/* ============================================================
   CSS/BASE.CSS — Design Tokens (White Theme), Reset, Header
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* White-theme surface colors */
  --color-bg:           #f1f5f9;
  --color-surface:      #ffffff;
  --color-surface-2:    #f8fafc;
  --color-border:       #e2e8f0;
  --color-border-hover: #cbd5e1;

  /* Brand accent */
  --color-primary:      #2563eb;
  --color-primary-light:#eff6ff;
  --color-primary-glow: rgba(37,99,235,0.15);
  --color-primary-dark: #1d4ed8;

  /* Semantic colors */
  --color-green:        #16a34a;
  --color-green-light:  #f0fdf4;
  --color-yellow:       #d97706;
  --color-yellow-light: #fffbeb;
  --color-purple:       #7c3aed;
  --color-purple-light: #f5f3ff;
  --color-red:          #dc2626;
  --color-red-light:    #fef2f2;
  --color-teal:         #0891b2;
  --color-teal-light:   #ecfeff;

  /* Text */
  --color-text:         #0f172a;
  --color-text-muted:   #64748b;
  --color-text-dim:     #94a3b8;

  /* Typography */
  --font-body: 'Inter', 'Noto Sans TC', sans-serif;

  /* Font sizes */
  --size-xs:  0.75rem;
  --size-sm:  0.875rem;
  --size-md:  1rem;
  --size-lg:  1.125rem;
  --size-xl:  1.25rem;
  --size-2xl: 1.5rem;
  --size-3xl: 1.875rem;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Radii */
  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   16px;
  --radius-xl:   24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.06);

  /* Transitions */
  --transition-fast:   0.12s ease;
  --transition-normal: 0.2s ease;
  --transition-slow:   0.35s ease;

  /* Layout */
  --header-height:  64px;
  --sidebar-width:  260px;
  --max-width:      1440px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* 預防未登入內容閃現 */
body[data-auth-required] {
  display: none !important;
}

h1,h2,h3,h4,h5,h6 { line-height: 1.25; font-weight: 600; }
a  { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, select, textarea { font-family: inherit; }

/* ---------- App Header ---------- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between; /* Ensure left and right are spread */
  position: relative;
  z-index: 10;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex-shrink: 0;
  padding-right: var(--space-8);
}

.burger-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.burger-icon, .burger-icon::before, .burger-icon::after {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  position: relative;
  transition: all var(--transition-normal);
}

.burger-icon::before, .burger-icon::after { content: ""; position: absolute; left: 0; }
.burger-icon::before { top: -6px; }
.burger-icon::after  { top: 6px; }

.burger-btn.active .burger-icon { background: transparent; }
.burger-btn.active .burger-icon::before { transform: rotate(45deg); top: 0; }
.burger-btn.active .burger-icon::after  { transform: rotate(-45deg); top: 0; }

.header-icon { font-size: 1.5rem; line-height: 1; }

.header-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  line-height: 1.1;
  border-left: 2px solid var(--color-border);
  padding-left: var(--space-4);
}

.header-title { font-size: 16px; font-weight: 700; color: var(--color-text); white-space: nowrap; letter-spacing: 0.02em; }
.header-page { font-size: 12px; font-weight: 500; color: var(--color-text-dim); white-space: nowrap; }

/* ---------- Header Nav ---------- */
.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex: 1;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: all var(--transition-normal);
  border: 1px solid transparent;
}

.nav-link:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
  border-color: var(--color-border);
}

.nav-link.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-color: rgba(37,99,235,0.25);
}

/* ---------- Header Right (User Menu) ---------- */
.header-right { 
  position: relative;
  z-index: 11; /* Above other header elements */
}

.user-menu { position: relative; }

.user-avatar-btn {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: var(--color-surface-2);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
  font-size: var(--size-sm);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  user-select: none;
  transition: all var(--transition-normal);
}

.user-avatar-btn:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
}

.user-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 220px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition: all var(--transition-normal);
  z-index: 200;
}

.user-dropdown.open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.user-dropdown-email {
  padding: var(--space-2) var(--space-3);
  font-size: var(--size-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}

.user-dropdown-divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-1) 0;
}

.user-dropdown-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: var(--space-2) var(--space-3);
  font-size: var(--size-sm);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.user-dropdown-item:hover { background: var(--color-surface-2); }

/* ---------- Layout Container ---------- */
.app-layout {
  display: flex;
  min-height: calc(100vh - var(--header-height));
  position: relative;
  overflow: clip; /* Fix potential layout shifts */
}

/* ---------- Sidebar ---------- */
.app-sidebar {
  width: var(--sidebar-width);
  background: var(--color-surface-2);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
  z-index: 100;
  transition: transform var(--transition-normal);
}

.sidebar-header { padding: var(--space-8) var(--space-5) var(--space-2); }
.sidebar-title { 
  font-size: 11px; 
  font-weight: 800; 
  color: var(--color-text-dim); 
  text-transform: uppercase; 
  letter-spacing: 0.15em; 
  padding-left: var(--space-4);
}

.sidebar-nav { 
  padding: var(--space-4) var(--space-3); 
  display: flex; 
  flex-direction: column; 
  gap: var(--space-1); 
  flex: 1; 
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3.5) var(--space-4);
  border-radius: var(--radius-lg);
  color: var(--color-text-muted);
  font-size: var(--size-sm);
  font-weight: 500;
  transition: all var(--transition-normal);
  width: 100%;
  text-align: left;
  position: relative;
  overflow: hidden;
}

/* Active indicator - the 'column/block' indicator */
.sidebar-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20%;
  height: 60%;
  width: 4px;
  background: var(--color-primary);
  border-radius: 0 4px 4px 0;
  opacity: 0;
  transition: all var(--transition-normal);
  transform: translateX(-4px);
}

.sidebar-item .item-icon { 
  font-size: 1.3rem; 
  width: 24px; 
  display: flex; 
  align-items: center; 
  justify-content: center;
  transition: transform var(--transition-normal);
}

.sidebar-item:hover { 
  background: var(--color-surface); 
  color: var(--color-text); 
  transform: translateX(4px);
}

.sidebar-item:hover .item-icon { transform: scale(1.1); }

.sidebar-item.active { 
  background: var(--color-surface); 
  color: var(--color-primary); 
  font-weight: 600; 
  box-shadow: var(--shadow-sm);
}

.sidebar-item.active::before {
  opacity: 1;
  transform: translateX(0);
}

.sidebar-footer { 
  padding: var(--space-6) var(--space-5); 
  font-size: 0.7rem; 
  color: var(--color-text-dim); 
  border-top: 1px solid var(--color-border); 
  text-align: center;
}

.sidebar-overlay {
  display: none !important; /* 完全移除遮罩層，實現「直接呈現在內頁」的感覺 */
}

/* ---------- Main Layout ---------- */
.main-content {
  flex: 1;
  max-width: var(--max-width);
  padding: var(--space-5) var(--space-12) var(--space-16);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  min-width: 0;
}

/* ---------- Page Header ---------- */
.page-header {
  padding-bottom: var(--space-2);
  margin-bottom: 0;
  position: relative;
}

.page-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.page-title {
  font-size: var(--size-3xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.page-desc {
  font-size: var(--size-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.page-actions { display: flex; gap: var(--space-3); }

/* ---------- Section Title ---------- */
.section-title {
  font-size: var(--size-md);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--size-sm);
  font-weight: 600;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  box-shadow: 0 1px 4px rgba(37,99,235,0.25);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-secondary:hover {
  background: var(--color-surface-2);
  border-color: var(--color-border-hover);
}

.btn-danger {
  background: var(--color-red-light);
  color: var(--color-red);
  border-color: rgba(220,38,38,0.3);
}
.btn-danger:hover {
  background: var(--color-red);
  color: #fff;
  border-color: var(--color-red);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(220,38,38,0.25);
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb {
  background: var(--color-border-hover);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--color-text-dim); }

@media (max-width: 1024px) {
  .app-layout { overflow-x: hidden; }
  .app-sidebar {
    position: fixed;
    left: 0;
    top: var(--header-height);
    transform: translateX(-100%);
    z-index: 110;
    background: var(--color-surface);
    box-shadow: 10px 0 30px rgba(0,0,0,0.1); /* 用陰影代替遮罩，更有內頁呈現感 */
  }
  .app-sidebar.open { transform: translateX(0); }
  .burger-btn { display: flex; z-index: 120; }
  .main-content { padding: var(--space-4) var(--space-4) var(--space-12); transition: transform var(--transition-normal); }
  
  /* 當側欄開啟時，主內容微微向右偏移，營造推動感 */
  .app-sidebar.open + .main-content { transform: translateX(20px); }
  
  /* Prevent iOS background zoom by ensuring 16px font-size for inputs */
  input, select, textarea, .form-input, .search-input {
    font-size: 16px !important;
  }
  
  /* Reposition Add button on mobile to Top Right of content area */
  .page-header { position: relative; min-height: 50px; }
  .page-actions {
    position: absolute;
    top: 0;
    right: 0;
    z-index: 10;
  }
  .btn-primary { 
    padding: var(--space-2) var(--space-3); 
    font-size: var(--size-xs);
    border-radius: var(--radius-full); /* Circular like a mini FAB */
  }
}

@media (max-width: 768px) {
  .main-content { padding: var(--space-4) var(--space-3) var(--space-10); gap: var(--space-4); }
  .page-title   { font-size: var(--size-xl); }
  .page-header-inner { flex-direction: column; align-items: flex-start; gap: var(--space-2); }
  .header-icon { font-size: 1.25rem; }
  .header-title { display: none; }
  .header-divider { display: none; }
  .header-nav { display: none; }
}

@media (max-width: 380px) {
  .main-content { padding: var(--space-3) var(--space-2) var(--space-8); }
  .page-title { font-size: var(--size-lg); }
  .btn { padding: var(--space-2) var(--space-3); font-size: 0.7rem; }
}
@media (max-width: 480px) {
  .page-actions { flex-wrap: wrap; }
  .btn { padding: var(--space-2) var(--space-4); font-size: var(--size-xs); }
}