
  font-family: 'Inter Tight', sans-serif;
  font-size: 14px;
  color: var(--ink);
  font-weight: 500;
  max-width: 60%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}