/* ============================================================
   ScreenLink Viewer - Dark Theme Stylesheet
   ============================================================ */

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

:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a1a;
  --bg-elevated: #242424;
  --bg-overlay: rgba(10, 10, 10, 0.85);
  --accent: #00d4ff;
  --accent-glow: rgba(0, 212, 255, 0.25);
  --accent-dim: rgba(0, 212, 255, 0.6);
  --text-primary: #f0f0f0;
  --text-secondary: #888;
  --text-muted: #555;
  --error: #ff4466;
  --warning: #ffaa00;
  --success: #00cc88;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.25s ease;
  --font-main: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
}

html, body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Landing Page --- */
body.landing {
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(0, 212, 255, 0.06) 0%, transparent 60%),
    var(--bg-primary);
}

.landing-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  width: 100%;
  max-width: 460px;
  min-height: 100vh;
}

/* Logo */
.logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.logo-icon {
  filter: drop-shadow(0 0 12px var(--accent-glow));
  animation: logoPulse 3s ease-in-out infinite;
}

@keyframes logoPulse {
  0%, 100% { filter: drop-shadow(0 0 12px var(--accent-glow)); }
  50%      { filter: drop-shadow(0 0 20px rgba(0, 212, 255, 0.4)); }
}

.logo-text {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.landing-header {
  text-align: center;
  margin-bottom: 3rem;
}

.tagline {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-top: 0.75rem;
  line-height: 1.5;
}

/* PIN Form */
.pin-form {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.pin-input-wrapper {
  position: relative;
  width: 100%;
  max-width: 320px;
}

.pin-input {
  display: block;
  width: 100%;
  padding: 1rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: 0.5em;
  text-align: center;
  text-transform: uppercase;
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 2px solid var(--bg-elevated);
  border-radius: var(--radius);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  caret-color: var(--accent);
}

.pin-input::placeholder {
  color: var(--text-muted);
  letter-spacing: 0.5em;
  font-weight: 400;
}

.pin-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-glow), 0 0 24px var(--accent-glow);
}

.pin-input:focus + .pin-underline {
  transform: scaleX(1);
}

.pin-underline {
  position: absolute;
  bottom: 0;
  left: 10%;
  right: 10%;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.pin-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Connect Button */
.connect-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.9rem 2.5rem;
  margin-top: 0.75rem;
  font-family: var(--font-main);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--bg-primary);
  background: var(--accent);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--transition), transform 0.15s ease, opacity var(--transition), box-shadow var(--transition);
  min-width: 180px;
  min-height: 48px;
}

.connect-btn:hover:not(:disabled) {
  background: #33ddff;
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-1px);
}

.connect-btn:active:not(:disabled) {
  transform: translateY(0);
}

.connect-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
}

.connect-btn-icon {
  transition: transform 0.2s ease;
}

.connect-btn:hover:not(:disabled) .connect-btn-icon {
  transform: translateX(3px);
}

/* Footer */
.landing-footer {
  margin-top: auto;
  padding-top: 3rem;
  padding-bottom: 1.5rem;
  text-align: center;
}

.landing-footer p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Viewer Page --- */
body.viewer {
  background: #000;
  cursor: none;
}

body.viewer.controls-visible {
  cursor: default;
}

/* Video Element */
#remote-video {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
  z-index: 1;
}

/* --- Status Overlay --- */
.status {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-overlay);
  z-index: 100;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.status.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.status-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  text-align: center;
  padding: 2rem;
}

.status-inner p {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-primary);
  max-width: 300px;
  line-height: 1.5;
}

/* Spinner */
.status-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--bg-elevated);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.status.connected .status-spinner {
  border-top-color: var(--success);
  animation: spin 0.8s linear infinite, fadeOut 0.5s ease 1s forwards;
}

.status.disconnected .status-spinner {
  border-top-color: var(--warning);
  animation: none;
  border: 3px solid var(--warning);
  opacity: 0.6;
}

.status.error .status-spinner {
  border-top-color: var(--error);
  animation: none;
  border: 3px solid var(--error);
  opacity: 0.6;
}

.status.waiting .status-spinner {
  border-top-color: var(--accent);
  animation: spin 1.2s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes fadeOut {
  to { opacity: 0; }
}

/* Status text color based on state */
.status.connected .status-inner p {
  color: var(--success);
}

.status.disconnected .status-inner p {
  color: var(--warning);
}

.status.error .status-inner p {
  color: var(--error);
}

/* --- Controls Overlay --- */
.controls {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 50;
  pointer-events: none;
  opacity: 1;
  transition: opacity 0.4s ease;
}

.controls.hidden {
  opacity: 0;
}

.controls.hidden .control-btn,
.controls.hidden .session-badge {
  pointer-events: none;
}

.controls-top {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: linear-gradient(to bottom, rgba(0,0,0,0.7) 0%, transparent 100%);
  pointer-events: auto;
}

.controls-bottom {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
  padding: 1rem 1.25rem;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 100%);
  pointer-events: auto;
}

/* Session Badge */
.session-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  pointer-events: auto;
}

.session-badge-icon {
  color: var(--accent);
  flex-shrink: 0;
}

.session-id-text {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--accent);
}

/* Control Buttons */
.control-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.9rem;
  font-family: var(--font-main);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  min-height: 40px;
  pointer-events: auto;
}

.control-btn:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.25);
}

.control-btn:active {
  background: rgba(255, 255, 255, 0.25);
}

.disconnect-btn:hover {
  background: rgba(255, 68, 102, 0.25);
  border-color: var(--error);
  color: var(--error);
}

.control-btn-label {
  display: inline;
}

/* --- Quality Selector --- */
.quality-selector {
  position: relative;
}

.quality-menu {
  display: none;
  position: absolute;
  bottom: calc(100% + 0.5rem);
  left: 50%;
  transform: translateX(-50%);
  min-width: 140px;
  padding: 0.35rem;
  background: rgba(30, 30, 30, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 60;
}

.quality-menu.open {
  display: flex;
  flex-direction: column;
}

.quality-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.75rem;
  font-family: var(--font-main);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  background: transparent;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background var(--transition);
}

.quality-option:hover {
  background: rgba(255, 255, 255, 0.12);
}

.quality-option.active {
  color: var(--accent);
}

.quality-detail {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: 0.75rem;
}

.quality-option.active .quality-detail {
  color: var(--accent-dim);
}

/* --- Stats Panel --- */
.stats-panel {
  position: fixed;
  top: 1rem;
  right: 1rem;
  min-width: 220px;
  padding: 0.75rem 1rem;
  background: rgba(10, 10, 10, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 80;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.stats-panel.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.stats-header {
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.stats-grid {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.stats-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.stats-label {
  color: var(--text-secondary);
}

.stats-value {
  color: var(--text-primary);
  text-align: right;
}

/* --- Responsive --- */
@media (max-width: 600px) {
  /* Landing adjustments */
  .logo-text {
    font-size: 1.6rem;
  }

  .tagline {
    font-size: 0.95rem;
  }

  .pin-input {
    font-size: 1.5rem;
    padding: 0.85rem 1rem;
    letter-spacing: 0.4em;
  }

  .connect-btn {
    width: 100%;
    max-width: 320px;
  }

  /* Viewer adjustments */
  .controls-top {
    padding: 0.75rem;
  }

  .controls-bottom {
    padding: 0.75rem;
  }

  .control-btn {
    padding: 0.5rem 0.65rem;
    min-height: 44px;
    min-width: 44px;
    justify-content: center;
  }

  .control-btn-label {
    display: none;
  }

  .session-id-text {
    font-size: 0.8rem;
  }
}

@media (max-width: 380px) {
  .pin-input {
    font-size: 1.25rem;
    letter-spacing: 0.3em;
  }

  .landing-container {
    padding: 1rem;
  }
}

/* --- Animations --- */
@keyframes statusFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.status-inner {
  animation: statusFadeIn 0.4s ease;
}

/* --- Selection --- */
::selection {
  background: var(--accent);
  color: var(--bg-primary);
}

/* --- Scrollbar (for landing page if content overflows) --- */
::-webkit-scrollbar {
  width: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--bg-elevated);
  border-radius: 3px;
}

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

/* --- Focus visible for accessibility --- */
.control-btn:focus-visible,
.connect-btn:focus-visible,
.pin-input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Remove default outline for mouse users */
.control-btn:focus:not(:focus-visible),
.connect-btn:focus:not(:focus-visible) {
  outline: none;
}