/* ========================================
   SeismoSense - Professional Dark Theme
   ======================================== */

:root {
    /* Dark Theme Colors */
    --bg-primary: #0a0e14;
    --bg-secondary: #111820;
    --bg-tertiary: #1a222d;
    --bg-card: #151c26;
    --bg-input: #0d1218;
    
    /* Accent Colors */
    --accent: #00d4aa;
    --accent-hover: #00f5c4;
    --accent-muted: #00a88a;
    
    /* Text Colors */
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    
    /* Alert Colors */
    --green: #22c55e;
    --green-bg: rgba(34, 197, 94, 0.15);
    --orange: #f97316;
    --orange-bg: rgba(249, 115, 22, 0.15);
    --red: #ef4444;
    --red-bg: rgba(239, 68, 68, 0.15);
    --yellow: #eab308;
    --yellow-bg: rgba(234, 179, 8, 0.15);
    
    /* UI Elements */
    --border: #30363d;
    --border-focus: var(--accent);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(0, 212, 170, 0.15);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* Background Pattern */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(0, 212, 170, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(0, 212, 170, 0.05) 0%, transparent 50%),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 50px,
            rgba(0, 212, 170, 0.02) 50px,
            rgba(0, 212, 170, 0.02) 51px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 50px,
            rgba(0, 212, 170, 0.02) 50px,
            rgba(0, 212, 170, 0.02) 51px
        );
    pointer-events: none;
    z-index: -1;
}

/* Header */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), #00f5c4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    gap: 0.5rem;
}

.nav-tab {
    padding: 0.625rem 1.25rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-tab:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.nav-tab.active {
    color: var(--accent);
    background: rgba(0, 212, 170, 0.1);
}

.nav-tab i {
    font-size: 0.85rem;
}

/* Main Content */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Tab Panels */
.tab-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media (max-width: 1024px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

/* Form Styles */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.form-label .required {
    color: var(--red);
}

.form-input {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.15);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-help {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.375rem;
}

/* Button */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-muted));
    color: var(--bg-primary);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
    margin-top: 0.5rem;
}

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

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

.btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.btn i {
    font-size: 1rem;
}

/* Button row: two buttons side by side */
.btn-row {
    display: flex;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.btn-row .btn {
    margin-top: 0;
    flex: 1;
}

/* Secondary / ghost button (Clear) */
.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--text-secondary);
    box-shadow: none;
}


/* Spinner */
.spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Result Display */
.result-card {
    margin-top: 1.5rem;
    padding: 1.5rem;
    border-radius: 12px;
    animation: slideIn 0.4s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-card.green {
    background: var(--green-bg);
    border: 1px solid var(--green);
}

.result-card.orange {
    background: var(--orange-bg);
    border: 1px solid var(--orange);
}

.result-card.red {
    background: var(--red-bg);
    border: 1px solid var(--red);
}

.result-card.yellow {
    background: var(--yellow-bg);
    border: 1px solid var(--yellow);
}

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

.result-label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.result-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.result-card.green .result-value { color: var(--green); }
.result-card.orange .result-value { color: var(--orange); }
.result-card.red .result-value { color: var(--red); }
.result-card.yellow .result-value { color: var(--yellow); }

.confidence-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    margin: 0.75rem 0;
}

.confidence-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.confidence-fill.green { background: var(--green); }
.confidence-fill.orange { background: var(--orange); }
.confidence-fill.red { background: var(--red); }
.confidence-fill.yellow { background: var(--yellow); }

.confidence-text {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.confidence-text span {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    color: var(--text-primary);
}

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

.stat-item {
    background: var(--bg-tertiary);
    border-radius: 10px;
    padding: 1rem;
    text-align: center;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.25rem;
}

/* Confusion Matrix */
.conf-matrix-container {
    text-align: center;
    padding: 1rem;
}

.conf-matrix-img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
}

/* Alert Level Cards */
.alert-levels {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-top: 1.5rem;
}

.alert-level {
    padding: 1rem;
    border-radius: 10px;
    text-align: center;
}

.alert-level.green {
    background: var(--green-bg);
    border: 1px solid var(--green);
}

.alert-level.orange {
    background: var(--orange-bg);
    border: 1px solid var(--orange);
}

.alert-level.red {
    background: var(--red-bg);
    border: 1px solid var(--red);
}

.alert-level.yellow {
    background: var(--yellow-bg);
    border: 1px solid var(--yellow);
}

.alert-level-icon {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.alert-level.green .alert-level-icon { color: var(--green); }
.alert-level.orange .alert-level-icon { color: var(--orange); }
.alert-level.red .alert-level-icon { color: var(--red); }
.alert-level.yellow .alert-level-icon { color: var(--yellow); }

.alert-level-name {
    font-weight: 600;
    font-size: 0.9rem;
}

.alert-level.green .alert-level-name { color: var(--green); }
.alert-level.orange .alert-level-name { color: var(--orange); }
.alert-level.red .alert-level-name { color: var(--red); }
.alert-level.yellow .alert-level-name { color: var(--yellow); }

.alert-level-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* About Section */
.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.about-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.about-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.feature-list {
    list-style: none;
    margin-top: 1rem;
}

.feature-list li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.feature-list li i {
    color: var(--accent);
    font-size: 0.85rem;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.tech-badge {
    padding: 0.375rem 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

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

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.footer-brand span:first-child {
    font-weight: 600;
    color: var(--accent);
}

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

.footer-links {
    display: flex;
    gap: 1rem;
}

.footer-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

.footer-link svg {
    width: 18px;
    height: 18px;
}

.footer-link:hover {
    color: var(--accent);
}

.footer-copyright {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-link-inline {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}

.footer-link-inline:hover {
    text-decoration: underline;
}

/* Error State */
.error-message {
    background: var(--red-bg);
    border: 1px solid var(--red);
    border-radius: 10px;
    padding: 1rem;
    color: var(--red);
    font-size: 0.9rem;
    margin-top: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Empty Result State */
.empty-result {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    text-align: center;
}

.empty-icon {
    width: 80px;
    height: 80px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.empty-icon i {
    font-size: 2rem;
    color: var(--accent);
    opacity: 0.5;
}

.empty-text {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 90px;
    right: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    animation: toast-in 0.3s ease;
    max-width: 350px;
    box-shadow: var(--shadow-lg);
}

.toast.toast-out {
    animation: toast-out 0.3s ease forwards;
}

@keyframes toast-in {
    from { opacity: 0; transform: translateX(100%); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes toast-out {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(100%); }
}

.toast-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.toast.success .toast-icon { color: var(--green); }
.toast.error .toast-icon { color: var(--red); }
.toast.warning .toast-icon { color: var(--yellow); }
.toast.info .toast-icon { color: var(--accent); }

.toast-message {
    font-size: 0.9rem;
    color: var(--text-primary);
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        padding: 0 1rem;
    }
    
    .header-content {
        flex-direction: column;
        height: auto;
        padding: 1rem 0;
        gap: 1rem;
    }
    
    .nav-tabs {
        width: 100%;
        justify-content: center;
    }
    
    .nav-tab {
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
    }
    
    .nav-tab span {
        display: none;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .alert-levels {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .toast-container {
        left: 1rem;
        right: 1rem;
    }
    
    .toast {
        max-width: 100%;
    }
}