/* ==========================================================================
   ÔM HOMESTAY ĐÀ NẴNG - DESIGN SYSTEM & BASE STYLES
   UI/UX PRO MAX - 100% VANILLA CSS
   ========================================================================== */

:root {
  /* Colors */
  --color-primary: #173832;         /* Xanh biển sâu rừng nhiệt đới */
  --color-primary-dark: #0e2420;
  --color-primary-light: #eaf3f0;
  --color-accent: #d97706;          /* Nắng vàng Đà Nẵng ấm cúng */
  --color-accent-hover: #b45309;
  --color-accent-soft: #fef3c7;
  --color-terracotta: #c25e3b;      /* Gạch gốm mộc mạc */
  
  --color-bg: #faf7f2;              /* Nền màu kem ấm thư thái */
  --color-surface: #ffffff;
  --color-surface-soft: #f4ede4;
  
  --color-text: #1e293b;            /* Chữ than đen thanh lịch */
  --color-text-muted: #64748b;
  --color-text-light: #94a3b8;
  --color-border: #e6dfd5;
  
  /* Status Colors */
  --status-pending-bg: #fef3c7;
  --status-pending-text: #92400e;
  --status-confirmed-bg: #d1fae5;
  --status-confirmed-text: #065f46;
  --status-completed-bg: #e0e7ff;
  --status-completed-text: #3730a3;
  --status-cancelled-bg: #fee2e2;
  --status-cancelled-text: #991b1b;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-heading: 'Plus Jakarta Sans', var(--font-sans);
  
  /* Radii & Shadows */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 2px 6px rgba(23, 56, 50, 0.04);
  --shadow-md: 0 6px 20px rgba(23, 56, 50, 0.08);
  --shadow-lg: 0 16px 40px rgba(23, 56, 50, 0.12);
  --shadow-card: 0 8px 24px rgba(30, 41, 59, 0.06);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  width: 100%;
  position: relative;
}

main {
  flex: 1;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.container-wide {
  max-width: 1360px;
}

/* Header & Navigation */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary), var(--color-terracotta));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.brand-icon svg {
  width: 24px;
  height: 24px;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-primary);
  line-height: 1.1;
}

.brand-tagline {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  padding: 8px 4px;
  position: relative;
  transition: color var(--transition-fast);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2.5px;
  background-color: var(--color-accent);
  border-radius: var(--radius-full);
  transition: width var(--transition-fast);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: var(--radius-full);
  padding: 10px 22px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  font-size: 0.95rem;
  line-height: 1.4;
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(23, 56, 50, 0.25);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(23, 56, 50, 0.35);
}

.btn-accent {
  background-color: var(--color-accent);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(217, 119, 6, 0.25);
}

.btn-accent:hover {
  background-color: var(--color-accent-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(217, 119, 6, 0.35);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}

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

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

.btn-secondary:hover {
  background-color: #ebdcd0;
}

.btn-danger {
  background-color: #ef4444;
  color: #ffffff;
}

.btn-danger:hover {
  background-color: #dc2626;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
  border-radius: var(--radius-md);
}

.btn-lg {
  padding: 14px 30px;
  font-size: 1.05rem;
}

.btn-block {
  width: 100%;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

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

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

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

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

.badge-featured {
  background-color: var(--color-accent);
  color: #ffffff;
}

/* Alerts */
.alert-container {
  margin-top: 16px;
  margin-bottom: 24px;
}

.alert {
  padding: 14px 18px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  border: 1px solid transparent;
}

.alert svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.alert-success {
  background-color: #ecfdf5;
  border-color: #a7f3d0;
  color: #065f46;
}

.alert-danger {
  background-color: #fef2f2;
  border-color: #fecaca;
  color: #991b1b;
}

.alert-info {
  background-color: #eff6ff;
  border-color: #bfdbfe;
  color: #1e40af;
}

.alert-errors-list {
  margin-left: 20px;
  margin-top: 4px;
}

/* Form Styles */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: #ffffff;
  color: var(--color-text);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  outline: none;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(23, 56, 50, 0.1);
}

.form-error {
  color: #dc2626;
  font-size: 0.82rem;
  margin-top: 6px;
  font-weight: 500;
}

/* User Menu & Dropdown */
.user-menu {
  position: relative;
  display: inline-block;
}

.user-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 6px 14px 6px 8px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.user-badge:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.user-avatar {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}

.user-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
}

/* Footer */
.footer {
  background-color: var(--color-primary-dark);
  color: #d1dedb;
  margin-top: 80px;
  padding-top: 60px;
  padding-bottom: 30px;
  border-top: 4px solid var(--color-accent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand .brand-name {
  color: #ffffff;
}

.footer-desc {
  font-size: 0.92rem;
  line-height: 1.7;
  color: #9cb5af;
  margin-top: 16px;
  margin-bottom: 24px;
}

.footer-title {
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 10px;
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background-color: var(--color-accent);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: #9cb5af;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: #ffffff;
  padding-left: 4px;
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 14px;
  font-size: 0.9rem;
  color: #9cb5af;
}

.footer-contact-item svg {
  width: 18px;
  height: 18px;
  color: var(--color-accent);
  flex-shrink: 0;
  margin-top: 3px;
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: #79948d;
}

/* Mobile Navigation Drawer & Hamburger Toggle */
.nav-toggle-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  cursor: pointer;
  padding: 0;
  transition: all var(--transition-fast);
  color: var(--color-primary);
  flex-shrink: 0;
}

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

.hamburger-bar {
  width: 20px;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.mobile-nav-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(14, 36, 32, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 280ms ease;
}

.mobile-nav-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: 320px;
  max-width: 85vw;
  height: 100vh;
  height: 100dvh;
  background-color: #ffffff;
  z-index: 1001;
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.2);
  transform: translateX(100%);
  transition: transform 300ms cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  padding: 24px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.mobile-nav-drawer.open {
  transform: translateX(0);
}

body.nav-open {
  overflow: hidden;
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 24px;
}

.mobile-nav-close {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.mobile-nav-close:hover {
  background-color: #fee2e2;
  color: #dc2626;
  border-color: #fca5a5;
}

.mobile-nav-close svg {
  width: 20px;
  height: 20px;
}

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 30px;
}

.mobile-nav-link {
  display: block;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.mobile-nav-link.active,
.mobile-nav-link:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  transform: translateX(4px);
}

.mobile-nav-footer {
  margin-top: auto;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mobile-user-card {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.mobile-user-role {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.mobile-auth-btns {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
}

.mobile-logout-form {
  margin-top: 6px;
}

/* ==========================================================
   Comprehensive Responsive Grid System (PC, iPad, Mobile)
   ========================================================== */

/* Tablet & iPad Landscape / Small Desktop (<= 1024px) */
@media (max-width: 1024px) {
  .container {
    padding: 0 24px;
  }
  .navbar-inner {
    height: 75px;
  }
  .nav-menu {
    gap: 18px;
  }
  .nav-link {
    font-size: 0.9rem;
  }
}

/* Tablet & iPad Portrait (<= 992px) */
@media (max-width: 992px) {
  .nav-menu {
    display: none;
  }
  .nav-toggle-btn {
    display: flex;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

/* Mobile & Small Tablets (<= 768px) */
@media (max-width: 768px) {
  .navbar-inner {
    height: 70px;
  }
  .btn-lg {
    padding: 13px 24px;
    font-size: 0.98rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
  .alert-container {
    margin-top: 16px;
    margin-bottom: 16px;
  }
}

/* Standard Mobile (<= 480px) */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  .navbar-inner {
    height: 64px;
  }
  .brand-logo {
    gap: 10px;
  }
  .brand-icon {
    width: 36px;
    height: 36px;
  }
  .brand-icon svg {
    width: 20px;
    height: 20px;
  }
  .brand-name {
    font-size: 1.12rem;
  }
  .brand-tagline {
    display: none; /* Hide subtitle on tiny screens to avoid wrapping */
  }
  .nav-actions {
    display: none; /* Accessible in full via mobile nav drawer */
  }
  .nav-toggle-btn {
    width: 40px;
    height: 40px;
  }
  
  /* Prevent iOS zoom on input focus */
  .form-input, .form-select, .form-textarea {
    font-size: 16px;
    padding: 11px 14px;
  }
  .form-label {
    font-size: 0.85rem;
    margin-bottom: 6px;
  }
  .btn-sm {
    padding: 8px 14px;
    font-size: 0.82rem;
  }
  .btn-block {
    width: 100%;
  }
}

/* Extra Small Mobile (<= 360px - iPhone SE, Galaxy A0) */
@media (max-width: 360px) {
  .brand-name {
    font-size: 1rem;
  }
  .mobile-nav-drawer {
    width: 280px;
    padding: 20px 16px;
  }
}