/* ===== Assignment Helper — styles ===== */

:root {
  --bg: #0f1117;
  --card: #1a1d27;
  --border: #2a2d3a;
  --accent: #6c8cff;
  --accent-hover: #8ba3ff;
  --text: #e8eaed;
  --text-secondary: #9aa0b0;
}

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

/* The hidden attribute must win over the display: flex/grid rules below,
   otherwise hideStatus()/hideError() have no visual effect. */
[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  padding: 48px 20px;
  background:
    radial-gradient(1100px 420px at 50% -12%, rgba(108, 140, 255, 0.10), transparent 70%),
    var(--bg);
  color: var(--text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif, Arial;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 960px;
  margin: 0 auto;
}

/* ===== Password gate ===== */
.gate {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background:
    radial-gradient(1100px 420px at 50% -12%, rgba(108, 140, 255, 0.10), transparent 70%),
    var(--bg);
}

.gate-card {
  width: 100%;
  max-width: 380px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  text-align: center;
}

.gate-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  border-radius: 12px;
  color: var(--accent);
  background: rgba(108, 140, 255, 0.10);
  border: 1px solid rgba(108, 140, 255, 0.28);
}

.gate-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 4px;
}

.gate-sub {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.gate-input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #12141c;
  color: var(--text);
  font-family: inherit;
  font-size: 15px;
  outline: none;
  transition: border-color 0.18s ease;
}

.gate-input::placeholder {
  color: #6b7080;
}

.gate-input:focus {
  border-color: var(--accent);
}

.gate-error {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 13px;
  color: #ff9a9a;
  background: rgba(255, 90, 90, 0.08);
  border: 1px solid rgba(255, 90, 90, 0.35);
}

.gate-submit {
  margin-top: 16px;
}

.gate-hint {
  margin-top: 14px;
  padding: 6px 10px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.18s ease;
}

.gate-hint:hover {
  color: var(--text);
}

.gate-hint-msg {
  margin-top: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}

/* Wrong-password shake */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  15% { transform: translateX(-10px); }
  30% { transform: translateX(9px); }
  45% { transform: translateX(-7px); }
  60% { transform: translateX(5px); }
  75% { transform: translateX(-3px); }
}

.gate-card.shake {
  animation: shake 0.45s cubic-bezier(0.36, 0.07, 0.19, 0.97);
}

.gate-error.flash {
  animation: shake 0.45s cubic-bezier(0.36, 0.07, 0.19, 0.97);
}

/* ===== Header ===== */
.header {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 24px;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border-radius: 12px;
  color: var(--accent);
  background: rgba(108, 140, 255, 0.10);
  border: 1px solid rgba(108, 140, 255, 0.28);
}

.title {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  background: linear-gradient(90deg, #e8eaed 0%, #aab6ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.subtitle {
  font-size: 15px;
  color: var(--text-secondary);
}

/* ===== Guide button ===== */
.btn-guide {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  align-self: center;
  margin-left: auto;
  padding: 10px 18px;
  border: 1px solid rgba(108, 140, 255, 0.4);
  border-radius: 8px;
  background: rgba(108, 140, 255, 0.10);
  color: var(--accent);
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease;
}

.btn-guide:hover {
  background: rgba(108, 140, 255, 0.20);
  color: var(--accent-hover);
}

/* ===== Layout spacing ===== */
main {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

/* ===== Dropzone ===== */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 44px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.18s ease, background 0.18s ease;
}

.dropzone:hover,
.dropzone:focus-visible,
.dropzone.dragover {
  border-color: var(--accent);
  background: rgba(108, 140, 255, 0.06);
  outline: none;
}

.dropzone:focus-visible {
  box-shadow: 0 0 0 3px rgba(108, 140, 255, 0.25);
}

.dropzone-icon {
  color: var(--accent);
  margin-bottom: 12px;
}

.dropzone-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.dropzone-sub {
  margin-top: 4px;
  font-size: 13px;
  color: var(--text-secondary);
}

/* ===== Selected file ===== */
.file-name {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--text);
  background: rgba(108, 140, 255, 0.08);
  border: 1px solid rgba(108, 140, 255, 0.25);
  word-break: break-all;
}

.file-name svg {
  flex-shrink: 0;
  color: var(--accent);
}

/* ===== Error ===== */
.error {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 8px;
  font-size: 13px;
  color: #ff9a9a;
  background: rgba(255, 90, 90, 0.08);
  border: 1px solid rgba(255, 90, 90, 0.35);
}

/* ===== Question selector ===== */
.question-box {
  margin-top: 16px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.02);
}

.question-label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.question-input {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #12141c;
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  outline: none;
  transition: border-color 0.18s ease;
}

.question-input::placeholder {
  color: #6b7080;
}

.question-input:focus {
  border-color: var(--accent);
}

.question-hint {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-secondary);
}

/* ===== Buttons ===== */
.btn-generate {
  display: block;
  width: 100%;
  margin-top: 20px;
  padding: 14px 20px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #ffffff;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s ease, transform 0.18s ease;
}

.btn-generate:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-generate:active:not(:disabled) {
  transform: translateY(1px);
}

.btn-generate:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

/* ===== Status / spinner ===== */
.status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 20px;
  border-radius: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 15px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.spinner {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ===== Results grid ===== */
.results {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.018);
}

.panel-header h2 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.panel-content {
  max-height: 500px;
  overflow-y: auto;
  padding: 20px;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}

.panel-empty {
  color: var(--text-secondary);
  font-style: italic;
}

/* Scrollbar */
.panel-content::-webkit-scrollbar {
  width: 10px;
}

.panel-content::-webkit-scrollbar-track {
  background: transparent;
}

.panel-content::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 10px;
}

.panel-content::-webkit-scrollbar-thumb:hover {
  background: #3a3d4a;
}

/* ===== Copy button ===== */
.btn-copy {
  flex-shrink: 0;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.btn-copy:hover {
  background: rgba(255, 255, 255, 0.10);
  color: var(--text);
}

.btn-copy.copied {
  background: rgba(74, 222, 128, 0.12);
  border-color: rgba(74, 222, 128, 0.5);
  color: #4ade80;
}

/* ===== Footer ===== */
.footer {
  margin-top: 32px;
  text-align: center;
}

.small {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ===== Guide video player (liquid glass) ===== */
.player {
  position: fixed;
  inset: 0;
  z-index: 150;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(8, 9, 13, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.player-card {
  position: relative;
  width: 100%;
  max-width: 760px;
  padding: 24px;
  border-radius: 20px;
  /* Liquid glass: translucent body + blurred backdrop + light rim */
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow:
    0 12px 48px rgba(0, 0, 0, 0.55),
    inset 0 1px 0 rgba(255, 255, 255, 0.18),
    inset 0 -1px 0 rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(28px) saturate(160%);
  -webkit-backdrop-filter: blur(28px) saturate(160%);
}

.player-title {
  font-size: 20px;
  font-weight: 700;
  text-align: center;
  margin: 2px 0 18px;
  padding: 0 36px;
  background: linear-gradient(90deg, #e8eaed 0%, #aab6ff 60%, #e8eaed 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.player-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: #e8eaed;
  cursor: pointer;
  transition: background 0.18s ease;
}

.player-close:hover {
  background: rgba(255, 255, 255, 0.20);
}

.player-frame {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  background: #05060a;
  border: 1px solid rgba(255, 255, 255, 0.10);
  /* Hold the 16:9 shape before the (large) video metadata finishes loading,
     so the card doesn't collapse and look unstyled. */
  aspect-ratio: 16 / 9;
}

.player-frame video {
  display: block;
  width: 100%;
  height: 100%;
  background: #05060a;
}

.player-empty {
  padding: 56px 20px;
  text-align: center;
  color: #c9cedd;
}

.player-empty svg {
  color: var(--accent);
  margin-bottom: 12px;
}

.player-empty p {
  font-size: 15px;
  font-weight: 600;
}

.player-empty-sub {
  margin-top: 4px;
  font-size: 13px !important;
  font-weight: 400 !important;
  color: var(--text-secondary);
}

.player-doc {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  margin-top: 16px;
  padding: 12px 18px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  color: #e8eaed;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.18s ease;
}

.player-doc:hover {
  background: rgba(255, 255, 255, 0.18);
}

.player-doc svg {
  color: var(--accent);
  flex-shrink: 0;
}

/* ===== Responsive ===== */
@media (max-width: 700px) {
  body {
    padding: 24px 14px;
  }

  .header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .card {
    padding: 20px;
  }

  .gate-card {
    padding: 24px;
  }

  .results {
    grid-template-columns: 1fr;
  }

  .title {
    font-size: 24px;
  }

  .dropzone {
    padding: 32px 16px;
  }

  .panel-header {
    padding: 14px 16px;
  }

  .panel-content {
    padding: 16px;
    max-height: 400px;
  }
}