/* CSS Variables */
:root {
    --primary-color: #007bff;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    
    /* Light theme colors */
    --bg-color: #ffffff;
    --text-color: #333333;
    --text-secondary: #6c757d;
    --card-bg: #ffffff;
    --border-color: #dee2e6;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --hover-shadow: 0 4px 8px rgba(0,0,0,0.15);
    --input-bg: #ffffff;
    --input-border: #ced4da;
    --input-text: #495057;
    --button-hover: #0056b3;
    --navbar-bg: #007bff;
    --navbar-text: #ffffff;
    --menu-bg: #ffffff;
    --menu-text: #333333;
    --menu-hover: #f8f9fa;
    --alert-bg: #f8f9fa;
    --alert-border: #dee2e6;
    --copy-label-bg: rgba(0,123,255,0.1);
    --copy-label-text: #007bff;
    --fade-in-bg: rgba(255,255,255,0.95);
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a1a1a;
        --text-color: #e0e0e0;
        --text-secondary: #b0b0b0;
        --card-bg: #2d2d2d;
        --border-color: #404040;
        --shadow: 0 2px 4px rgba(0,0,0,0.3);
        --hover-shadow: 0 4px 8px rgba(0,0,0,0.4);
        --input-bg: #3a3a3a;
        --input-border: #555555;
        --input-text: #e0e0e0;
        --button-hover: #0056b3;
        --navbar-bg: #1e1e1e;
        --navbar-text: #ffffff;
        --menu-bg: #2d2d2d;
        --menu-text: #e0e0e0;
        --menu-hover: #404040;
        --alert-bg: #2d2d2d;
        --alert-border: #404040;
        --copy-label-bg: rgba(0,123,255,0.2);
        --copy-label-text: #4da6ff;
        --fade-in-bg: rgba(45,45,45,0.95);
    }
}

/* Manual dark theme toggle */
body.dark-theme {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --text-secondary: #b0b0b0;
    --card-bg: #2d2d2d;
    --border-color: #404040;
    --shadow: 0 2px 4px rgba(0,0,0,0.3);
    --hover-shadow: 0 4px 8px rgba(0,0,0,0.4);
    --input-bg: #3a3a3a;
    --input-border: #555555;
    --input-text: #e0e0e0;
    --button-hover: #0056b3;
    --navbar-bg: #1e1e1e;
    --navbar-text: #ffffff;
    --menu-bg: #2d2d2d;
    --menu-text: #e0e0e0;
    --menu-hover: #404040;
    --alert-bg: #2d2d2d;
    --alert-border: #404040;
    --copy-label-bg: rgba(0,123,255,0.2);
    --copy-label-text: #4da6ff;
    --fade-in-bg: rgba(45,45,45,0.95);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Main Content */
.main-content {
    padding-top: 1rem;
    min-height: calc(100vh - 80px);
}

/* Navigation */
.navbar {
    background-color: var(--navbar-bg);
    padding: 0.5rem 1rem;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

/* Ẩn nút menu (hamburger) toàn bộ trang */
.navbar-toggler {
    display: none !important;
}

.navbar-nav {
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
    flex-direction: row; /* Luôn sắp xếp theo hàng ngang */
    display: flex; /* Luôn hiển thị menu */
}

.navbar-nav.show { /* vẫn giữ để không phá vỡ JS hiện có */
    display: flex;
}

.nav-link {
    color: var(--navbar-text) !important;
    text-decoration: none;
    padding: 0.75rem 1rem !important;
    border-radius: 8px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
    font-size: 0.9rem;
    flex: 0 0 auto;
}

.nav-link:hover {
    background-color: rgba(255,255,255,0.1);
    color: var(--navbar-text) !important;
    transform: translateY(-1px);
}

.nav-link.active {
    background-color: rgba(255,255,255,0.2);
    font-weight: bold;
}

.nav-link i {
    font-size: 1.2rem;
}

.menu-text {
    display: inline;
}

.navbar-toggler {
    display: block;
    background: none;
    border: none;
    color: var(--navbar-text);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: background-color 0.3s ease;
}

.navbar-toggler:hover {
    background-color: rgba(255,255,255,0.1);
}

/* Container and Cards */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

.card {
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
    transition: box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

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

.card-header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 12px 12px 0 0;
    font-size: 1.2rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-body {
    padding: 1.5rem;
}

/* Grid Layout */
.grid-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    align-items: start;
}

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

.column.center {
    justify-content: center;
    align-items: center;
    gap: 1rem;
}

/* Form Elements */
input, textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--input-border);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: inherit;
    background-color: var(--input-bg);
    color: var(--input-text);
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

textarea {
    min-height: 120px;
    resize: vertical;
}

label {
    font-weight: bold;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    display: block;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    font-weight: 500;
    min-height: 44px; /* Touch target size */
}

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

.btn-primary:hover {
    background-color: var(--button-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background-color: #545b62;
    transform: translateY(-2px);
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-success:hover {
    background-color: #1e7e34;
    transform: translateY(-2px);
}

.btn-info {
    background-color: var(--info-color);
    color: white;
}

.btn-info:hover {
    background-color: #138496;
    transform: translateY(-2px);
}

.btn-warning {
    background-color: var(--warning-color);
    color: var(--text-color);
}

.btn-warning:hover {
    background-color: #e0a800;
    transform: translateY(-2px);
}

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

.btn-danger:hover {
    background-color: #c82333;
    transform: translateY(-2px);
}

/* OTP Specific Styles */
.otp-container {
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
}

.input-group {
    margin-bottom: 1.5rem;
}

.otp-display {
    text-align: center;
    margin-top: 1.5rem;
}

.otp-label {
    font-size: 1.1em;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.otp-code {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin: 1rem 0;
    font-family: 'Courier New', monospace;
    letter-spacing: 0.5rem;
}

.timer {
    color: var(--text-color);
    margin-bottom: 1rem;
}

.button-group {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.copy-label {
    color: var(--copy-label-text);
    font-size: 0.9rem;
    margin-top: 0.5rem;
    visibility: hidden;
    transition: visibility 0.3s ease;
}

/* Dashboard Styles */
.dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.dashboard-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: box-shadow 0.3s ease;
    color: var(--text-color);
}

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

.dashboard-card h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Energy Grid */
.energy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.energy-item {
    text-align: center;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.energy-label {
    font-size: 0.9em;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.energy-value {
    font-size: 1.5em;
    font-weight: bold;
    color: var(--primary-color);
}

.energy-unit {
    font-size: 0.8em;
    color: var(--text-secondary);
}

/* Runtime Grid */
runtime-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.runtime-item {
    text-align: center;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.runtime-label {
    font-size: 0.9em;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.runtime-value {
    font-size: 1.3em;
    font-weight: bold;
    color: var(--primary-color);
}

.runtime-unit {
    font-size: 0.8em;
    color: var(--text-secondary);
}

/* Power Display */
.power-display, .voltage-display, .status-display {
    text-align: center;
    padding: 1.5rem;
    background: var(--card-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.power-value, .voltage-value, .status-value {
    font-size: 2.5em;
    font-weight: bold;
    color: var(--primary-color);
    margin: 0.5rem 0;
}

.power-unit, .voltage-unit {
    font-size: 1.1em;
    color: var(--text-secondary);
}

/* Consumption Grid */
.consumption-grid, .bill-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.consumption-item, .bill-item {
    text-align: center;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.consumption-label, .bill-label {
    font-size: 0.9em;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.consumption-value, .bill-value {
    font-size: 1.3em;
    font-weight: bold;
    color: var(--primary-color);
}

.consumption-unit, .bill-unit {
    font-size: 0.8em;
    color: var(--text-secondary);
}

/* Name Generator */
.generated-name {
    padding: 2rem;
    background: var(--card-bg);
    border-radius: 15px;
    margin: 1.5rem 0;
    border: 1px solid var(--border-color);
}

/* Feature List */
.feature-list {
    margin: 1.5rem 0;
    padding: 0;
    list-style-type: none;
}

.feature-list li {
    display: flex;
    align-items: center;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.feature-list i {
    color: var(--success-color);
    margin-right: 0.5rem;
}

/* Last Updated */
.last-updated {
    text-align: center;
    color: var(--text-color);
    font-size: 0.9rem;
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--alert-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border: 1px solid var(--alert-border);
    background-color: var(--alert-bg);
}

.alert-success {
    background-color: rgba(40,167,69,0.1);
    border-color: var(--success-color);
    color: var(--success-color);
}

.alert-danger {
    background-color: rgba(220,53,69,0.1);
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.alert-warning {
    background-color: rgba(255,193,7,0.1);
    border-color: var(--warning-color);
    color: var(--text-color);
}

.alert-info {
    background-color: rgba(23,162,184,0.1);
    border-color: var(--info-color);
    color: var(--info-color);
}

/* Animations */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Dark theme toggle button */
.theme-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 56px;
    height: 56px;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--hover-shadow);
}

/* Chart containers */
.chart-container {
    margin: 1rem 0;
    height: 300px;
    position: relative;
}

/* Status indicators */
.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.status-indicator.online {
    background-color: rgba(40,167,69,0.1);
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

.status-indicator.offline {
    background-color: rgba(220,53,69,0.1);
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
}

.status-indicator.connecting {
    background-color: rgba(255,193,7,0.1);
    color: var(--warning-color);
    border: 1px solid var(--warning-color);
}

/* Material Icons */
.material-icons {
    font-family: 'Material Icons';
    font-weight: normal;
    font-style: normal;
    font-size: 24px;
    line-height: 1;
    letter-spacing: normal;
    text-transform: none;
    display: inline-block;
    white-space: nowrap;
    word-wrap: normal;
    direction: ltr;
    -webkit-font-feature-settings: 'liga';
    -webkit-font-smoothing: antialiased;
}

/* Text muted for dark theme */
.text-muted {
    color: var(--text-secondary) !important;
}

/* OCR Korean: image zoom & scroll */
.image-scroll {
    width: 100%;
    height: 32.5vh; /* Giảm 50% chiều cao khung cố định */
    overflow: auto; /* Hiện thanh cuộn X/Y khi nội dung vượt khung */
    background: var(--card-bg);
    scrollbar-gutter: stable both-edges; /* Tránh dịch chuyển layout khi xuất hiện scrollbar */
    cursor: grab; /* Trực quan hành vi kéo */
    -webkit-overflow-scrolling: touch; /* Mượt trên mobile */
}

.image-zoom {
    display: block;
    max-width: none; /* Cho phép vượt khung để zoom lớn hơn */
    height: auto; /* Giữ tỉ lệ ảnh khi thay đổi width */
}

.image-scroll.dragging {
    cursor: grabbing;
}

.korean-box {
    background: var(--card-bg);
    border-left: 4px solid var(--primary-color);
    color: var(--text-color);
}

/* Responsive Design */
@media (min-width: 769px) {
    .navbar-toggler { display: none; }
    
    .navbar-nav {
        display: flex; /* Luôn hiển thị ở desktop */
    }
}

@media (max-width: 1200px) {
    .navbar-nav {
        flex-wrap: wrap;
        justify-content: center;
        max-width: 100%;
        gap: 0.4rem;
    }
    
    .nav-link {
        padding: 0.5rem 0.75rem !important;
        font-size: 0.85rem;
        min-width: auto;
        flex: 0 0 auto;
    }
    
    .nav-link i {
        font-size: 1.1rem;
    }
}

@media (max-width: 992px) {
    .navbar-nav {
        gap: 0.25rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav-link {
        padding: 0.4rem 0.6rem !important;
        font-size: 0.8rem;
        flex: 0 0 auto;
        display: flex;
        align-items: center;
        gap: 0.3rem;
    }
    
    .menu-text {
        display: inline;
    }
    
    .nav-link i {
        font-size: 1.1rem;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0.5rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .card-header {
        padding: 1rem;
        font-size: 1.1rem;
    }
    
    .navbar-nav {
        flex-direction: row;
        flex-wrap: wrap;
        width: 100%;
        gap: 0.25rem;
        justify-content: center;
        display: flex; /* Luôn hiển thị ở mobile */
    }
    
    .nav-link {
        padding: 0.5rem !important;
        font-size: 0.75rem;
        flex: 0 0 auto;
        display: flex;
        align-items: center;
        gap: 0.3rem;
        min-width: auto;
    }
    
    .menu-text {
        display: inline;
        font-size: 0.7rem;
        margin-top: 0.2rem;
    }
    
    .navbar-toggler { display: none; }
    

    
    .dashboard {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .energy-grid, .runtime-grid, .consumption-grid, .bill-grid {
        grid-template-columns: 1fr;
    }
    
    .button-group {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .otp-code {
        font-size: 2rem;
        letter-spacing: 0.25rem;
    }
    
    .power-value, .voltage-value, .status-value {
        font-size: 2rem;
    }
    
    .theme-toggle {
        width: 48px;
        height: 48px;
        bottom: 15px;
        right: 15px;
    }
    
    .chart-container {
        height: 250px;
    }
    
    .grid-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .column.center {
        order: -1;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0.25rem;
    }
    
    .card-body {
        padding: 0.75rem;
    }
    
    .card-header {
        padding: 0.75rem;
        font-size: 1rem;
    }
    
    .navbar-nav {
        gap: 0.15rem;
    }
    
    .nav-link {
        padding: 0.4rem !important;
        font-size: 0.7rem;
        min-width: auto;
        flex: 0 0 auto;
        display: flex;
        align-items: center;
        gap: 0.25rem;
    }
    
    .nav-link i {
        font-size: 1.1rem;
    }
    
    .menu-text {
        font-size: 0.65rem;
    }
    
    .otp-code {
        font-size: 1.5rem;
        letter-spacing: 0.2rem;
    }
    
    .power-value, .voltage-value, .status-value {
        font-size: 1.5rem;
    }
    
    .btn {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }
    
    .theme-toggle {
        width: 44px;
        height: 44px;
        bottom: 10px;
        right: 10px;
    }
    
    .chart-container {
        height: 200px;
    }
    
    .nav-link {
        padding: 0.5rem !important;
        font-size: 0.85rem;
    }
    
    .nav-link i {
        font-size: 1rem;
    }
}

/* Touch optimizations */
@media (hover: none) and (pointer: coarse) {
    .btn:hover {
        transform: none;
    }
    
    .card:hover {
        box-shadow: var(--shadow);
    }
    
    .nav-link:hover {
        transform: none;
    }
    
    .theme-toggle:hover {
        transform: none;
    }
}

/* Rewards Module Styles */
.rewards-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem;
}

.rewards-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.rewards-title {
    color: var(--text-color);
    font-size: 2rem;
    font-weight: bold;
    margin: 0;
}

.rewards-nav {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.rewards-nav a {
    color: var(--primary-color);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.rewards-nav a:hover {
    background-color: rgba(0, 123, 255, 0.1);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

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

.stat-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.stat-icon.accounts { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.stat-icon.points { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
.stat-icon.today { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.stat-icon.runs { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }

.stat-content h3 {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--text-color);
    margin: 0.5rem 0 0 0;
}

/* Controls Section */
.controls-section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.controls-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.controls-title {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--text-color);
    margin: 0;
}

.refresh-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.refresh-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success-color);
}

.controls-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr auto;
    gap: 1rem;
    align-items: end;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-color);
    margin: 0;
}

.control-group input,
.control-group select {
    padding: 0.75rem;
    border: 2px solid var(--input-border);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--input-text);
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.control-group input:focus,
.control-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.btn-group {
    display: flex;
    gap: 0.5rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    border-radius: 6px;
}

/* Table Styles */
.table-container {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.table-header {
    background: var(--primary-color);
    color: white;
    padding: 1rem 1.5rem;
    font-size: 1.1rem;
    font-weight: bold;
}

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

.rewards-table {
    width: 100%;
    border-collapse: collapse;
    margin: 0;
}

.rewards-table th,
.rewards-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.rewards-table th {
    background: var(--card-bg);
    font-weight: 600;
    color: var(--text-color);
    position: sticky;
    top: 0;
    z-index: 10;
    cursor: pointer;
    user-select: none;
    transition: background-color 0.3s ease;
}

.rewards-table th:hover {
    background: rgba(0, 123, 255, 0.05);
}

.rewards-table th.sortable::after {
    content: '↕';
    margin-left: 0.5rem;
    opacity: 0.5;
}

.rewards-table th.sort-asc::after {
    content: '↑';
    opacity: 1;
    color: var(--primary-color);
}

.rewards-table th.sort-desc::after {
    content: '↓';
    opacity: 1;
    color: var(--primary-color);
}

.rewards-table td {
    color: var(--text-color);
    vertical-align: middle;
}

.rewards-table tbody tr {
    transition: background-color 0.3s ease;
}

.rewards-table tbody tr:hover {
    background: rgba(0, 123, 255, 0.05);
}

.email-cell {
    font-weight: 500;
    color: var(--primary-color);
}

.points-cell {
    font-weight: 600;
    text-align: right;
}

.points-positive {
    color: var(--success-color);
}

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

.timestamp-cell {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Pagination */
.pagination-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 1rem;
}

.pagination-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.pagination {
    display: flex;
    gap: 0.25rem;
    align-items: center;
}

.pagination a,
.pagination span {
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    text-decoration: none;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    min-width: 40px;
    text-align: center;
}

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

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

.pagination .disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination .disabled:hover {
    background: transparent;
    color: var(--text-color);
    border-color: var(--border-color);
}

/* Admin Styles */
.admin-section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.admin-section h3 {
    color: var(--text-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 1rem;
    align-items: end;
    margin-bottom: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: var(--text-color);
}

.form-group input,
.form-group textarea {
    padding: 0.75rem;
    border: 2px solid var(--input-border);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--input-text);
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.client-list {
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.client-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s ease;
}

.client-item:last-child {
    border-bottom: none;
}

.client-item:hover {
    background: rgba(0, 123, 255, 0.05);
}

.client-email {
    font-weight: 500;
    color: var(--text-color);
}

.client-status {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.client-status.active {
    background: rgba(40, 167, 69, 0.1);
    color: var(--success-color);
}

.client-status.inactive {
    background: rgba(220, 53, 69, 0.1);
    color: var(--danger-color);
}

.btn-remove {
    background: var(--danger-color);
    color: white;
    border: none;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-remove:hover {
    background: #c82333;
}

/* Settings Grid */
.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.setting-item label {
    font-weight: 500;
    color: var(--text-color);
}

.setting-item input {
    padding: 0.75rem;
    border: 2px solid var(--input-border);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--input-text);
}

.setting-item input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

/* Flash Messages */
.flash-messages {
    margin-bottom: 1rem;
}

.flash-message {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 0.5rem;
    border-left: 4px solid;
}

.flash-message.success {
    background: rgba(40, 167, 69, 0.1);
    border-color: var(--success-color);
    color: var(--success-color);
}

.flash-message.error {
    background: rgba(220, 53, 69, 0.1);
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.flash-message.info {
    background: rgba(23, 162, 184, 0.1);
    border-color: var(--info-color);
    color: var(--info-color);
}

/* Responsive Design for Rewards */
@media (max-width: 768px) {
    .rewards-header {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }
    
    .rewards-nav {
        justify-content: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .controls-row {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .btn-group {
        justify-content: center;
    }
    
    .table-responsive {
        font-size: 0.9rem;
    }
    
    .rewards-table th,
    .rewards-table td {
        padding: 0.75rem 0.5rem;
    }
    
    .pagination-container {
        flex-direction: column;
        text-align: center;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .settings-grid {
        grid-template-columns: 1fr;
    }
}

/* Text color override for Collection dark interface */
.collection-page h1,
.collection-page h2,
.collection-page h3,
.collection-page h4,
.collection-page h5,
.collection-page h6,
.collection-page p,
.collection-page span,
.collection-page div,
.collection-page small,
.collection-page label,
.collection-page textarea {
    color: var(--text-color) !important;
}

.collection-page .form-text {
    color: var(--text-secondary) !important;
}

/* Nếu có phần tử dùng text-dark của Bootstrap, chuyển sang màu chữ của theme tối */
.collection-page .text-dark {
    color: var(--text-color) !important;
}

/* Badge trong trang Collection hiển thị chữ trắng trên nền màu */
.collection-page .badge {
    color: #fff !important;
}