/* ============================================
   CSS VARIABLES (Design System)
   ============================================ */
:root {
    /* Primary Colors */
    --color-primary: #2271b1;
    --color-primary-dark: #135e96;
    --color-primary-light: #72aee6;
    
    /* Status Colors */
    --color-success: #00a32a;
    --color-warning: #dba617;
    --color-error: #d63638;
    --color-info: #2271b1;
    
    /* Neutral Colors */
    --color-text-dark: #1d2327;
    --color-text-medium: #50575e;
    --color-text-light: #8c8f94;
    --color-bg-white: #ffffff;
    --color-bg-light: #f6f7f7;
    --color-bg-medium: #f0f0f1;
    --color-bg-dark: #2c3338;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-s: 8px;
    --spacing-m: 16px;
    --spacing-l: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    --spacing-xxxl: 64px;
    
    /* Typography */
    --font-size-h1-hero: 48px;
    --font-size-h1: 36px;
    --font-size-h2: 28px;
    --font-size-h3: 22px;
    --font-size-h4: 18px;
    --font-size-body: 16px;
    --font-size-small: 14px;
    --font-size-tiny: 12px;
    
    /* Border Radius */
    --radius-small: 4px;
    --radius-medium: 8px;
    --radius-large: 12px;
    
    /* Shadows */
    --shadow-small: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-medium: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-large: 0 4px 16px rgba(0,0,0,0.15);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: var(--font-size-body);
    line-height: 1.6;
    color: var(--color-text-dark);
    background-color: var(--color-bg-white);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1 {
    font-size: var(--font-size-h1);
    line-height: 1.3;
    font-weight: 700;
    margin-bottom: var(--spacing-l);
}

h1.hero {
    font-size: var(--font-size-h1-hero);
    line-height: 1.2;
}

h2 {
    font-size: var(--font-size-h2);
    line-height: 1.4;
    font-weight: 600;
    margin-bottom: var(--spacing-l);
}

h3 {
    font-size: var(--font-size-h3);
    line-height: 1.4;
    font-weight: 600;
    margin-bottom: var(--spacing-m);
}

h4 {
    font-size: var(--font-size-h4);
    line-height: 1.5;
    font-weight: 600;
    margin-bottom: var(--spacing-m);
}

p {
    margin-bottom: var(--spacing-m);
}

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

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

/* ============================================
   CONTAINER
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-m);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-l);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--spacing-xl);
    }
}

/* ============================================
   HEADER
   ============================================ */
header {
    background-color: var(--color-bg-white);
    border-bottom: 1px solid var(--color-bg-medium);
    padding: var(--spacing-m) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-small);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: var(--font-size-h3);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0;
}

.logo {
    font-size: var(--font-size-h3);
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
}

nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-l);
}

nav a {
    color: var(--color-text-dark);
    font-weight: 500;
    padding: var(--spacing-s) var(--spacing-m);
    border-radius: var(--radius-small);
    transition: background-color var(--transition-fast);
}

nav a:hover {
    background-color: var(--color-bg-light);
    color: var(--color-primary);
}

.user-menu {
    position: relative;
    display: inline-block;
}

.user-menu-toggle {
    background: var(--color-primary);
    color: #fff;
    border: none;
    padding: var(--spacing-s) var(--spacing-m);
    border-radius: var(--radius-small);
    cursor: pointer;
    font-size: var(--font-size-small);
    display: flex;
    align-items: center;
    gap: var(--spacing-s);
    transition: background-color var(--transition-fast);
}

.user-menu-toggle:hover {
    background: var(--color-primary-dark);
}

.dropdown-arrow {
    font-size: 10px;
    transition: transform 0.2s;
}

.user-menu-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: #fff;
    border: 1px solid #c3c4c7;
    border-radius: var(--radius-small);
    box-shadow: var(--shadow-medium);
    min-width: 180px;
    margin-top: 4px;
    z-index: 1000;
}

.user-menu-dropdown.show {
    display: block;
}

.user-menu-dropdown a {
    display: block;
    padding: 10px 16px;
    color: var(--color-text-dark);
    text-decoration: none;
    border-bottom: 1px solid var(--color-bg-medium);
}

.user-menu-dropdown a:last-child {
    border-bottom: none;
}

.user-menu-dropdown a:hover {
    background: var(--color-bg-light);
}

/* Mobile Navigation */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--color-text-dark);
}

@media (max-width: 767px) {
    .mobile-menu-toggle {
        display: block;
    }
    nav {
        display: none;
    }
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--radius-small);
    font-size: var(--font-size-body);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    padding: 10px 22px;
}

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

.btn-tertiary {
    background-color: transparent;
    color: var(--color-primary);
    padding: 8px 16px;
}

.btn-tertiary:hover {
    background-color: var(--color-bg-light);
}

.btn-large {
    padding: 16px 32px;
    font-size: var(--font-size-h4);
}

/* ============================================
   CARDS
   ============================================ */
.card {
    background-color: var(--color-bg-white);
    border: 1px solid var(--color-bg-medium);
    border-radius: var(--radius-medium);
    padding: var(--spacing-l);
    box-shadow: var(--shadow-small);
    transition: box-shadow var(--transition-fast);
}

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

.card-title {
    font-size: var(--font-size-h4);
    font-weight: 600;
    margin-bottom: var(--spacing-m);
    color: var(--color-text-dark);
}

.card-content {
    color: var(--color-text-medium);
}

/* ============================================
   BADGES / TAGS
   ============================================ */
.badge {
    display: inline-block;
    background-color: var(--color-bg-light);
    color: var(--color-text-dark);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: var(--font-size-tiny);
    font-weight: 500;
}

.badge-success {
    background-color: #d5f5d5;
    color: var(--color-success);
}

.badge-warning {
    background-color: #fff8e5;
    color: var(--color-warning);
}

.badge-error {
    background-color: #fcf0f1;
    color: var(--color-error);
}

.badge-info {
    background-color: #e5f5fa;
    color: var(--color-info);
}

/* ============================================
   ALERTS / NOTIFICATIONS
   ============================================ */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-small);
    margin-bottom: var(--spacing-m);
    border-left: 4px solid;
}

.alert-success {
    background-color: #d5f5d5;
    color: var(--color-success);
    border-color: var(--color-success);
}

.alert-warning {
    background-color: #fff8e5;
    color: var(--color-warning);
    border-color: var(--color-warning);
}

.alert-error {
    background-color: #fcf0f1;
    color: var(--color-error);
    border-color: var(--color-error);
}

.alert-info {
    background-color: #e5f5fa;
    color: var(--color-info);
    border-color: var(--color-info);
}

/* ============================================
   FORM ELEMENTS
   ============================================ */
.form-group {
    margin-bottom: var(--spacing-l);
}

label {
    display: block;
    font-size: var(--font-size-small);
    font-weight: 600;
    color: var(--color-text-dark);
    margin-bottom: 6px;
}

.required {
    color: var(--color-error);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="date"],
select,
textarea {
    width: 100%;
    background-color: var(--color-bg-white);
    border: 1px solid var(--color-text-light);
    border-radius: var(--radius-small);
    padding: 10px 14px;
    font-size: var(--font-size-body);
    font-family: inherit;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(34, 113, 177, 0.1);
}

input.error,
select.error,
textarea.error {
    border-color: var(--color-error);
}

.error-message {
    color: var(--color-error);
    font-size: var(--font-size-small);
    margin-top: 4px;
}

/* Checkbox & Radio */
input[type="checkbox"],
input[type="radio"] {
    width: 20px;
    height: 20px;
    margin-right: var(--spacing-s);
    cursor: pointer;
}

input[type="radio"] {
    border-radius: 50%;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero-section {
    position: relative;
    color: #ffffff;
    padding: var(--spacing-xxxl) 0;
    text-align: center;
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
}

.hero-section.hero-with-image {
    background: linear-gradient(135deg, rgba(19, 94, 150, 0.7), rgba(34, 113, 177, 0.7)),
                url('https://images.unsplash.com/photo-1511798616182-aab3698ac53e?auto=format&fit=crop&w=1400&q=80') center/cover no-repeat;
}

.hero-section .hero-subtitle {
    font-size: var(--font-size-h4);
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
}

.hero-section h1 {
    color: #ffffff;
    margin-bottom: var(--spacing-l);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-m);
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================
   GRID LAYOUTS
   ============================================ */
.grid {
    display: grid;
    gap: var(--spacing-l);
}

.grid-2 {
    grid-template-columns: 1fr;
}

.grid-3 {
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .grid-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Image Cards / Category Cards */
.image-card {
    position: relative;
    border-radius: var(--radius-medium);
    overflow: hidden;
    min-height: 240px;
    color: #ffffff;
    display: flex;
    align-items: flex-end;
    box-shadow: var(--shadow-small);
    background: #ccc center/cover no-repeat;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.image-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0,0,0,0) 35%, rgba(0,0,0,0.55) 100%);
}

.image-card .image-card-content {
    position: relative;
    padding: var(--spacing-l);
    z-index: 1;
}

.image-card .image-card-title {
    font-size: var(--font-size-h3);
    font-weight: 700;
    margin-bottom: var(--spacing-s);
}

.image-card .image-card-text {
    font-size: var(--font-size-body);
    opacity: 0.9;
}

.image-card .badge {
    background: rgba(255,255,255,0.15);
    color: #ffffff;
    border: 1px solid rgba(255,255,255,0.3);
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
    padding: var(--spacing-xxl) 0;
}

.section-alt {
    background-color: var(--color-bg-light);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-intro {
    max-width: 760px;
    margin: 0 auto var(--spacing-xl);
    text-align: center;
    color: var(--color-text-medium);
}

.category-hero {
    position: relative;
    border-radius: var(--radius-large);
    overflow: hidden;
    min-height: 320px;
    display: flex;
    align-items: flex-end;
    background: #ccc center/cover no-repeat;
    box-shadow: var(--shadow-medium);
}

.category-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0,0,0,0.15) 0%, rgba(0,0,0,0.65) 100%);
}

.category-hero .category-hero-content {
    position: relative;
    color: #ffffff;
    padding: var(--spacing-xl);
    z-index: 1;
}

/* ============================================
   PROGRESS BAR
   ============================================ */
.progress-bar {
    background-color: var(--color-bg-medium);
    height: 4px;
    border-radius: 2px;
    margin-bottom: var(--spacing-m);
    overflow: hidden;
}

.progress-bar-fill {
    background-color: var(--color-primary);
    height: 100%;
    transition: width var(--transition-normal);
}

.progress-text {
    text-align: right;
    font-size: var(--font-size-small);
    color: var(--color-text-medium);
    margin-bottom: var(--spacing-l);
}

/* ============================================
   STATISTIC CARDS
   ============================================ */
.stat-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-l);
    padding: var(--spacing-l);
}

.stat-icon {
    font-size: 48px;
    color: var(--color-primary);
}

.stat-content {
    flex: 1;
}

.stat-number {
    font-size: var(--font-size-h1);
    font-weight: 700;
    color: var(--color-text-dark);
    line-height: 1;
}

.stat-label {
    font-size: var(--font-size-small);
    color: var(--color-text-medium);
    margin-top: var(--spacing-s);
}

/* ============================================
   EVENT CARD
   ============================================ */
.event-card {
    position: relative;
}

.event-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--spacing-m);
}

.event-date {
    font-weight: 600;
    color: var(--color-primary);
}

.event-location {
    color: var(--color-text-medium);
    font-size: var(--font-size-small);
}

.event-meta {
    display: flex;
    gap: var(--spacing-m);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-m);
}

.event-actions {
    margin-top: var(--spacing-l);
    display: flex;
    justify-content: flex-end;
}

/* ============================================
   FOOTER
   ============================================ */
footer {
    background-color: var(--color-bg-dark);
    color: #ffffff;
    padding: var(--spacing-xxl) 0 var(--spacing-l);
}

footer a {
    color: #ffffff;
    opacity: 0.8;
}

footer a:hover {
    opacity: 1;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

@media (min-width: 768px) {
    .footer-content {
        grid-template-columns: repeat(3, 1fr);
    }
}

.footer-column h4 {
    color: #ffffff;
    margin-bottom: var(--spacing-m);
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: var(--spacing-s);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-l);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-center {
    text-align: center;
}

.text-muted {
    color: var(--color-text-medium);
}

.mb-0 {
    margin-bottom: 0;
}

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

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