/* ==========================================================================
   COMMON STYLES - THCS NGŨ PHÚC
   Các biến màu, spacing, font, animation chung cho toàn bộ website
   ========================================================================== */

/* CSS Variables */
:root {
  /* Colors */
  --color-primary: #0055cc;
  --color-primary-dark: #003d99;
  --color-primary-light: #3377dd;
  --color-secondary: #dc3545;
  --color-white: #ffffff;
  --color-gray-light: #f2f2f2;
  --color-gray: #e0e0e0;
  --color-gray-dark: #999999;
  --color-text: #222222;
  --color-text-light: #666666;
  --color-success: #28a745;
  --color-warning: #ffc107;
  --color-danger: #dc3545;

  /* Gradient */
  --gradient-primary: linear-gradient(135deg, #0055cc 0%, #3377dd 100%);
  --gradient-hero: linear-gradient(135deg, #ffffff 0%, #e3f2fd 100%);

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 0.75rem;
  --spacing-lg: 1rem;
  --spacing-xl: 1.5rem;
  --spacing-xxl: 2rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;

  /* Shadow */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.25);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;

  /* Font */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Helvetica Neue', sans-serif;
  --font-size-xs: 0.7rem;
  --font-size-sm: 0.8rem;
  --font-size-base: 0.9rem;
  --font-size-lg: 1rem;
  --font-size-xl: 1.1rem;
  --font-size-2xl: 1.3rem;
  --font-size-3xl: 1.5rem;
  --font-size-4xl: 1.8rem;

  /* Layout */
  --max-width: 1200px;
  --header-height: 100px;
  --nav-height: 45px;
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */

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

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

body {
  font-family: var(--font-primary);
  color: var(--color-text);
  background-color: var(--color-white);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

a:hover {
  color: var(--color-primary);
}

button {
  font-family: inherit;
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
}

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

/* ==========================================================================
   UTILITY CLASSES
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--spacing-md);
}

/* Text Utilities */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.text-primary {
  color: var(--color-primary);
}

.text-secondary {
  color: var(--color-secondary);
}

.text-white {
  color: var(--color-white);
}

.text-bold {
  font-weight: 700;
}

/* Spacing Utilities */
.mt-1 {
  margin-top: var(--spacing-xs);
}

.mt-2 {
  margin-top: var(--spacing-sm);
}

.mt-3 {
  margin-top: var(--spacing-md);
}

.mt-4 {
  margin-top: var(--spacing-lg);
}

.mt-5 {
  margin-top: var(--spacing-xl);
}

.mb-1 {
  margin-bottom: var(--spacing-xs);
}

.mb-2 {
  margin-bottom: var(--spacing-sm);
}

.mb-3 {
  margin-bottom: var(--spacing-md);
}

.mb-4 {
  margin-bottom: var(--spacing-lg);
}

.mb-5 {
  margin-bottom: var(--spacing-xl);
}

.pt-1 {
  padding-top: var(--spacing-xs);
}

.pt-2 {
  padding-top: var(--spacing-sm);
}

.pt-3 {
  padding-top: var(--spacing-md);
}

.pt-4 {
  padding-top: var(--spacing-lg);
}

.pt-5 {
  padding-top: var(--spacing-xl);
}

.pb-1 {
  padding-bottom: var(--spacing-xs);
}

.pb-2 {
  padding-bottom: var(--spacing-sm);
}

.pb-3 {
  padding-bottom: var(--spacing-md);
}

.pb-4 {
  padding-bottom: var(--spacing-lg);
}

.pb-5 {
  padding-bottom: var(--spacing-xl);
}

/* ==========================================================================
   BUTTON STYLES
   ========================================================================== */

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-align: center;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--color-white);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: var(--color-white);
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-lg {
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
}

.btn-sm {
  padding: 0.2rem 0.4rem;
  font-size: var(--font-size-xs);
}

/* ==========================================================================
   CARD STYLES
   ========================================================================== */

.card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.card-text {
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ==========================================================================
   HEADER STYLES
   ========================================================================== */

.header {
  background: var(--gradient-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-top {
  padding: var(--spacing-lg) 0;
  background-image: url('../images/banner.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  border-bottom: 2px solid var(--color-primary);
  position: relative;
}

.header-top::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.342) 0%, rgba(255, 255, 255, 0.527) 100%);
  z-index: 0;
}

.header-top .container {
  position: relative;
  z-index: 1;
}

.header-top-content {
  display: flex;
  align-items: center;
  justify-content: start;
  gap: var(--spacing-xl);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-shrink: 0;
}

.logo-container {
  width: 50px;
  height: 50px;
  background-color: var(--color-white);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: var(--spacing-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.logo-container img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.school-name {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
}

.header-title {
  text-align: center;
}

.header-title h1 {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
  line-height: 1.2;
  text-shadow: 1px 2px rgb(255, 255, 255);
}

.header-title h2 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-secondary);
  line-height: 1.2;
  text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
}

/* Navigation */
.navbar {
  background-color: var(--color-primary);
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--nav-height);
  padding: var(--spacing-xs) 0;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-sm);
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
  align-items: center;
}

.nav-menu li a {
  color: var(--color-white);
  font-weight: 600;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  display: block;
  font-size: var(--font-size-sm);
  white-space: nowrap;
}

.nav-menu li a:hover,
.nav-menu li a.active {
  background-color: rgba(255, 255, 255, 0.2);
  color: var(--color-white);
}

/* Admin links styling */
.nav-menu li a[href*="admin/"] {
  background-color: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.nav-menu li a[href*="admin/"]:hover {
  background-color: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.5);
}

/* School Home Link with Tooltip */
.nav-link-school-home {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
}

.nav-link-school-home i {
  font-size: var(--font-size-lg);
}

.nav-link-school-home .mobile-tooltip-text {
  display: none;
}

.nav-link-school-home::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background-color: rgba(0, 0, 0, 0.9);
  color: var(--color-white);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: all var(--transition-fast);
  margin-bottom: var(--spacing-xs);
  z-index: 1001;
  font-weight: 500;
  box-shadow: var(--shadow-md);
}

.nav-link-school-home::before {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(2px);
  border: 5px solid transparent;
  border-top-color: rgba(0, 0, 0, 0.9);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: all var(--transition-fast);
  z-index: 1001;
}

.nav-link-school-home:hover::after,
.nav-link-school-home:hover::before {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-toggle {
  display: none;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-sm);
  color: var(--color-white);
  font-size: var(--font-size-2xl);
  cursor: pointer;
  padding: var(--spacing-xs) var(--spacing-sm);
  transition: all var(--transition-fast);
  line-height: 1;
  min-width: 40px;
  min-height: 40px;
  align-items: center;
  justify-content: center;
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.2);
}

.nav-toggle:active {
  background: rgba(255, 255, 255, 0.3);
}

/* ==========================================================================
   FOOTER STYLES
   ========================================================================== */

.footer {
  background: var(--gradient-primary);
  color: var(--color-white);
  padding: var(--spacing-xl) 0 var(--spacing-md);
  margin-top: var(--spacing-xxl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
  font-weight: 700;
}

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

.footer-nav li {
  margin-bottom: var(--spacing-sm);
}

.footer-nav li a {
  color: var(--color-white);
  transition: all var(--transition-fast);
  display: inline-block;
}

.footer-nav li a:hover {
  transform: translateX(5px);
  color: var(--color-white);
  opacity: 0.8;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  font-size: var(--font-size-sm);
}

i.fas {
  color: var(--color-white);
}

/* ==========================================================================
   ANIMATIONS
   ========================================================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.fade-in {
  animation: fadeIn var(--transition-slow) ease-in-out;
}

.fade-in-up {
  animation: fadeInUp var(--transition-slow) ease-in-out;
}

.slide-in-left {
  animation: slideInLeft var(--transition-slow) ease-in-out;
}

.slide-in-right {
  animation: slideInRight var(--transition-slow) ease-in-out;
}

/* Scroll animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all var(--transition-slow);
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */

/* Desktop - adjust for more links */
@media (min-width: 1025px) and (max-width: 1280px) {
  .nav-menu {
    gap: var(--spacing-xs);
  }

  .nav-menu li a {
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs);
  }
}

/* Tablet */
@media (max-width: 1024px) {
  :root {
    --font-size-3xl: 1.75rem;
    --font-size-4xl: 2rem;
  }

  .header-title h1 {
    font-size: var(--font-size-sm);
  }

  .header-title h2 {
    font-size: var(--font-size-lg);
  }

  /* Show mobile menu earlier when admin logged in */
  .nav-toggle {
    display: flex !important;
  }

  .nav-menu {
    position: fixed;
    left: -100%;
    top: calc(var(--header-height) + var(--nav-height));
    flex-direction: column;
    background-color: var(--color-primary);
    width: 100%;
    text-align: center;
    transition: left 0.3s ease-in-out;
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm) 0;
    gap: 0;
    z-index: 999;
    max-height: calc(100vh - var(--header-height) - var(--nav-height));
    overflow-y: auto;
  }

  .nav-menu.active {
    left: 0 !important;
  }
}

/* Mobile */
@media (max-width: 768px) {
  .nav-menu li {
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-menu li:last-child {
    border-bottom: none;
  }

  .nav-menu li a {
    width: 100%;
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
  }

  /* Hide tooltip on mobile, show text instead */
  .nav-link-school-home::after,
  .nav-link-school-home::before {
    display: none;
  }

  .nav-link-school-home {
    min-width: auto;
    flex-direction: row;
    justify-content: center;
  }

  .nav-link-school-home .mobile-tooltip-text {
    display: inline;
    margin-left: var(--spacing-xs);
    font-size: var(--font-size-base);
    font-weight: 600;
  }

  .nav-content {
    position: relative;
  }

  .header-top-content {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .header-title h1 {
    font-size: var(--font-size-xs);
  }

  .header-title h2 {
    font-size: var(--font-size-sm);
  }

  .logo-container {
    width: 35px;
    height: 35px;
  }

  .school-name {
    font-size: var(--font-size-xs);
  }
}

@media (max-width: 640px) {
  :root {
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

  .header-top {
    padding: var(--spacing-sm) 0;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
}

/* ==========================================================================
   FONT AWESOME ICON STYLES
   ========================================================================== */

/* Button Icons */
.btn i,
.btn .btn-icon i {
  transition: all var(--transition-normal);
}

.btn-primary i {
  color: var(--color-white);
}

.btn-secondary i {
  color: var(--color-primary);
}

.btn-secondary:hover i {
  color: var(--color-white);
}

.btn-secondary:active i {
  color: var(--color-primary);
}

.btn-danger i {
  color: var(--color-white);
}

.btn:hover i {
  transform: scale(1.1);
}

/* Header & Title Icons */
.page-title i,
.hero-title i,
.section-title i {
  color: var(--color-primary);
  margin-right: var(--spacing-xs);
}

.page-header .page-title i {
  color: var(--color-white);
  opacity: 0.95;
}

/* Navigation Icons */
.nav-toggle i {
  color: var(--color-white);
  font-size: var(--font-size-lg);
}

.admin-nav-link i {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  transition: all var(--transition-normal);
}

.admin-nav-link:hover i {
  color: var(--color-primary);
  transform: scale(1.15);
}

.admin-nav-link.active i {
  color: var(--color-white);
}

/* Feature & Info Card Icons */
.feature-icon i,
.info-card-icon i,
.hero-icon i {
  font-size: 3rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.feature-item-icon i {
  font-size: 2rem;
  color: var(--color-primary);
}

/* Timeline Icons */
.timeline-icon i {
  font-size: 1.8rem;
  color: var(--color-primary);
}

/* Stat Card Icons */
.stat-icon i {
  font-size: 2rem;
  color: var(--color-primary);
}

.stat-card.stat-new .stat-icon i {
  color: var(--color-warning);
}

.stat-card.stat-processing .stat-icon i {
  color: #ff9800;
}

.stat-card.stat-done .stat-icon i {
  color: var(--color-success);
}

/* Empty State Icons */
.empty-icon i {
  font-size: 4rem;
  color: var(--color-gray-dark);
  opacity: 0.5;
}

/* Modal Icons */
.modal-icon i {
  font-size: 3rem;
}

.modal-icon.success i {
  color: var(--color-success);
}

.modal-title i {
  color: var(--color-primary);
  margin-right: var(--spacing-xs);
}

/* Warning/Alert Icons */
.warning-icon i,
.modal-warning i {
  color: var(--color-warning);
  margin-right: var(--spacing-xs);
}

.chat-disclaimer i {
  color: var(--color-warning);
}

/* Form Label Icons */
.label-icon i,
.form-label i {
  color: var(--color-primary);
  margin-right: var(--spacing-xs);
}

/* Type Selector Icons */
.type-icon i {
  font-size: 1.5rem;
  color: var(--color-primary);
  transition: all var(--transition-normal);
}

.type-option:hover .type-icon i {
  transform: scale(1.2);
  color: var(--color-primary-light);
}

.type-option input:checked~.type-card .type-icon i {
  color: var(--color-white);
}

/* Pagination Icons */
.pagination-btn i {
  color: var(--color-primary);
  transition: all var(--transition-normal);
}

.pagination-btn:hover:not(:disabled) i {
  transform: scale(1.2);
}

.pagination-btn:disabled i {
  color: var(--color-gray-dark);
}

/* Search Input Icons */
.search-box i {
  color: var(--color-gray-dark);
}

/* Login Page Icons */
.login-icon i {
  font-size: 3.5rem;
  color: var(--color-primary);
}

.toggle-password i {
  color: var(--color-text-light);
  transition: color var(--transition-normal);
}

.toggle-password:hover i {
  color: var(--color-primary);
}

.footer-icon i {
  color: var(--color-primary);
  margin-right: var(--spacing-xs);
}

.info-panel-icon i {
  font-size: 3rem;
  color: var(--color-primary);
}

.list-icon i {
  color: var(--color-primary);
  font-size: var(--font-size-lg);
  width: 24px;
  text-align: center;
}

.notice-icon i {
  font-size: 1.5rem;
  color: var(--color-success);
}

.security-notice .notice-icon i {
  color: var(--color-success);
}

/* Chat Icons */
.chat-avatar i {
  font-size: 1.8rem;
  color: var(--color-primary);
}

.btn-back i,
.btn-clear i {
  color: var(--color-text);
}

.btn-send i {
  color: var(--color-white);
}

/* Feedback CTA Icon */
.feedback-cta-icon i {
  font-size: 3.5rem;
  color: var(--color-primary);
}

/* Logo Fallback Icon */
.logo-container i.fa-school {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

/* Filter Icons */
.filter-label i {
  color: var(--color-primary);
  margin-right: var(--spacing-xs);
}

/* Section Title Icons */
.title-icon i {
  color: var(--color-primary);
}

.section-header .title-icon i {
  color: var(--color-primary);
}

.card-title .title-icon i {
  color: var(--color-primary);
}

/* Hover effects for interactive icons */
a:hover i,
button:not(:disabled):hover i {
  transition: transform var(--transition-fast);
}

/* Responsive Icon Sizes */
@media (max-width: 768px) {

  .feature-icon i,
  .info-card-icon i,
  .hero-icon i {
    font-size: 2.5rem;
  }

  .empty-icon i {
    font-size: 3rem;
  }

  .modal-icon i {
    font-size: 2.5rem;
  }

  .login-icon i,
  .info-panel-icon i,
  .feedback-cta-icon i {
    font-size: 2.5rem;
  }
}