/* Variable Definitions & Reset */
:root {
    /* Colors - Light Theme */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #4f46e5;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --error-color: #ef4444;
    --highlight-color: #3b82f6;
    
    /* Layout */
    --container-width: 1200px;
    --header-height: 70px;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] {
    /* Colors - Dark Theme */
    --primary-color: #3b82f6;
    --primary-hover: #60a5fa;
    --secondary-color: #6366f1;
    --bg-color: #111827;
    --card-bg: #1f2937;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --border-color: #374151;
    --highlight-color: #60a5fa;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: --bg-color; /* Fallback */
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    transition: background-color 0.3s ease, color 0.3s ease;
}

body.no-scroll {
    overflow: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s;
}

ul {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    font-family: inherit;
    background: none;
}

input, select {
    font-family: inherit;
    outline: none;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
.site-header {
    height: var(--header-height);
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.logo-icon.small {
    width: 32px;
    height: 32px;
    font-size: 1rem;
}

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

.main-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
}

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

.premium-btn {
    background-color: #f59e0b; /* Amber 500 */
    color: white !important;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    transition: background-color 0.2s;
}

.premium-btn:hover {
    background-color: #d97706;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    background-color: transparent;
    transition: background-color 0.2s, color 0.2s;
    font-size: 1.25rem;
}

.icon-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--primary-color);
}

[data-theme="dark"] .icon-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    color: var(--text-primary);
}

/* Mobile Menu */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 200;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s;
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: -300px;
    width: 300px;
    height: 100%;
    background-color: var(--card-bg);
    z-index: 201;
    transition: right 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    padding: 1.5rem;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.close-menu-btn {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.mobile-nav-links li {
    margin-bottom: 1rem;
}

.mobile-nav-links a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: background-color 0.2s;
}

.mobile-nav-links a:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .mobile-nav-links a:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.mobile-nav-links i {
    width: 20px;
    text-align: center;
    color: var(--primary-color);
}

.premium-link {
    color: #f59e0b !important;
}

/* Ads */
.ad-container {
    width: 100%;
    margin: 1.5rem 0;
    display: flex;
    justify-content: center;
}

.ad-placeholder {
    width: 728px;
    height: 90px;
    background-color: rgba(0, 0, 0, 0.05);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    max-width: 100%;
}

[data-theme="dark"] .ad-placeholder {
    background-color: rgba(255, 255, 255, 0.05);
}

/* Hero Section */
.hero-section {
    padding: 3rem 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto 3rem;
}

.hero-content h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Email Card */
.email-card {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 2rem;
    max-width: 800px;
    margin: 0 auto;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

/* Glassmorphism accent */
.email-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.email-display-container {
    position: relative;
    display: flex;
    align-items: center;
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.email-input {
    flex: 1;
    background: transparent;
    border: none;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    width: 100%;
}

.copy-btn {
    background-color: var(--primary-color);
    color: white;
    border-radius: var(--radius-sm);
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: background-color 0.2s, transform 0.1s;
    position: relative;
}

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

.copy-btn:active {
    transform: translateY(1px);
}

.tooltip {
    position: absolute;
    top: -40px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #333;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, top 0.2s;
    white-space: nowrap;
}

.tooltip::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    border-width: 4px 4px 0;
    border-style: solid;
    border-color: #333 transparent transparent transparent;
}

.copy-btn:active .tooltip {
    opacity: 1;
    visibility: visible;
    top: -45px;
}

.loading-spinner {
    position: absolute;
    right: 120px;
    color: var(--primary-color);
}

.email-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.control-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: all 0.2s;
}

.control-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.05); /* very light primary */
}

.control-btn i {
    font-size: 1.1em;
}

.refresh-btn:hover i {
    animation: spin 1s linear infinite;
}

.delete-btn {
    color: var(--error-color);
    border-color: rgba(239, 68, 68, 0.3);
}

.delete-btn:hover {
    border-color: var(--error-color);
    color: var(--error-color);
    background-color: rgba(239, 68, 68, 0.05);
}

.auto-refresh-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Switch Toggle */
.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--success-color);
}

input:checked + .slider:before {
    transform: translateX(20px);
}

[data-theme="dark"] .slider {
    background-color: #4b5563;
}

.interval-select {
    padding: 0.25rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--bg-color);
    color: var(--text-primary);
}

/* Inbox Section */
.inbox-section {
    padding: 3rem 0;
}

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

.inbox-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.inbox-header i {
    color: var(--primary-color);
}

.search-box {
    position: relative;
}

.search-box i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.search-box input {
    padding: 0.625rem 1rem 0.625rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--card-bg);
    color: var(--text-primary);
    width: 250px;
    transition: border-color 0.2s;
}

.search-box input:focus {
    border-color: var(--primary-color);
}

.inbox-container {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
    min-height: 400px;
}

.email-table {
    width: 100%;
    border-collapse: collapse;
}

.email-table th {
    padding: 1rem 1.5rem;
    text-align: left;
    background-color: var(--bg-color);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.875rem;
    border-bottom: 1px solid var(--border-color);
}

.email-table td {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.email-table tr:last-child td {
    border-bottom: none;
}

.email-table tbody tr {
    transition: background-color 0.2s;
}

.email-table tbody tr:not(.empty-state):hover {
    background-color: var(--bg-color);
}

.col-sender { width: 25%; }
.col-subject { width: 45%; }
.col-time { width: 15%; }
.col-actions { width: 15%; text-align: center; }

/* Empty state */
.empty-state td {
    padding: 4rem 1rem;
    text-align: center;
}

.empty-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--text-secondary);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    color: var(--border-color);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    background-color: var(--card-bg);
    border-left: 4px solid var(--primary-color);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    z-index: 1000;
    transform: translateY(0);
    transition: transform 0.3s ease, opacity 0.3s ease;
    font-weight: 500;
    max-width: 350px;
}

.toast.hidden {
    transform: translateY(100%);
    opacity: 0;
    pointer-events: none;
}

/* Features Section */
.features-section {
    padding: 3rem 0;
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 1.5rem;
    text-align: center;
}

.feature-icon {
    width: 60px;
    height: 60px;
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin: 0 auto 1.25rem;
}

.feature-card h3 {
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Footer */
.site-footer {
    background-color: var(--card-bg);
    padding: 4rem 0 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-brand {
    max-width: 300px;
}

.footer-brand .logo {
    margin-bottom: 1rem;
}

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

.footer-links {
    display: flex;
    gap: 4rem;
    flex-wrap: wrap;
}

.link-group h4 {
    color: var(--text-primary);
    margin-bottom: 1.25rem;
    font-weight: 700;
}

.link-group ul li {
    margin-bottom: 0.75rem;
}

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

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.social-links {
    display: flex;
    gap: 1.25rem;
}

.social-links a {
    color: var(--text-secondary);
    font-size: 1.25rem;
}

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

/* Animations */
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Media Queries */
@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero-content h1 {
        font-size: 1.8rem;
    }

    .email-display-container {
        flex-direction: column;
        padding: 0.5rem;
    }
    
    .loading-spinner {
        right: 1.5rem;
        top: 2.2rem;
    }

    .copy-btn {
        width: 100%;
        justify-content: center;
        margin-top: 0.5rem;
    }

    .email-card {
        padding: 1rem;
    }

    .inbox-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .search-box, .search-box input {
        width: 100%;
    }

    /* Table responsive */
    .email-table thead {
        display: none;
    }

    .email-table, .email-table tbody, .email-table tr, .email-table td {
        display: block;
        width: 100%;
    }

    .email-table tr {
        margin-bottom: 1rem;
        background-color: var(--card-bg);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-md);
        padding: 1rem;
    }
    
    .email-table td {
        padding: 0.5rem 0;
        border-bottom: none;
        text-align: left;
    }

    .email-table td:first-child {
        font-weight: 600;
        color: var(--primary-color);
    }
    
    .col-sender, .col-subject, .col-time, .col-actions {
        width: 100% !important;
    }
    
    .email-table .email-actions {
        display: flex;
        justify-content: flex-end;
        gap: 1rem;
        margin-top: 0.5rem;
        padding-top: 0.5rem;
        border-top: 1px solid var(--border-color);
    }

    .footer-content {
        flex-direction: column;
        gap: 2rem;
    }
    
    .footer-links {
        gap: 2rem;
        width: 100%;
        justify-content: space-between;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
}