:root {
  --dai-navy: #1b3a5c;
  --dai-teal: #007a87;
  --dai-teal-dark: #005c66;
  --ink: #2b2f33;
  --ink-soft: #5a6169;
  --line: #d9dee3;
  --surface: #f4f6f8;
  --white: #ffffff;
  --error: #b3261e;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: "Segoe UI", -apple-system, Arial, sans-serif;
  color: var(--ink);
  background: var(--surface);
  line-height: 1.55;
}

img, video { max-width: 100%; }

/* Header */
header { background: var(--dai-navy); color: var(--white); padding: 0; }
.header-inner { max-width: 960px; margin: 0 auto; padding: 18px 24px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.brand { display: flex; align-items: baseline; gap: 12px; }
.brand .logo { font-size: 1.6rem; font-weight: 700; letter-spacing: 0.04em; }
.brand .divider { opacity: 0.4; }
.brand .site-name { font-size: 1.05rem; font-weight: 400; opacity: 0.9; }
.header-url { font-size: 0.8rem; opacity: 0.6; font-family: Consolas, monospace; }
.accent-bar { height: 4px; background: var(--dai-teal); }

/* Layout */
main { max-width: 960px; margin: 0 auto; padding: 32px 24px 56px; }
.intro h1 { font-size: clamp(1.35rem, 4vw, 1.55rem); color: var(--dai-navy); margin-bottom: 8px; }
.intro p { color: var(--ink-soft); max-width: 640px; }

section, form#report-form { background: var(--white); border: 1px solid var(--line); border-radius: 6px; padding: 24px; margin-top: 24px; }
h2 { font-size: 1.1rem; color: var(--dai-navy); margin-bottom: 12px; padding-bottom: 8px; border-bottom: 2px solid var(--dai-teal); display: inline-block; }

/* Resource link */
.resource-link { display: inline-flex; align-items: center; gap: 10px; padding: 12px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 6px; text-decoration: none; color: var(--dai-teal-dark); font-weight: 600; transition: background 0.15s ease; }
.resource-link:hover, .resource-link:focus-visible { background: #e9eef2; outline: none; }
.resource-link .icon { font-size: 1.3rem; }
.resource-meta { display: block; font-size: 0.8rem; font-weight: 400; color: var(--ink-soft); }

/* Instructional Videos */
.video-intro { color: var(--ink-soft); font-size: 0.9rem; margin-bottom: 16px; max-width: 640px; }
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}
.video-status, .video-empty, .video-error { grid-column: 1 / -1; font-size: 0.9rem; color: var(--ink-soft); }
.video-error { color: var(--error); }

.video-clip {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  background: var(--surface);
  text-decoration: none;
  color: var(--dai-navy);
  transition: box-shadow 0.15s ease, transform 0.15s ease, border-color 0.15s ease;
}
.video-clip:hover, .video-clip:focus-visible {
  outline: none;
  border-color: var(--dai-teal);
  box-shadow: 0 4px 14px rgba(27, 58, 92, 0.18);
  transform: translateY(-2px);
}
.video-clip:focus-visible { outline: 2px solid var(--dai-teal); outline-offset: 2px; }

.video-thumb {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.video-thumb video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  background: #000;
  pointer-events: none;
}
.video-play {
  position: absolute;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(27, 58, 92, 0.72);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  padding-left: 4px;
  transition: background 0.15s ease, transform 0.15s ease;
}
.video-clip:hover .video-play, .video-clip:focus-visible .video-play {
  background: var(--dai-teal);
  transform: scale(1.08);
}
.video-title {
  padding: 10px 12px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--dai-navy);
  word-break: break-word;
}

.video-caption { font-size: 0.85rem; color: var(--ink-soft); margin-top: 8px; }

/* Progressive Form Steps */
.form-step { padding-bottom: 24px; border-bottom: 1px solid var(--line); transition: opacity 0.3s ease, filter 0.3s ease; }
.form-step:last-child { border-bottom: none; padding-bottom: 0; }

/* Disabled state (default for steps 2 & 3) */
.form-step.disabled {
  opacity: 0.45;
  pointer-events: none;
  filter: grayscale(0.6);
}

/* Active/Enabled state */
.form-step.active, .form-step.enabled {
  opacity: 1;
  pointer-events: auto;
  filter: none;
}

label { display: block; font-weight: 600; font-size: 0.9rem; margin-bottom: 6px; color: var(--ink); }
.required::after { content: " *"; color: var(--error); }

input[type="email"], input[type="text"], select, textarea { width: 100%; max-width: 560px; padding: 10px 12px; font-size: 0.95rem; font-family: inherit; border: 1px solid var(--line); border-radius: 4px; background: var(--white); color: var(--ink); }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--dai-teal); outline-offset: 1px; border-color: var(--dai-teal); }
textarea { min-height: 140px; resize: vertical; }
.hint { font-size: 0.8rem; color: var(--ink-soft); margin-top: 4px; }

button[type="submit"], #send-code-btn, #verify-btn { padding: 11px 28px; font-size: 0.95rem; font-weight: 600; font-family: inherit; border-radius: 4px; cursor: pointer; transition: background 0.15s ease, opacity 0.2s ease; }
button[type="submit"] { color: var(--white); background: var(--dai-teal); border: none; margin-top: 8px; }
#send-code-btn, #verify-btn { background: transparent; color: var(--dai-teal-dark); border: 1px solid var(--line); margin-top: 10px; }

button[type="submit"]:hover:not(:disabled), button[type="submit"]:focus-visible,
#send-code-btn:hover:not(:disabled):not(.loading), #verify-btn:hover:not(:disabled):not(.loading) { filter: brightness(0.92); }
#send-code-btn:focus-visible, #verify-btn:focus-visible { outline: 2px solid var(--dai-teal); outline-offset: 1px; border-color: var(--dai-teal); }

button[type="submit"]:disabled, button.loading { opacity: 0.65; cursor: not-allowed; filter: none !important; }

.confirmation { margin-top: 24px; padding: 12px 16px; border-radius: 4px; font-size: 0.9rem; max-width: 560px; display: none; }
.confirmation.visible { display: block; background: #e7f4ec; border: 1px solid #9ed0b0; color: #1e5c37; }
.confirmation.error { background: #fde8e8; border-color: #f5c6cb; color: var(--error); }

footer { border-top: 1px solid var(--line); background: var(--white); padding: 20px 24px; text-align: center; font-size: 0.8rem; color: var(--ink-soft); margin-top: 32px; }

/* Attachments */
.optional-tag { font-weight: 400; color: var(--ink-soft); font-size: 0.8rem; }
.attach-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 10px; }
.attach-btn {
  padding: 9px 16px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--dai-teal-dark);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s ease, filter 0.15s ease;
}
.attach-btn:hover:not(:disabled) { filter: brightness(0.96); border-color: var(--dai-teal); }
.attach-btn:focus-visible { outline: 2px solid var(--dai-teal); outline-offset: 1px; border-color: var(--dai-teal); }
.attach-btn:disabled { opacity: 0.65; cursor: not-allowed; }

.attachment-list { list-style: none; padding: 0; margin: 0 0 8px; max-width: 560px; }
.attachment-list:empty { display: none; }
.attachment-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  margin-bottom: 6px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 4px;
  font-size: 0.85rem;
}
.attachment-item .att-thumb { width: 34px; height: 34px; object-fit: cover; border-radius: 3px; border: 1px solid var(--line); flex-shrink: 0; }
.attachment-item .att-icon { width: 34px; height: 34px; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; flex-shrink: 0; }
.attachment-item .att-meta { flex: 1; min-width: 0; }
.attachment-item .att-name { display: block; font-weight: 600; color: var(--ink); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.attachment-item .att-size { display: block; font-size: 0.75rem; color: var(--ink-soft); }
.attachment-item .att-remove {
  border: none;
  background: transparent;
  color: var(--error);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 3px;
  flex-shrink: 0;
}
.attachment-item .att-remove:hover { background: #fde8e8; }
.attachment-item .att-remove:focus-visible { outline: 2px solid var(--dai-teal); outline-offset: 1px; }

/* ---------- Responsive breakpoints ---------- */

/* Tablets and small laptops */
@media (max-width: 768px) {
  main { padding: 24px 18px 44px; }
  section, form#report-form { padding: 20px; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 14px; }
}

/* Phones */
@media (max-width: 600px) {
  .header-inner { flex-direction: column; align-items: flex-start; }
  input[type="email"], input[type="text"], select, textarea { max-width: 100%; }
  main { padding: 20px 14px 40px; }
  section, form#report-form { padding: 16px; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
  .video-play { width: 44px; height: 44px; font-size: 0.95rem; }
  .attach-actions { flex-direction: column; align-items: stretch; }
  .attach-btn { width: 100%; }
  button[type="submit"], #send-code-btn, #verify-btn { width: 100%; }
}

/* Very small phones — single column of clips */
@media (max-width: 380px) {
  .video-grid { grid-template-columns: 1fr; }
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
  .video-clip:hover, .video-clip:focus-visible { transform: none; }
}