/* ==========================================================================
   SMS App - Blue/Cyan Theme
   Modernized with rounded corners (8px) and soft shadows
   ========================================================================== */

/* Variables - Blue/Cyan Palette */
:root {
    /* Primary Blues */
    --primary-color: #0ea5e9;
    --primary-dark: #0284c7;
    --primary-light: #38bdf8;
    
    /* Secondary Cyan */
    --secondary-color: #06b6d4;
    --secondary-dark: #0891b2;
    --secondary-light: #22d3ee;
    
    /* Status Colors (kept for compatibility) */
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --success-color: #27ae60;
    --info-color: #9b59b6;
    
    /* Neutral Colors */
    --light-color: #f0f9ff;
    --dark-color: #0f172a;
    --gray-color: #64748b;
    --border-color: #e2e8f0;
    
    /* Design Tokens - Modernized */
    --border-radius: 8px;
    --border-radius-sm: 6px;
    --border-radius-lg: 12px;
    --box-shadow: 0 4px 15px rgba(14, 165, 233, 0.1);
    --box-shadow-lg: 0 8px 25px rgba(14, 165, 233, 0.15);
    --transition: all 0.3s ease;
    
    /* Backgrounds */
    --bg-primary: #f5f7fa;
    --bg-white: #ffffff;
    --bg-gradient: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
}

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

body {
    line-height: 1.6;
    color: #333;
    background-color: var(--bg-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

header {
    background: var(--bg-gradient);
    color: white;
    padding: 15px 0;
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo a {
    color: white;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo a i {
    font-size: 1.3rem;
}

/* Navbar Admin Badge */
.navbar-admin-badge {
    background: rgba(255, 255, 255, 0.25);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: 10px;
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

nav {
    display: flex;
    align-items: center;
    gap: 5px;
}

nav a {
    color: white;
    text-decoration: none;
    margin-left: 15px;
    transition: var(--transition);
    padding: 8px 15px;
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 0.95rem;
}

nav a:hover {
    background-color: rgba(255, 255, 255, 0.15);
}

nav a.active {
    background-color: rgba(255, 255, 255, 0.25);
    font-weight: 600;
}

.credits-badge {
    background-color: rgba(255, 255, 255, 0.2);
    padding: 6px 14px;
    border-radius: 20px;
    font-weight: bold;
    font-size: 0.9rem;
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.25);
}

/* ==========================================================================
   Main Content
   ========================================================================== */

main {
    padding: 30px 0;
    min-height: calc(100vh - 200px);
}

/* ==========================================================================
   Alerts
   ========================================================================== */

.alert {
    padding: 15px 20px;
    margin-bottom: 20px;
    border-radius: var(--border-radius);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-error {
    background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-success {
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    color: #166534;
    border: 1px solid #bbf7d0;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
    text-align: center;
    padding: 60px 0;
    background: var(--bg-gradient);
    color: white;
    border-radius: var(--border-radius-lg);
    margin-bottom: 30px;
    box-shadow: var(--box-shadow-lg);
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.95;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
}

/* ==========================================================================
   Features
   ========================================================================== */

.features {
    margin-bottom: 50px;
}

.features h2 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 2rem;
    color: var(--dark-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.feature-card {
    background: var(--bg-white);
    padding: 30px 25px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow-lg);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 10px;
    color: var(--dark-color);
}

/* ==========================================================================
   Authentication
   ========================================================================== */

.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
    padding: 50px 0;
}

.auth-card {
    background: var(--bg-white);
    padding: 40px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-lg);
    width: 100%;
    max-width: 450px;
    border: 1px solid var(--border-color);
}

.auth-card h2 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--dark-color);
    font-size: 1.75rem;
}

/* ==========================================================================
   Forms
   ========================================================================== */

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark-color);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--bg-white);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.15);
}

.form-footer {
    margin-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.auth-footer {
    margin-top: 30px;
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.auth-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* ==========================================================================
   Dashboard
   ========================================================================== */

.dashboard-header {
    margin-bottom: 30px;
}

.dashboard-header h1 {
    margin-bottom: 10px;
    color: var(--dark-color);
}

.user-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--bg-white);
    padding: 25px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    display: flex;
    align-items: center;
    gap: 15px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-lg);
}

.stat-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.stat-card h3 {
    font-size: 1rem;
    margin-bottom: 5px;
    color: var(--gray-color);
}

.stat-card p {
    font-size: 1.75rem;
    font-weight: bold;
    color: var(--primary-dark);
}

.dashboard-content {
    display: grid;
    gap: 20px;
}

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
    background: var(--bg-white);
    padding: 25px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    border: 1px solid var(--border-color);
}

.card h2 {
    margin-bottom: 20px;
    color: var(--dark-color);
    font-size: 1.5rem;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

/* ==========================================================================
   Tables
   ========================================================================== */

.user-list {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.user-list th {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.user-list td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--dark-color);
}

.user-list tr:hover {
    background-color: var(--light-color);
}

.user-list tr:last-child td {
    border-bottom: none;
}

/* Status Badges */
.user-list .status-badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
    text-transform: uppercase;
    display: inline-block;
    letter-spacing: 0.3px;
}

.user-list .status-sent {
    background: linear-gradient(135deg, rgba(39, 174, 96, 0.15) 0%, rgba(39, 174, 96, 0.25) 100%);
    color: #166534;
    border: 1px solid rgba(39, 174, 96, 0.3);
}

.user-list .status-failed {
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.15) 0%, rgba(231, 76, 60, 0.25) 100%);
    color: #991b1b;
    border: 1px solid rgba(231, 76, 60, 0.3);
}

.user-list .status-pending {
    background: linear-gradient(135deg, rgba(243, 156, 18, 0.15) 0%, rgba(243, 156, 18, 0.25) 100%);
    color: #92400e;
    border: 1px solid rgba(243, 156, 18, 0.3);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: var(--bg-gradient);
    color: white;
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(14, 165, 233, 0.4);
}

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

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

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color) 0%, #c0392b 100%);
    color: white;
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.3);
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn i {
    font-size: 0.9rem;
}

/* ==========================================================================
   Pagination
   ========================================================================== */

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 25px;
}

.pagination a,
.pagination span {
    padding: 8px 14px;
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--dark-color);
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.pagination a:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.pagination .active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* ==========================================================================
   Filters
   ========================================================================== */

.filter-card {
    margin-bottom: 20px;
    background: var(--bg-white);
    padding: 20px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    border: 1px solid var(--border-color);
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.filter-group label {
    font-weight: 600;
    min-width: 100px;
    color: var(--dark-color);
}

.filter-group input,
.filter-group select {
    padding: 10px 14px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.95rem;
}

/* ==========================================================================
   Admin Dashboard
   ========================================================================== */

.admin-header {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 3px solid var(--primary-color);
}

.admin-header h1 {
    color: var(--dark-color);
    font-size: 2rem;
}

.admin-header p {
    color: var(--gray-color);
    margin-top: 5px;
}

.admin-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 25px;
}

/* Admin Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-bottom: 30px;
}

/* Chart.js Canvas Container */
.card canvas {
    max-width: 400px;
    max-height: 300px;
    margin: 0 auto;
    display: block;
}

.chart-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    min-height: 300px;
}

/* ==========================================================================
   Footer
   ========================================================================== */

footer {
    background: var(--dark-color);
    color: white;
    padding: 30px 0 15px;
    margin-top: 50px;
}

footer .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}

footer h3 {
    margin-bottom: 15px;
    color: var(--primary-light);
}

footer ul {
    list-style: none;
}

footer ul li {
    margin-bottom: 8px;
}

footer ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

footer ul li a:hover {
    color: var(--primary-light);
}

.footer-bottom {
    margin-top: 30px;
    padding-top: 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 15px;
    }
    
    nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    nav a {
        margin: 5px;
        padding: 6px 12px;
        font-size: 0.9rem;
    }
    
    .hero h1 {
        font-size: 1.75rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .user-stats {
        grid-template-columns: 1fr;
    }
    
    .dashboard-content {
        grid-template-columns: 1fr;
    }
    
    .admin-content {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-group {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-group label {
        min-width: auto;
    }
    
    .user-list {
        font-size: 0.85rem;
    }
    
    .user-list th,
    .user-list td {
        padding: 10px 8px;
    }
    
    .auth-card {
        padding: 25px 20px;
        margin: 0 15px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .form-footer {
        flex-direction: column;
        gap: 15px;
    }
    
    .form-footer .btn {
        width: 100%;
    }
}

/* ==========================================================================
   User Dashboard - SMS Form & History
   ========================================================================== */

.form-group label .required-mark {
    color: var(--danger-color) !important;
}

.form-hint {
    display: block;
    margin-top: 6px;
    color: var(--gray-color);
    font-size: 0.85rem;
}

.char-counter {
    display: block;
    margin-top: 6px;
    color: var(--gray-color);
    font-size: 0.85rem;
    text-align: right;
}

.char-counter.over-limit {
    color: var(--danger-color);
    font-weight: 600;
}

.form-group textarea.over-limit {
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.form-group textarea.over-limit:focus {
    box-shadow: 0 0 0 4px rgba(231, 76, 60, 0.15);
}

.table-responsive {
    overflow-x: auto;
}

.user-list .col-date {
    white-space: nowrap;
    font-size: 0.9rem;
    color: var(--gray-color);
}

.user-list .col-phone {
    white-space: nowrap;
    font-family: monospace;
    font-size: 0.95rem;
}

.user-list .col-message {
    max-width: 350px;
    word-wrap: break-word;
    white-space: pre-wrap;
}

.user-list .empty-state {
    text-align: center;
    color: var(--gray-color);
    padding: 30px !important;
    font-style: italic;
}