:root {
  --bg: #060b13;
  --panel: rgba(11, 23, 37, 0.72);
  --text: #d9fff6;
  --muted: #83b9ac;
  --line: rgba(77, 255, 219, 0.2);
  --accent: #37ffd1;
  --accent-2: #38c8ff;
  --shadow: 0 0 25px rgba(56, 200, 255, 0.25);
}

body.light {
  --bg: #e6f5ff;
  --panel: rgba(255, 255, 255, 0.72);
  --text: #081824;
  --muted: #3b5f6e;
  --line: rgba(8, 24, 36, 0.15);
  --accent: #008f73;
  --accent-2: #0072a5;
  --shadow: 0 0 22px rgba(0, 114, 165, 0.2);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Space Grotesk', sans-serif;
  background: radial-gradient(circle at 20% 10%, rgba(56, 200, 255, 0.2), transparent 35%), radial-gradient(circle at 80% 75%, rgba(55, 255, 209, 0.2), transparent 40%), var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, .brand, .eyebrow, .status-tag, .chat-header { font-family: 'Share Tech Mono', monospace; letter-spacing: 0.03em; }

.progress-bar { position: fixed; top: 0; left: 0; width: 0; height: 4px; background: linear-gradient(90deg, var(--accent-2), var(--accent)); z-index: 1000; box-shadow: var(--shadow); }

.loader { position: fixed; inset: 0; background: #02060f; display: grid; place-items: center; z-index: 1100; transition: opacity 0.45s ease, visibility 0.45s ease; }
.loader.hidden { opacity: 0; visibility: hidden; }
.loader-panel { width: min(420px, 90vw); padding: 1.5rem; border: 1px solid var(--line); background: rgba(0, 0, 0, 0.4); box-shadow: var(--shadow); }
.loader-title, .loader-text { margin: 0 0 0.8rem; color: var(--muted); }
.loader-bar { width: 100%; height: 10px; border: 1px solid var(--line); }
.loader-bar span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--accent-2), var(--accent)); transition: width 0.25s ease; }

.scanlines { position: fixed; inset: 0; pointer-events: none; z-index: 1; background-image: linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px); background-size: 100% 4px; mix-blend-mode: soft-light; }
.cursor-glow { position: fixed; width: 190px; height: 190px; border-radius: 50%; background: radial-gradient(circle, rgba(56, 200, 255, 0.22), transparent 68%); pointer-events: none; z-index: 2; transform: translate(-50%, -50%); }

.glass { background: var(--panel); backdrop-filter: blur(8px); border: 1px solid var(--line); box-shadow: var(--shadow); }

.top-nav {
  position: fixed; top: 1rem; left: 50%; transform: translateX(-50%); width: min(1100px, calc(100% - 2rem));
  display: flex; justify-content: space-between; align-items: center; padding: 0.8rem 1rem; border-radius: 12px; z-index: 100;
}
.brand { margin: 0; color: var(--accent); }
.nav-actions { display: flex; align-items: center; gap: 0.6rem; }

.ghost-btn, .toggle-btn, .cta-btn, .chat-input-row button {
  border: 1px solid var(--line); background: transparent; color: var(--text); padding: 0.55rem 0.9rem; cursor: pointer; transition: 0.25s ease;
  height: 40px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  white-space: nowrap;
}

.ghost-btn:hover, .toggle-btn:hover, .cta-btn:hover, .toggle-btn.active, .chat-input-row button:hover {
  color: #00151f; background: linear-gradient(90deg, var(--accent-2), var(--accent)); box-shadow: var(--shadow);
}

main { position: relative; z-index: 3; }

.hero { min-height: 100vh; padding: 8rem 1rem 2rem; display: grid; place-items: center; position: relative; }
#heroCanvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-content { position: relative; text-align: center; max-width: 100%; }
.eyebrow { color: var(--accent); margin-bottom: 0.9rem; }
.hero h1 { font-size: clamp(2.1rem, 8.2vw, 7.8rem); margin: 0 0 0.45rem; line-height: 0.95; letter-spacing: 0.04em; text-transform: lowercase; white-space: nowrap; }
.hero-sub { color: var(--muted); margin: 0 0 1.6rem; }
.hero-batch { font-size: clamp(1rem, 2.5vw, 1.8rem); letter-spacing: 0.14em; text-transform: lowercase; margin-bottom: 0; }
.cta-btn { padding: 0.8rem 1.4rem; }

.section { width: min(1100px, calc(100% - 2rem)); margin: 0 auto; padding: 3.5rem 0; }
.section h2 { font-size: clamp(1.5rem, 2.8vw, 2.3rem); margin: 0 0 0.9rem; }
.system-log { padding: 1rem; border: 1px solid var(--line); border-left: 3px solid var(--accent); color: var(--muted); }

.module-grid { margin-top: 1.2rem; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.module-card, .student-card {
  border: 1px solid var(--line); background: rgba(6, 15, 24, 0.7); padding: 1rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease; transform-style: preserve-3d;
}
body.light .module-card, body.light .student-card { background: rgba(255, 255, 255, 0.7); }
.module-card:hover, .student-card:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: var(--shadow); }
.status-tag { display: inline-block; margin-top: 1rem; padding: 0.3rem 0.55rem; font-size: 0.75rem; border: 1px solid var(--line); color: var(--accent); }

.section-head p { margin-top: 0; color: var(--muted); }
.control-panel { padding: 1rem; border-radius: 12px; display: grid; gap: 0.85rem; }
.view-toggle, .filters { display: flex; flex-wrap: wrap; gap: 0.65rem; }
.filters input, .filters select, .chat-input-row input { background: transparent; color: var(--text); border: 1px solid var(--line); padding: 0.6rem 0.7rem; min-width: 160px; }

.students-grid { margin-top: 1.2rem; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.students-grid.scroll-mode { display: flex; overflow-x: auto; gap: 1rem; scroll-snap-type: x mandatory; padding-bottom: 0.4rem; }
.students-grid.scroll-mode .student-card { min-width: 290px; scroll-snap-align: start; }

.student-image { width: 100%; height: 200px; object-fit: cover; border: 1px solid var(--line); }
.student-meta { display: flex; justify-content: space-between; align-items: center; gap: 0.6rem; margin: 0.8rem 0 0.45rem; }
.student-name { margin: 0; }
.student-role { margin: 0; color: var(--muted); font-size: 0.93rem; }
.indicator { width: 10px; height: 10px; border-radius: 50%; box-shadow: 0 0 12px currentColor; }
.indicator.online { color: #67ff93; background: currentColor; }
.indicator.offline { color: #808f95; background: currentColor; }

.connect-links { display: flex; flex-wrap: wrap; gap: 0.7rem; }
.connect-links a, .modal-links a { text-decoration: none; color: var(--text); border: 1px solid var(--line); padding: 0.6rem 0.8rem; }
.connect-links a:hover, .modal-links a:hover { background: linear-gradient(90deg, var(--accent-2), var(--accent)); color: #00151f; box-shadow: var(--shadow); }

.modal { position: fixed; inset: 0; background: rgba(2, 8, 13, 0.75); display: none; place-items: center; padding: 1rem; z-index: 300; }
.modal.open { display: grid; }
.modal-panel { width: min(560px, 100%); padding: 1rem; position: relative; border-radius: 14px; }
.close-modal { position: absolute; top: 0.65rem; right: 0.65rem; border: 1px solid var(--line); background: transparent; color: var(--text); width: 32px; height: 32px; cursor: pointer; }
.modal-panel img { width: 100%; max-height: 260px; object-fit: cover; border: 1px solid var(--line); }
.modal-role { color: var(--muted); }
.modal-links { display: flex; flex-wrap: wrap; gap: 0.6rem; }

.chat-widget { position: fixed; right: 1rem; bottom: 1rem; z-index: 250; }
.chat-toggle { width: 130px; padding: 0.7rem 0.85rem; border: 1px solid var(--line); background: rgba(5, 12, 20, 0.9); color: var(--accent); cursor: pointer; box-shadow: var(--shadow); }
.chat-panel { margin-top: 0.55rem; width: min(340px, calc(100vw - 2rem)); border-radius: 12px; overflow: hidden; }
.chat-panel.hidden { display: none; }
.chat-header { padding: 0.65rem 0.8rem; border-bottom: 1px solid var(--line); color: var(--accent); }
.chat-messages { height: 210px; overflow-y: auto; padding: 0.8rem; display: flex; flex-direction: column; gap: 0.5rem; }
.chat-msg { padding: 0.45rem 0.55rem; border: 1px solid var(--line); font-size: 0.9rem; }
.chat-msg.user { align-self: flex-end; border-color: rgba(56, 200, 255, 0.4); }
.chat-msg.ai { align-self: flex-start; border-color: rgba(55, 255, 209, 0.4); }
.chat-input-row { display: flex; border-top: 1px solid var(--line); }
.chat-input-row input { flex: 1; border: 0; min-width: 0; }
.chat-input-row button { border: 0; border-left: 1px solid var(--line); }

.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.55s ease, transform 0.55s ease; }
.reveal.visible { opacity: 1; transform: none; }

@media (max-width: 900px) {
  .module-grid, .students-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 700px) {
  .top-nav { position: sticky; top: 0; border-radius: 0; width: 100%; transform: none; left: 0; }
  .module-grid, .students-grid { grid-template-columns: 1fr; }
  .students-grid.scroll-mode { display: grid; overflow: visible; }
  .students-grid.scroll-mode .student-card { min-width: 0; }
  .hero h1 { white-space: normal; }
  .dashboard-actions { grid-template-columns: 1fr; }
  .planner-form { grid-template-columns: 1fr; }
}

.profile-wrap {
  position: relative;
}

.profile-icon-btn {
  width: 40px;
  min-width: 40px;
  padding: 0;
}

.profile-icon-btn svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.profile-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 0.5rem);
  width: min(460px, 94vw);
  padding: 0.8rem;
  border-radius: 10px;
  z-index: 220;
}

.profile-heading {
  margin: 0 0 0.6rem;
  color: var(--accent);
}

.profile-form,
.edit-form {
  display: grid;
  gap: 0.55rem;
}

.profile-form input,
.edit-form input,
.edit-form textarea,
.edit-form select {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text);
  padding: 0.6rem;
  font-family: inherit;
}

.edit-form textarea {
  resize: vertical;
}

.profile-name {
  margin: 0;
  font-weight: 700;
}

.profile-role {
  margin: 0.35rem 0 0.8rem;
  color: var(--muted);
}

.profile-hint {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.dashboard-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.45rem;
  margin: 0.6rem 0 0.35rem;
}

.student-tools {
  margin-top: 0.85rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--line);
}

.planner-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.45rem;
}

.planner-form input {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text);
  padding: 0.55rem;
}

.planner-list {
  margin: 0.65rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.4rem;
}

.planner-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.45rem;
  padding: 0.45rem 0.5rem;
  border: 1px solid var(--line);
}

.planner-item.done .planner-text {
  text-decoration: line-through;
  opacity: 0.7;
}

.planner-text {
  font-size: 0.88rem;
}

.planner-item button {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  padding: 0.3rem 0.45rem;
  cursor: pointer;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.auth-error {
  margin: 0.45rem 0;
  color: #ff8080;
  min-height: 1rem;
  font-size: 0.88rem;
}

.edit-btn {
  margin-top: 0.7rem;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--accent);
  padding: 0.45rem 0.65rem;
  cursor: pointer;
}

.edit-btn:hover {
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  color: #00151f;
}

.hidden {
  display: none !important;
}