/* ===== Top Navigation Bar — Sage Theme ===== */

/* Nav-specific colors — NOT inherited from page CSS to avoid conflicts.
   Pages define their own --primary-dark etc. which would override the nav bar color.
   These --nav-* vars are only defined here, so the nav bar always looks right. */
:root {
  --nav-bg: #4C9948;
  --nav-bg-dark: #0B150B;
  --nav-active: #62B85E;
  --nav-text: rgba(255,255,255,0.8);
  --nav-text-active: #FFFFFF;
  --nav-brand: #FFFFFF;
}

.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--nav-bg);
  border-bottom: none;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  height: 56px;
  display: flex;
  align-items: center;
}

@media (prefers-color-scheme: dark) {
  .top-nav {
    background: var(--nav-bg-dark);
    box-shadow: 0 2px 8px rgba(0,0,0,0.4);
  }
}

.nav-inner {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  height: 100%;
}

/* Brand */
.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: #FFFFFF;
  text-decoration: none;
  white-space: nowrap;
  letter-spacing: -0.02em;
}
.nav-brand:hover { opacity: 0.85; }

/* Desktop tabs */
.nav-tabs {
  display: flex;
  gap: 2px;
  align-items: center;
}
.nav-tab {
  padding: 6px 12px;
  font-size: 0.85rem;
  font-weight: 500;
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  border-radius: 8px;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}
.nav-tab:hover { background: rgba(255,255,255,0.1); color: #FFFFFF; }
.nav-tab.active { background: var(--nav-active, #2D6A4F); color: var(--nav-text-active); }

/* Mobile shortcut tabs — hidden on desktop, shown on narrow screens */
.nav-tabs-mobile { display: none; gap: 2px; align-items: center; }
.nav-tab-mobile {
  padding: 6px 10px;
  font-size: 0.82rem;
  font-weight: 500;
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  border-radius: 8px;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}
.nav-tab-mobile:hover { background: rgba(255,255,255,0.1); color: #FFFFFF; }
.nav-tab-mobile.active { background: var(--nav-active, #2D6A4F); color: var(--nav-text-active); }

/* Search */
.nav-search-wrap {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.nav-search-form {
  display: flex;
  align-items: center;
  background: var(--bg-input, #f9fafb);
  border: 1px solid var(--border, #e5e7eb);
  border-radius: 20px;
  padding: 0;
  transition: width 0.2s ease-in-out, border-color 0.15s, box-shadow 0.15s;
  overflow: hidden;
}
.nav-search-form:focus-within {
  border-color: var(--nav-active, #2D6A4F);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}
@media (prefers-color-scheme: dark) {
  .nav-search-form {
    background: var(--bg-input, #2d2d44);
    border-color: var(--border, #3d3d55);
  }
}
.nav-search {
  border: none;
  background: transparent;
  padding: 6px 12px 6px 16px;
  font-size: 0.85rem;
  width: 180px;
  outline: none;
  color: var(--text-dark, #2A4A28);
  border-radius: 20px;
  transition: width 0.2s ease-in-out, opacity 0.2s, padding 0.2s;
}
.nav-search::placeholder { color: var(--text-muted, #9ca3af); }
@media (prefers-color-scheme: dark) { .nav-search { color: #FFFFFF; } }
.nav-search-btn {
  border: none;
  background: transparent;
  padding: 6px 12px;
  font-size: 0.9rem;
  cursor: pointer;
  color: rgba(255,255,255,0.7);
  border-radius: 0 20px 20px 0;
  flex-shrink: 0;
}
.nav-search-btn:hover { color: #FFFFFF; }

/* Collapsed search (narrow screens) */
.nav-search-form.collapsed { width: 36px; min-width: 36px; }
.nav-search-form.collapsed .nav-search { width: 0; padding: 0; opacity: 0; pointer-events: none; }
.nav-search-form.collapsed .nav-search-btn { padding: 6px 8px; }
.nav-search-form.expanded {
  width: 220px;
  position: absolute;
  right: 16px;
  top: 10px;
  z-index: 1001;
  box-shadow: 0 4px 12px rgba(0,0,0,0.25);
}
.nav-search-form.expanded .nav-search { width: auto; flex: 1; opacity: 1; padding: 6px 12px 6px 16px; }

/* Scan button */
.nav-scan-btn {
  border: 1px solid var(--border, #e5e7eb);
  background: var(--bg-card, #ffffff);
  padding: 6px 10px;
  font-size: 1rem;
  cursor: pointer;
  border-radius: 10px;
  flex-shrink: 0;
  transition: background 0.15s, border-color 0.15s;
}
.nav-scan-btn:hover { border-color: var(--nav-active, #2D6A4F); }
@media (prefers-color-scheme: dark) {
  .nav-scan-btn { background: var(--bg-card, #2d2d44); border-color: var(--border, #3d3d55); }
}

/* User/account button (replaces auth button) */
.nav-user-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  border: 1px solid rgba(255,255,255,0.25);
  background: transparent;
  color: #FFFFFF;
  padding: 6px 10px;
  font-size: 0.82rem;
  font-weight: 500;
  border-radius: 20px;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background 0.15s, border-color 0.15s;
}
.nav-user-btn:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.4); }
.nav-user-btn.signed-in { border-color: var(--nav-active, #2D6A4F); background: rgba(79,70,229,0.15); }
.nav-user-icon { font-size: 1rem; }
.nav-user-label { display: inline; }
@media (max-width: 480px) { .nav-user-label { display: none; } }

/* Auth modal */
.auth-overlay[hidden] { display: none !important; }
.auth-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5); z-index: 2500;
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.auth-modal {
  background: var(--bg-card, #ffffff);
  border-radius: 16px;
  max-width: 400px; width: 100%;
  padding: 32px 28px;
  position: relative;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
@media (prefers-color-scheme: dark) { .auth-modal { background: var(--bg-card, #1a1a2e); } }
.auth-close {
  position: absolute; top: 12px; right: 12px;
  border: none; background: transparent;
  font-size: 1.2rem; cursor: pointer;
  color: var(--text-secondary, #6b7280);
  padding: 4px 10px; border-radius: 6px;
}
.auth-close:hover { background: var(--bg-hover, #f3f4f6); }
.auth-tabs {
  display: flex; gap: 0; margin-bottom: 20px;
  border-bottom: 2px solid var(--border, #e5e7eb);
}
.auth-tab {
  flex: 1; padding: 10px; border: none; background: transparent;
  font-size: 0.95rem; font-weight: 500;
  color: var(--text-secondary, #6b7280);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color 0.15s, border-color 0.15s;
}
.auth-tab.active { color: var(--nav-active, #2D6A4F); border-bottom-color: var(--nav-active, #2D6A4F); }
.auth-error {
  color: #dc2626; background: #fef2f2;
  padding: 10px 14px; border-radius: 8px;
  font-size: 0.85rem; margin-bottom: 12px;
}
.auth-input {
  width: 100%; padding: 12px 16px;
  border: 2px solid var(--border, #e5e7eb);
  border-radius: 10px; margin-bottom: 12px;
  font-size: 1rem; box-sizing: border-box;
  background: var(--bg-input, #f9fafb);
  color: var(--text-primary, #111827);
}
.auth-input:focus { outline: none; border-color: var(--nav-active, #2D6A4F); }
.auth-submit { width: 100%; margin-bottom: 10px; }
.auth-magic { width: 100%; margin-bottom: 16px; }
.auth-legal { text-align: center; font-size: 0.78rem; color: var(--text-muted, #9ca3af); margin: 0; }
.auth-legal a { color: var(--nav-active, #2D6A4F); }

/* Mobile menu toggle */
.nav-menu-toggle {
  display: none;
  border: none; background: transparent;
  font-size: 1.3rem; cursor: pointer;
  color: #FFFFFF;
  padding: 4px 8px;
}

/* Body padding */
body { padding-top: 56px !important; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .nav-search { width: 140px; }
  .nav-tab { padding: 6px 8px; font-size: 0.8rem; }
}

@media (max-width: 768px) {
  /* Hide desktop tabs, show mobile shortcut tabs */
  .nav-tabs { display: none; }
  .nav-tabs-mobile { display: flex; }
  /* Collapse search to icon */
  .nav-search-form { width: 36px; min-width: 36px; }
  .nav-search-form .nav-search { width: 0; padding: 0; opacity: 0; pointer-events: none; }
  .nav-search-form .nav-search-btn { padding: 6px 8px; }
  .nav-scan-btn { display: none; }
}

/* Dropdown menu (☰) — dark text on light background */
@media (max-width: 768px) {
  .nav-tabs.open {
    display: flex;
    position: absolute;
    top: 56px; left: 0; right: 0;
    background: var(--bg-card, #ffffff);
    border-bottom: 1px solid var(--border, #e5e7eb);
    flex-direction: column;
    padding: 8px 16px;
    gap: 4px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  }
  .nav-tabs.open .nav-tab {
    padding: 12px 14px;
    border-radius: 8px;
    width: 100%;
    text-align: left;
    color: var(--text-primary, #111827);
    font-size: 0.95rem;
  }
  .nav-tabs.open .nav-tab:hover { background: var(--bg-hover, #f3f4f6); color: var(--text-primary, #111827); }
  .nav-tabs.open .nav-tab.active { background: var(--nav-active, #2D6A4F); color: var(--nav-text-active); }
  .nav-menu-toggle { display: block; }
}

@media (max-width: 480px) {
  .nav-brand { font-size: 0.95rem; }
}

/* ===== Scan Popup ===== */
.scan-overlay[hidden] { display: none !important; }
.scan-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5); z-index: 2000;
  display: flex; align-items: flex-start; justify-content: center;
  padding: 20px; overflow-y: auto;
}
.scan-popup {
  background: var(--bg-card, #ffffff);
  border-radius: 12px; max-width: 700px; width: 100%;
  margin-top: 40px; box-shadow: 0 20px 60px rgba(0,0,0,0.2); overflow: hidden;
}
@media (prefers-color-scheme: dark) { .scan-popup { background: var(--bg-card, #1a1a2e); } }
.scan-popup-header { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--border, #e5e7eb); }
.scan-popup-header h2 { margin: 0; font-size: 1.2rem; }
.scan-close { border: none; background: transparent; font-size: 1.2rem; cursor: pointer; color: var(--text-secondary, #6b7280); padding: 4px 8px; border-radius: 6px; }
.scan-close:hover { background: var(--bg-hover, #f3f4f6); }
.scan-body { padding: 20px; }
.scan-options { display: flex; gap: 16px; justify-content: center; padding: 20px 0; }
.scan-option-btn { display: flex; flex-direction: column; align-items: center; gap: 8px; padding: 20px 24px; border: 2px dashed var(--border, #e5e7eb); background: var(--bg-input, #f9fafb); border-radius: 12px; cursor: pointer; font-size: 0.9rem; color: var(--text-primary, #111827); transition: border-color 0.15s, background 0.15s; }
.scan-option-btn:hover { border-color: var(--nav-active, #2D6A4F); background: rgba(79, 70, 229, 0.05); }
.scan-icon { font-size: 2rem; }
.scan-preview-wrap { margin-top: 16px; text-align: center; position: relative; }
.scan-preview-wrap img { max-width: 100%; border-radius: 8px; border: 1px solid var(--border, #e5e7eb); }
.scan-processing { position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: rgba(255,255,255,0.85); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; border-radius: 8px; }
@media (prefers-color-scheme: dark) { .scan-processing { background: rgba(26,26,46,0.85); } }
.scan-spinner { width: 32px; height: 32px; border: 3px solid var(--border, #e5e7eb); border-top-color: var(--nav-active, #2D6A4F); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.scan-camera-controls { display: flex; gap: 12px; justify-content: center; margin-top: 12px; }
.scan-capture-btn, .scan-cancel-btn { padding: 10px 24px; border: none; border-radius: 8px; font-size: 0.9rem; cursor: pointer; }
.scan-capture-btn { background: var(--nav-active, #2D6A4F); color: var(--nav-text-active); }
.scan-capture-btn:hover { opacity: 0.9; }
.scan-cancel-btn { background: var(--bg-hover, #f3f4f6); color: var(--text-primary, #111827); }
.scan-results-header { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.scan-results-header h3 { margin: 0; font-size: 1.05rem; }
.scan-results-controls { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.scan-level-filter { padding: 4px 8px; border-radius: 6px; border: 1px solid var(--border, #e5e7eb); background: var(--bg-input, #f9fafb); font-size: 0.8rem; color: var(--text-primary, #111827); }
.scan-select-all { font-size: 0.8rem; display: flex; align-items: center; gap: 4px; cursor: pointer; }
.scan-create-list-btn { padding: 6px 16px; border: none; border-radius: 8px; background: var(--nav-active, #2D6A4F); color: var(--nav-text-active); font-size: 0.85rem; font-weight: 500; cursor: pointer; }
.scan-create-list-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.scan-create-list-btn:not(:disabled):hover { opacity: 0.9; }
.scan-level-hint { font-size: 0.8rem; color: var(--text-secondary, #6b7280); margin: 0 0 12px 0; }
.scan-word-list { max-height: 400px; overflow-y: auto; border: 1px solid var(--border, #e5e7eb); border-radius: 8px; }
.scan-word-entry { display: flex; align-items: flex-start; gap: 10px; padding: 10px 14px; border-bottom: 1px solid var(--border, #f0f0f0); transition: background 0.1s; }
.scan-word-entry:last-child { border-bottom: none; }
.scan-word-entry:hover { background: var(--bg-hover, #f9fafb); }
.scan-word-check { margin-top: 3px; flex-shrink: 0; }
.scan-word-info { flex: 1; min-width: 0; }
.scan-word-link { font-weight: 600; color: var(--nav-active, #2D6A4F); text-decoration: none; font-size: 0.95rem; }
.scan-word-link:hover { text-decoration: underline; }
.scan-word-def { font-size: 0.82rem; color: var(--text-secondary, #6b7280); margin-top: 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.scan-word-level { flex-shrink: 0; font-size: 0.72rem; font-weight: 600; padding: 2px 8px; border-radius: 10px; }
.scan-word-level.A1 { background: #d1fae5; color: #065f46; }
.scan-word-level.A2 { background: #dbeafe; color: #1e40af; }
.scan-word-level.B1 { background: #fef3c7; color: #92400e; }
.scan-word-level.B2 { background: #fce7f3; color: #9d174d; }
.scan-word-level.C1 { background: #ede9fe; color: #5b21b6; }
.scan-word-level.C2 { background: #fee2e2; color: #991b1b; }
.scan-word-add-btn { flex-shrink: 0; border: 1px solid var(--border, #e5e7eb); background: transparent; color: var(--text-secondary, #6b7280); font-size: 1.1rem; width: 28px; height: 28px; border-radius: 50%; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.15s; }
.scan-word-add-btn:hover { border-color: var(--nav-active, #2D6A4F); color: var(--nav-active, #2D6A4F); }
.scan-word-add-btn.added { background: #d1fae5; border-color: #6ee7b7; color: #065f46; }
#scanVideo { width: 100%; max-height: 400px; border-radius: 8px; margin-top: 12px; }