/* ═══════════════════════════════════════════════
   LaTeX Studio — Main Stylesheet
   Aesthetic: Dark editorial, print-inspired
═══════════════════════════════════════════════ */

:root {
  --bg: #0f0f0f;
  --bg2: #161616;
  --bg3: #1e1e1e;
  --bg4: #252525;
  --border: #2a2a2a;
  --border2: #333;
  --text: #e8e4dc;
  --text2: #9a9590;
  --text3: #5a5550;
  --accent: #c8a96e;
  --accent2: #a08050;
  --accent-glow: rgba(200, 169, 110, 0.15);
  --green: #4caf7d;
  --red: #e05252;
  --blue: #5b8fd4;
  --radius: 6px;
  --radius2: 10px;
  --font-sans: 'DM Sans', system-ui, sans-serif;
  --font-serif: 'DM Serif Display', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --shadow: 0 4px 24px rgba(0,0,0,0.5);
  --shadow2: 0 2px 8px rgba(0,0,0,0.4);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ─── SCROLLBAR ─── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text3); }

/* ─── NAV ─── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  height: 60px;
  background: rgba(15,15,15,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text);
}

.nav-logo {
  font-size: 20px;
  color: var(--accent);
}

.nav-name {
  font-family: var(--font-sans);
  font-size: 17px;
  letter-spacing: -0.3px;
}

.nav-name strong { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  color: var(--text2);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-link:hover, .nav-link.active { color: var(--text); }

.nav-auth {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ─── BUTTONS ─── */
.btn-primary {
  background: var(--accent);
  color: #0f0f0f;
  border: none;
  padding: 10px 22px;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.2px;
}

.btn-primary:hover {
  background: #d4b87a;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(200,169,110,0.3);
}

.btn-primary.full { width: 100%; justify-content: center; }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border2);
  padding: 10px 22px;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 13px;
}

/* ─── HERO ─── */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 80px 40px;
  max-width: 1200px;
  margin: 0 auto;
}

.hero-eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 56px;
  line-height: 1.1;
  color: var(--text);
  margin-bottom: 20px;
}

.hero-title em {
  font-style: italic;
  color: var(--accent);
}

.hero-sub {
  font-size: 17px;
  color: var(--text2);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 440px;
}

.hero-actions {
  display: flex;
  gap: 12px;
}

/* CODE PREVIEW */
.code-preview {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius2);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.code-toolbar {
  display: flex;
  gap: 6px;
  padding: 12px 16px;
  background: var(--bg4);
  border-bottom: 1px solid var(--border);
}

.code-toolbar span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border2);
}

.code-toolbar span:nth-child(1) { background: #ff5f57; }
.code-toolbar span:nth-child(2) { background: #febc2e; }
.code-toolbar span:nth-child(3) { background: #28c840; }

.code-sample {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  padding: 20px;
  color: var(--text2);
  white-space: pre;
  overflow-x: auto;
}

/* ─── GALLERY SECTION ─── */
.gallery-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px 80px;
}

.filters {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--bg2);
  color: var(--text2);
  border: 1px solid var(--border);
  padding: 7px 18px;
  border-radius: 100px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn:hover { border-color: var(--accent); color: var(--accent); }
.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #0f0f0f;
}

/* TEMPLATE GRID */
.template-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.template-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius2);
  overflow: hidden;
  cursor: pointer;
  transition: all 0.25s;
  position: relative;
}

.template-card:hover {
  border-color: var(--accent2);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

.template-preview {
  aspect-ratio: 4/3;
  background: var(--bg3);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  position: relative;
}

.template-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.template-preview-code {
  font-family: var(--font-mono);
  font-size: 9px;
  line-height: 1.6;
  color: var(--text3);
  padding: 16px;
  white-space: pre;
  overflow: hidden;
  pointer-events: none;
  user-select: none;
}

.card-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 3px 8px;
  border-radius: 100px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.badge-public { background: rgba(76,175,125,0.2); color: var(--green); border: 1px solid rgba(76,175,125,0.3); }
.badge-private { background: rgba(91,143,212,0.2); color: var(--blue); border: 1px solid rgba(91,143,212,0.3); }

.template-info {
  padding: 16px;
}

.template-category {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}

.template-name {
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--text);
  margin-bottom: 6px;
  line-height: 1.3;
}

.template-desc {
  font-size: 13px;
  color: var(--text2);
  line-height: 1.5;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.template-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.template-tags {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.tag {
  background: var(--bg4);
  color: var(--text3);
  padding: 2px 8px;
  border-radius: 100px;
  font-size: 11px;
}

.template-uses {
  font-size: 12px;
  color: var(--text3);
}

.card-actions {
  display: flex;
  gap: 8px;
  padding: 0 16px 16px;
}

.card-btn {
  flex: 1;
  padding: 8px;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text2);
}

.card-btn:hover { border-color: var(--accent); color: var(--accent); }
.card-btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #0f0f0f;
}
.card-btn.primary:hover { background: #d4b87a; }

/* ─── MODALS ─── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal {
  background: var(--bg2);
  border: 1px solid var(--border2);
  border-radius: var(--radius2);
  padding: 32px;
  width: 100%;
  max-width: 440px;
  position: relative;
  box-shadow: var(--shadow);
  max-height: 90vh;
  overflow-y: auto;
}

.modal-wide { max-width: 680px; }

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  color: var(--text2);
  font-size: 16px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius);
  transition: all 0.2s;
}

.modal-close:hover { background: var(--bg3); color: var(--text); }

.modal-desc {
  font-size: 13px;
  color: var(--text2);
  margin-bottom: 20px;
  line-height: 1.5;
}

.modal-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.modal-tab {
  background: none;
  border: none;
  padding: 10px 20px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--text2);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all 0.2s;
}

.modal-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.modal-tab:hover { color: var(--text); }

.auth-form { display: none; }
.auth-form.active { display: block; }
.auth-form h2 {
  font-family: var(--font-serif);
  font-size: 22px;
  margin-bottom: 20px;
  color: var(--text);
}

/* ─── FORM FIELDS ─── */
.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text2);
  margin-bottom: 6px;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border2);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text);
  transition: border-color 0.2s;
  outline: none;
}

.field textarea {
  font-family: var(--font-mono);
  font-size: 12px;
  resize: vertical;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--accent);
  background: var(--bg4);
}

.field input::placeholder,
.field textarea::placeholder { color: var(--text3); }

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.form-error {
  color: var(--red);
  font-size: 13px;
  margin-bottom: 12px;
  min-height: 18px;
}

.form-hint {
  text-align: center;
  font-size: 12px;
  color: var(--text3);
  margin-top: 12px;
}

/* FILE DROP */
.file-drop {
  border: 2px dashed var(--border2);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 13px;
  color: var(--text3);
}

.file-drop:hover { border-color: var(--accent); color: var(--accent); }

/* ─── LOADING ─── */
.loading-state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 60px;
  gap: 16px;
  color: var(--text2);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 2px solid var(--border2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner.large { width: 48px; height: 48px; }

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

/* ─── EMPTY STATE ─── */
.empty-state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 60px;
  gap: 12px;
  color: var(--text2);
  text-align: center;
}

.empty-state p { font-size: 15px; }
.empty-state small { color: var(--text3); font-size: 13px; }

/* ─── TOAST ─── */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg4);
  border: 1px solid var(--border2);
  border-radius: var(--radius);
  padding: 12px 20px;
  font-size: 14px;
  color: var(--text);
  z-index: 9999;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.34,1.56,0.64,1);
  pointer-events: none;
  max-width: 320px;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast.success { border-left: 3px solid var(--green); }
.toast.error { border-left: 3px solid var(--red); }

/* ─── USER CHIP ─── */
.user-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 5px 12px 5px 6px;
  font-size: 13px;
  color: var(--text2);
}

.user-avatar {
  width: 24px;
  height: 24px;
  background: var(--accent);
  color: #0f0f0f;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
}

.user-chip button {
  background: none;
  border: none;
  color: var(--text3);
  cursor: pointer;
  font-size: 13px;
  padding: 0 0 0 8px;
  margin-left: 4px;
  border-left: 1px solid var(--border);
  transition: color 0.2s;
}

.user-chip button:hover { color: var(--red); }

/* ─── UPLOAD TAB CONTENT ─── */
.upload-tab-content { display: none; }
.upload-tab-content.active { display: block; }

/* ─── RESPONSIVE ─── */
@media (max-width: 768px) {
  .nav { padding: 0 20px; }
  .hero { grid-template-columns: 1fr; padding: 40px 20px; gap: 32px; }
  .hero-title { font-size: 38px; }
  .hero-visual { display: none; }
  .gallery-section { padding: 0 20px 60px; }
  .field-row { grid-template-columns: 1fr; }
}