/* ==========================================
   CSS RESET & BASE STYLES
   ========================================== */

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

:root {
    /* Color System */
    --bg-primary: #0F172A;
    --surface-dark: #111827;
    --card-bg: #1F2937;
    --text-primary: #FFFFFF;
    --safe-green: #22C55E;
    --caution-yellow: #F59E0B;
    --risk-red: #EF4444;
    --accent-cyan: #22D3EE;
    --muted: #9CA3AF;
    
    /* Risk Level Colors */
    --risk-safe: var(--safe-green);
    --risk-caution: var(--caution-yellow);
    --risk-high: var(--risk-red);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================
   ACCESSIBILITY
   ========================================== */

.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--accent-cyan);
    color: var(--bg-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    border-radius: var(--radius-sm);
    z-index: 1000;
    font-weight: 600;
}

.skip-link:focus {
    top: 6px;
}

/* Focus styles for better accessibility */
button:focus,
input:focus,
[tabindex]:focus {
    outline: 2px solid var(--accent-cyan);
    outline-offset: 2px;
}

/* ==========================================
   LAYOUT
   ========================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.section {
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

/* ==========================================
   HEADER
   ========================================== */

.header {
    background: var(--surface-dark);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: var(--font-size-2xl);
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
}

.brand {
    font-size: var(--font-size-sm);
    color: var(--muted);
    margin-left: auto;
}

.location-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.manual-location {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-width: 500px;
    margin: 0 auto;
}

.pin-input-container {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.pin-input-container input {
    flex: 1;
    min-width: 0;
    font-size: var(--font-size-base);
    text-align: center;
    letter-spacing: 1px;
}

.pin-input-container input:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.1);
}

.pin-input-container .btn {
    min-width: 120px;
    font-weight: 600;
}

/* PIN Suggestions */
.pin-suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.suggestions-label {
    font-size: var(--font-size-sm);
    color: var(--muted);
    margin-right: var(--spacing-sm);
    white-space: nowrap;
}

.pin-suggestion {
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--text-primary);
    font-size: var(--font-size-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.pin-suggestion:hover {
    background: var(--surface-dark);
    border-color: var(--accent-cyan);
    transform: translateY(-1px);
}

.pin-suggestion:active {
    transform: translateY(0);
}

@media (max-width: 640px) {
    .pin-suggestions {
        justify-content: flex-start;
    }
    
    .pin-input-container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .pin-input-container .btn {
        width: 100%;
    }
}

/* PIN code specific styling */
#pin-input {
    background: var(--card-bg);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-lg);
    font-weight: 600;
    text-align: center;
    letter-spacing: 2px;
    transition: all var(--transition-normal);
}

#pin-input:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.15);
    transform: translateY(-1px);
}

#pin-input::placeholder {
    color: var(--muted);
    font-weight: 400;
    letter-spacing: normal;
}

@media (min-width: 768px) {
    .header-content {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }
    
    .location-controls {
        flex-direction: row;
        align-items: center;
    }
}

/* ==========================================
   BUTTONS
   ========================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    min-height: 44px; /* Touch target */
}

.btn-primary {
    background: var(--accent-cyan);
    color: var(--bg-primary);
}

.btn-primary:hover {
    background: #06b6d4;
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: var(--surface-dark);
    border-color: var(--accent-cyan);
}

/* ==========================================
   FORM ELEMENTS
   ========================================== */

input[type="text"] {
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: var(--font-size-sm);
    min-height: 44px;
    transition: all var(--transition-fast);
}

input[type="text"]:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.1);
}

input[type="text"]::placeholder {
    color: var(--muted);
}

/* Checkbox Styles */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.checkbox-label:hover {
    background: rgba(255, 255, 255, 0.05);
}

.checkbox-label input[type="checkbox"] {
    appearance: none;
    width: 18px;
    height: 18px;
    border: 2px solid var(--muted);
    border-radius: var(--radius-sm);
    background: transparent;
    position: relative;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.checkbox-label input[type="checkbox"]:checked {
    background: var(--accent-cyan);
    border-color: var(--accent-cyan);
}

.checkbox-label input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--bg-primary);
    font-size: 12px;
    font-weight: bold;
}

/* Toggle Styles */
.toggle-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.toggle-label:hover {
    background: rgba(255, 255, 255, 0.05);
}

.toggle-slider {
    position: relative;
    width: 42px;
    height: 24px;
    background: var(--muted);
    border-radius: 12px;
    transition: background-color var(--transition-fast);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform var(--transition-fast);
}

.toggle-label input[type="checkbox"] {
    appearance: none;
    opacity: 0;
    position: absolute;
}

.toggle-label input[type="checkbox"]:checked + .toggle-slider {
    background: var(--accent-cyan);
}

.toggle-label input[type="checkbox"]:checked + .toggle-slider::before {
    transform: translateX(18px);
}

/* ==========================================
   CARDS
   ========================================== */

.card {
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(34, 211, 238, 0.1);
}

/* ==========================================
   DEMO BANNER
   ========================================== */

.demo-banner {
    background: rgba(34, 211, 238, 0.1);
    border: 2px solid var(--accent-cyan);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    animation: fadeInDown 0.6s ease-out;
}

.demo-icon {
    font-size: var(--font-size-lg);
}

.demo-text {
    color: var(--accent-cyan);
}

/* ==========================================
   HERO SECTION
   ========================================== */

.hero {
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.hero-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--text-primary), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--muted);
    margin-bottom: var(--spacing-sm);
}

.hero-supporting {
    font-size: var(--font-size-base);
    color: var(--accent-cyan);
    font-weight: 500;
}

@media (min-width: 768px) {
    .hero-title {
        font-size: var(--font-size-4xl);
    }
}

/* ==========================================
   TODAY SNAPSHOT
   ========================================== */

.today-snapshot {
    text-align: center;
    position: relative;
    overflow: hidden;
}

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

.temp-display {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.temp-number {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    line-height: 1;
}

.temp-unit {
    font-size: var(--font-size-2xl);
    color: var(--muted);
}

.feels-like {
    font-size: var(--font-size-sm);
    color: var(--muted);
    margin-top: var(--spacing-xs);
    display: block;
}

.aqi-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.aqi-badge {
    background: var(--surface-dark);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    min-width: 80px;
}

.aqi-number {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    display: block;
}

.aqi-label {
    font-size: var(--font-size-xs);
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.aqi-description {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

@media (min-width: 768px) {
    .snapshot-main {
        grid-template-columns: 1fr 1fr;
    }
}

/* ==========================================
   PRIMARY BADGE
   ========================================== */

.primary-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.6s ease-out;
}

.primary-badge.safe {
    background: rgba(34, 197, 94, 0.2);
    color: var(--risk-safe);
    border: 2px solid var(--risk-safe);
}

.primary-badge.caution {
    background: rgba(245, 158, 11, 0.2);
    color: var(--risk-caution);
    border: 2px solid var(--risk-caution);
}

.primary-badge.high-risk {
    background: rgba(239, 68, 68, 0.2);
    color: var(--risk-high);
    border: 2px solid var(--risk-high);
}

.badge-icon {
    font-size: var(--font-size-xl);
}

.guidance {
    text-align: center;
}

.guidance p {
    font-size: var(--font-size-base);
    line-height: 1.6;
}

/* ==========================================
   ACTIVITY PREFERENCES
   ========================================== */

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

.sensitivity-toggles {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-xl);
}

.sensitivity-toggles h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

@media (min-width: 640px) {
    .activity-checkboxes {
        grid-template-columns: 1fr 1fr;
    }
}

@media (min-width: 1024px) {
    .activity-checkboxes {
        grid-template-columns: 1fr 1fr 1fr;
    }
}

/* ==========================================
   ACTIVITY GRID
   ========================================== */

.activity-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.activity-card {
    background: var(--surface-dark);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
}

.activity-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent-cyan);
}

.activity-icon {
    font-size: var(--font-size-2xl);
    width: 48px;
    text-align: center;
}

.activity-info {
    flex: 1;
}

.activity-name {
    font-weight: 600;
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-xs);
}

.activity-guidance {
    font-size: var(--font-size-sm);
    color: var(--muted);
}

.activity-risk {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.risk-badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.risk-badge.safe {
    background: rgba(34, 197, 94, 0.2);
    color: var(--risk-safe);
}

.risk-badge.caution {
    background: rgba(245, 158, 11, 0.2);
    color: var(--risk-caution);
}

.risk-badge.high-risk {
    background: rgba(239, 68, 68, 0.2);
    color: var(--risk-high);
}

@media (min-width: 768px) {
    .activity-grid {
        grid-template-columns: 1fr 1fr;
    }
}

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

/* ==========================================
   HOURLY RISK CHART
   ========================================== */

.hourly-container {
    background: var(--surface-dark);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
}

.hourly-chart {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xl);
    overflow-x: auto;
    padding-bottom: var(--spacing-sm);
}

.hour-item {
    flex: 0 0 40px;
    text-align: center;
}

.hour-time {
    font-size: var(--font-size-xs);
    color: var(--muted);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.hour-bar {
    width: 8px;
    background: var(--muted);
    border-radius: 4px;
    margin: 0 auto;
    position: relative;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.hour-bar:hover {
    transform: scale(1.1);
}

.hour-bar.safe {
    background: var(--risk-safe);
}

.hour-bar.caution {
    background: var(--risk-caution);
}

.hour-bar.high-risk {
    background: var(--risk-high);
}

.time-highlights {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.best-time h4 {
    color: var(--risk-safe);
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-xs);
}

.worst-time h4 {
    color: var(--risk-high);
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-xs);
}

/* ==========================================
   TOMORROW CARD
   ========================================== */

.tomorrow-card {
    background: linear-gradient(135deg, var(--surface-dark), var(--card-bg));
}

.tomorrow-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.tomorrow-temp {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.tomorrow-summary {
    color: var(--muted);
}

/* ==========================================
   NOTIFICATIONS
   ========================================== */

.notifications-card {
    text-align: center;
}

.notifications-card p {
    color: var(--muted);
    margin-bottom: var(--spacing-lg);
}

.notifications-status {
    margin-top: var(--spacing-md);
    font-size: var(--font-size-sm);
}

.notifications-status.enabled {
    color: var(--risk-safe);
}

.notifications-status.disabled {
    color: var(--muted);
}

/* ==========================================
   DISCLAIMER
   ========================================== */

.disclaimer-card {
    background: rgba(245, 158, 11, 0.1);
    border: 2px solid rgba(245, 158, 11, 0.3);
}

.disclaimer-content p {
    margin-bottom: var(--spacing-md);
}

.disclaimer-content ul {
    list-style: none;
    padding-left: 0;
}

.disclaimer-content li {
    padding: var(--spacing-xs) 0;
    color: var(--muted);
}

.disclaimer-content li::before {
    content: '✓';
    color: var(--risk-safe);
    font-weight: bold;
    margin-right: var(--spacing-sm);
}

/* ==========================================
   LOADING & ERROR STATES
   ========================================== */

.loading {
    text-align: center;
    padding: var(--spacing-2xl);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--muted);
    border-top: 3px solid var(--accent-cyan);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

.error {
    text-align: center;
    padding: var(--spacing-xl);
    background: rgba(239, 68, 68, 0.1);
    border: 2px solid var(--risk-red);
    border-radius: var(--radius-lg);
    color: var(--risk-red);
}

.error p {
    margin-bottom: var(--spacing-md);
}

/* ==========================================
   FOOTER
   ========================================== */

.footer {
    background: var(--surface-dark);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-2xl);
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
    color: var(--muted);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
}

.footer-links a {
    color: var(--muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--accent-cyan);
}

@media (min-width: 768px) {
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
    
    .footer-links {
        justify-content: flex-end;
    }
}

/* ==========================================
   ANIMATIONS
   ========================================== */

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes countUp {
    from {
        opacity: 0;
        transform: scale(0.5);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ==========================================
   RESPONSIVE UTILITIES
   ========================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --card-bg: #000000;
        --surface-dark: #000000;
        --text-primary: #ffffff;
    }
}

/* Print styles */
@media print {
    .header,
    .notifications-card,
    .footer {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}