/* ============================================================
   FREIGHT RATE PORTAL — Premium Design System
   Theme: Deep Burgundy (#8B0000), Clean White, Professional
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* --- CSS Custom Properties --- */
:root {
  --color-primary:       #8B0000;
  --color-primary-dark:  #6B0000;
  --color-primary-light: #A52A2A;
  --color-primary-hover: #A00000;

  --color-bg:            #f0f2f5;
  --color-surface:       #ffffff;
  --color-surface-2:     #fafbfc;
  --color-surface-3:     #f5f6f8;

  --color-border:        #e1e4e8;
  --color-border-light:  #f0f1f3;

  --color-text-primary:  #1a1a2e;
  --color-text-secondary:#4a4a5a;
  --color-text-muted:    #8a8a9a;
  --color-text-inverse:  #ffffff;

  --color-success:       #1a7f37;
  --color-warning:       #cf4b00;
  --color-error:         #cf222e;
  --color-info:          #0969da;

  --color-expired-bg:    #fff5f5;
  --color-expired-text:  #b71c1c;

  --font-primary:        'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
  --font-size-xs:        11px;
  --font-size-sm:        13px;
  --font-size-base:      14px;
  --font-size-md:        16px;
  --font-size-lg:        20px;
  --font-size-xl:        24px;
  --font-size-2xl:       32px;

  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  20px;
  --space-6:  24px;
  --space-8:  32px;
  --space-10: 40px;
  --space-12: 48px;

  --radius:    6px;
  --radius-sm: 4px;
  --radius-lg: 8px;

  --shadow-sm:  0 1px 2px rgba(0,0,0,.04), 0 1px 3px rgba(0,0,0,.08);
  --shadow-md:  0 2px 4px rgba(0,0,0,.04), 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg:  0 4px 8px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.10);
  --shadow-xl:  0 8px 16px rgba(0,0,0,.06), 0 16px 48px rgba(0,0,0,.12);

  --max-width: 1200px;
  --header-h:  64px;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

/* --- Global Header --- */
.site-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-text-inverse);
  height: var(--header-h);
  display: flex;
  align-items: center;
  padding: 0 var(--space-6);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.site-header .logo {
  font-size: var(--font-size-lg);
  font-weight: 700;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.site-header .logo .logo-icon {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.15);
  border: 2px solid rgba(255,255,255,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  border-radius: var(--radius);
}

.site-header .header-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 10px 20px;
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all .2s ease;
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
  line-height: 1.4;
}

.btn:disabled {
  opacity: .5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: 0 1px 3px rgba(139,0,0,0.3);
}
.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(139,0,0,0.35);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}
.btn-outline:hover:not(:disabled) {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border: 1.5px solid var(--color-border);
}
.btn-ghost:hover:not(:disabled) {
  background: var(--color-surface-3);
  color: var(--color-text-primary);
  border-color: var(--color-border-dark);
}

.btn-danger {
  background: var(--color-error);
  color: var(--color-text-inverse);
}
.btn-danger:hover:not(:disabled) {
  background: #b01e2c;
}

.btn-sm {
  padding: 6px 14px;
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: 14px 28px;
  font-size: var(--font-size-md);
}

.btn-block {
  width: 100%;
}

/* --- Form Elements --- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  outline: none;
  transition: all .2s ease;
  -webkit-appearance: none;
  appearance: none;
}

.form-control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(139,0,0,0.08);
}

.form-control::placeholder {
  color: var(--color-text-muted);
}

select.form-control {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='%238a8a9a' d='M5 6L0 0h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

/* --- Cards --- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow .2s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface-2);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-body {
  padding: var(--space-5);
}

/* --- Badge / Tag --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: 100px;
  line-height: 1.4;
}

.badge-air {
  background: #e8f4fd;
  color: #0969da;
}

.badge-ocean {
  background: #ddf4e4;
  color: #1a7f37;
}

.badge-expired {
  background: var(--color-expired-bg);
  color: var(--color-expired-text);
}

.badge-active {
  background: #ddf4e4;
  color: #1a7f37;
}

/* --- Divider --- */
.divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-5) 0;
}

/* --- Alert --- */
.alert {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-4);
  border: 1px solid;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.alert-error   { background: #fff5f5; border-color: #ffd5d5; color: var(--color-error); }
.alert-success { background: #f0fff4; border-color: #c6f6d5; color: var(--color-success); }
.alert-warning { background: #fffaf0; border-color: #feebc8; color: var(--color-warning); }
.alert-info    { background: #f0f9ff; border-color: #bae6fd; color: var(--color-info); }

/* --- Loading Spinner --- */
.spinner {
  display: inline-block;
  width: 28px;
  height: 28px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}

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

.loading-overlay {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: var(--space-12) var(--space-6);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* --- Empty State --- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-12) var(--space-6);
  color: var(--color-text-muted);
  text-align: center;
}

.empty-state .empty-icon {
  font-size: 48px;
  opacity: .4;
  margin-bottom: var(--space-2);
}

.empty-state p {
  font-size: var(--font-size-sm);
  max-width: 280px;
  line-height: 1.6;
}

/* --- Tab Navigation --- */
.tab-nav {
  display: flex;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0 var(--space-6);
  gap: var(--space-1);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tab-btn {
  flex: 0 0 auto;
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  cursor: pointer;
  transition: all .2s ease;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.tab-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-btn:hover:not(.active) {
  color: var(--color-text-primary);
}

/* --- Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 200;
  padding: 0;
}

@media (min-width: 600px) {
  .modal-overlay {
    align-items: center;
    padding: var(--space-6);
  }
}

.modal {
  background: var(--color-surface);
  width: 100%;
  max-width: 580px;
  max-height: 90vh;
  overflow-y: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  animation: slideUp .25s ease;
}

@keyframes slideUp {
  from { transform: translateY(40px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.modal-header {
  padding: var(--space-5) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.modal-title {
  font-size: var(--font-size-md);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.modal-close {
  background: none;
  border: none;
  color: rgba(255,255,255,.8);
  font-size: 22px;
  cursor: pointer;
  padding: 4px;
  line-height: 1;
  border-radius: var(--radius);
  transition: all .15s;
}

.modal-close:hover { color: white; background: rgba(255,255,255,0.15); }

.modal-body {
  padding: var(--space-5);
}

.modal-footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: var(--space-2);
  justify-content: flex-end;
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* --- Utility --- */
.text-muted    { color: var(--color-text-muted); }
.text-sm       { font-size: var(--font-size-sm); }
.text-xs       { font-size: var(--font-size-xs); }
.text-bold     { font-weight: 700; }
.text-upper    { text-transform: uppercase; letter-spacing: 0.02em; }
.text-center   { text-align: center; }
.d-flex        { display: flex; }
.align-center  { align-items: center; }
.gap-2         { gap: var(--space-2); }
.gap-3         { gap: var(--space-3); }
.mt-4          { margin-top: var(--space-4); }
.mb-4          { margin-bottom: var(--space-4); }
.hidden        { display: none !important; }

/* --- Responsive Grid --- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

@media (max-width: 480px) {
  .grid-2 { grid-template-columns: 1fr; }
}

/* --- Footer --- */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,.55);
  text-align: center;
  padding: var(--space-5) var(--space-6);
  font-size: var(--font-size-xs);
  letter-spacing: 0.02em;
  margin-top: auto;
}

/* --- Scrollbar Styling --- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb { background: #c1c4c8; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #a1a4a8; }