:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --bg-card-hover: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: #334155;
    --danger: #ef4444;
    --success: #10b981;
    --shadow: 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, 0.2);
    --radius: 12px;
    --transition: all 0.25s ease;
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-card-hover: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Plus Jakarta Sans', sans-serif, system-ui;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Header */
.app-header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
}

.header-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.25rem;
    cursor: pointer;
}

.logo-icon {
    font-size: 1.5rem;
}

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

.nav-menu {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
    background-color: var(--bg-card-hover);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.icon-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.icon-btn:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--accent);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition);
}

/* Main Container */
.main-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    flex: 1;
    width: 100%;
}

/* Hero Section */
.hero-section {
    text-align: center;
    margin-bottom: 2.5rem;
}

.hero-title {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.hero-subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 1.5rem;
}

.nlp-search-wrapper {
    max-width: 700px;
    margin: 0 auto;
}

.search-input-container {
    background-color: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    padding: 0.5rem 0.75rem;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.search-input-container:focus-within {
    border-color: var(--accent);
}

.search-icon {
    font-size: 1.25rem;
    margin-right: 0.75rem;
}

.search-input-container input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    font-family: inherit;
}

.voice-btn, .search-submit-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    padding: 0.5rem;
    border-radius: 6px;
    transition: var(--transition);
    color: var(--text-secondary);
}

.voice-btn:hover {
    color: var(--accent);
}

.search-submit-btn {
    background-color: var(--accent);
    color: white;
    font-weight: 600;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    margin-left: 0.5rem;
}

.search-submit-btn:hover {
    background-color: var(--accent-hover);
}

.search-suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
    justify-content: center;
    margin-top: 1rem;
}

.suggestion-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.chip {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.3rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
}

.chip:hover {
    border-color: var(--accent);
    background-color: var(--bg-card-hover);
}

/* NLP Result Box */
.nlp-result-container {
    background-color: var(--bg-secondary);
    border: 1px solid var(--accent);
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-top: 1.5rem;
    text-align: left;
    box-shadow: var(--shadow-lg);
    animation: fadeIn 0.3s ease;
}

.nlp-result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: var(--accent);
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.recent-searches {
    margin-top: 1rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.75rem 1rem;
    text-align: left;
}

.recent-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.text-btn {
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font-size: 0.8rem;
}

.recent-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* Local Time Banner */
.local-time-banner {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
    box-shadow: var(--shadow);
}

.local-badge {
    background-color: rgba(59, 130, 246, 0.15);
    color: var(--accent);
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.local-banner-left h2 {
    font-size: 1.5rem;
    margin-top: 0.4rem;
}

.local-banner-left p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.local-banner-right {
    text-align: right;
}

.local-time-digits {
    font-family: 'JetBrains Mono', monospace;
    font-size: 2rem;
    font-weight: 700;
}

.local-date-digits {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Sections */
.app-section {
    display: none;
}

.app-section.active-section {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
}

/* World Clock Grid */
.world-clock-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.25rem;
}

.clock-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    position: relative;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.clock-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
    box-shadow: var(--shadow-lg);
}

.card-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.card-city-info h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.card-city-info p {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.favorite-btn {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

.favorite-btn.favorited, .favorite-btn:hover {
    color: #f59e0b;
}

.card-middle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 0.5rem 0;
}

.digital-time {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.75rem;
    font-weight: 700;
}

/* Analog Clock inside Card */
.analog-clock {
    width: 60px;
    height: 60px;
    border: 2px solid var(--border);
    border-radius: 50%;
    position: relative;
    background: var(--bg-primary);
}

.analog-clock .hand {
    position: absolute;
    bottom: 50%;
    left: 50%;
    transform-origin: bottom;
    background: var(--text-primary);
    border-radius: 2px;
}

.analog-clock .hour-hand {
    width: 3px;
    height: 16px;
    background: var(--text-primary);
}

.analog-clock .minute-hand {
    width: 2px;
    height: 22px;
    background: var(--text-secondary);
}

.analog-clock .second-hand {
    width: 1px;
    height: 24px;
    background: var(--danger);
}

.analog-clock .center-dot {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    transform: translate(-50%, -50%);
}

.card-bottom {
    border-top: 1px solid var(--border);
    padding-top: 0.75rem;
    margin-top: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.card-date {
    font-weight: 500;
}

/* Converter Section */
.converter-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1.5rem;
    align-items: center;
    box-shadow: var(--shadow-lg);
}

.converter-pane h3 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    color: var(--accent);
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

.styled-select, .styled-input, .styled-select-sm {
    width: 100%;
    background-color: var(--bg-primary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.75rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    outline: none;
    transition: var(--transition);
}

.styled-select:focus, .styled-input:focus {
    border-color: var(--accent);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.converter-swap-container {
    display: flex;
    align-items: center;
    justify-content: center;
}

.swap-btn {
    background-color: var(--bg-primary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.swap-btn:hover {
    background-color: var(--accent);
    border-color: var(--accent);
    color: white;
    transform: rotate(180deg);
}

.conversion-result-box {
    background-color: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
    margin-top: 1rem;
    text-align: center;
}

.result-time {
    font-family: 'JetBrains Mono', monospace;
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
}

.result-date, .result-offset {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.2rem;
}

.result-diff {
    display: inline-block;
    background-color: rgba(16, 185, 129, 0.15);
    color: var(--success);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-top: 0.75rem;
}

/* Compare Section */
.compare-controls {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.compare-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.compare-item-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    display: grid;
    grid-template-columns: 2fr 2fr 1fr auto;
    align-items: center;
    gap: 1rem;
}

.compare-time-digits {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.25rem;
    font-weight: 700;
}

/* Buttons */
.primary-btn, .secondary-btn {
    background-color: var(--accent);
    color: white;
    border: none;
    padding: 0.6rem 1.25rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

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

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

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

.danger-btn {
    background-color: rgba(239, 68, 68, 0.15);
    color: var(--danger);
    border: 1px solid var(--danger);
    padding: 0.4rem 0.75rem;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    font-size: 0.8rem;
    transition: var(--transition);
}

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

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal-overlay.hidden {
    display: none;
}

.modal-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    width: 100%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
    animation: scaleUp 0.25s ease;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    border-bottom: 1px solid var(--border);
}

.modal-body {
    padding: 1.25rem;
    max-height: 400px;
    overflow-y: auto;
}

.modal-city-list {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.modal-city-item {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
}

.modal-city-item:hover {
    border-color: var(--accent);
    background-color: var(--bg-card-hover);
}

/* Settings body items */
.settings-body {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.95rem;
}

.styled-select-sm {
    width: auto;
    padding: 0.4rem 0.75rem;
}

/* Switch */
.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: var(--border);
    transition: 0.3s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: 0.3s;
    border-radius: 50%;
}

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

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

/* Footer */
.app-footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border);
    margin-top: auto;
    padding: 2.5rem 1.5rem 1.5rem;
}

.footer-container {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-brand {
    max-width: 350px;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-links h4 {
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.footer-bottom {
    max-width: 1280px;
    margin: 0 auto;
    border-top: 1px solid var(--border);
    padding-top: 1.5rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.hidden {
    display: none !important;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleUp {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}