/* ============================================
   Time Converter Pro - Main Stylesheet
   ============================================ */

/* CSS Variables */
:root {
    /* Brand Colors */
    --primary: #ff914d;
    --primary-dark: #ff711a;
    --primary-light: #fff6ed;
    --success: #12b981;
    --error: #ef4444;
    --text-primary: #1a1a1a;
    --text-secondary: #343a40;

    /* Neutral Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --border-color: #dee2e6;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Reset & Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--primary-light) 0%, #ffffff 50%, #fef3e7 100%);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Header */
.header {
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo span {
    color: var(--primary);
}

.nav {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    position: relative;
}

.nav-link:hover {
    color: var(--primary);
    background: var(--primary-light);
}

.nav-link.active {
    color: var(--primary);
    background: var(--primary-light);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 2px;
    background: var(--primary);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-2xl) 0;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.hero p {
    font-size: 1.125rem;
    opacity: 0.9;
}

/* Section */
.section {
    display: none;
    padding: var(--spacing-2xl) 0;
}

.section.active {
    display: block;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.section-header h3 {
    font-size: 2rem;
    color: var(--text-primary);
    font-weight: 700;
}

.section-header p {
    color: var(--text-secondary);
    margin-top: var(--spacing-sm);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    font-family: inherit;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

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

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

.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    color: var(--text-secondary);
    transition: all var(--transition-base);
    border-radius: var(--radius-sm);
}

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

.btn-swap {
    background: var(--primary);
    color: white;
    border: none;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.btn-swap:hover {
    background: var(--primary-dark);
    transform: rotate(180deg);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* Converter Grid */
.converter-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.swap-button-wrapper {
    display: flex;
    align-items: center;
}

/* Timezone Card */
.timezone-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.timezone-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.card-header h4 {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-weight: 600;
}

/* Timezone Select */
.timezone-select-wrapper {
    margin-bottom: var(--spacing-lg);
}

.timezone-search {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-base);
    font-family: inherit;
}

.timezone-search:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 145, 77, 0.1);
}

.timezone-select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: var(--bg-primary);
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: inherit;
}

.timezone-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 145, 77, 0.1);
}

/* Time Input - Modern Calendar Style */
.time-input-wrapper {
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.time-input {
    width: 100%;
    padding: 1rem 1.25rem;
    border: 3px solid var(--primary);
    border-radius: var(--radius-lg);
    font-size: 1.125rem;
    font-family: var(--font-mono);
    font-weight: 700;
    color: var(--text-primary);
    background: linear-gradient(135deg, #ffffff 0%, var(--primary-light) 100%);
    transition: all var(--transition-base);
    box-shadow: 0 4px 12px rgba(255, 145, 77, 0.15);
    cursor: pointer;
    position: relative;
}

.time-input:hover {
    border-color: var(--primary-dark);
    box-shadow: 0 6px 16px rgba(255, 145, 77, 0.25);
    transform: translateY(-2px);
}

.time-input:focus {
    outline: none;
    border-color: var(--primary-dark);
    box-shadow: 0 0 0 4px rgba(255, 145, 77, 0.2), 0 8px 20px rgba(255, 145, 77, 0.3);
    transform: scale(1.02);
}

/* Modern Calendar Picker Styling - Hide Icon, Make Entire Box Clickable */
.time-input::-webkit-calendar-picker-indicator {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.time-input::-webkit-datetime-edit-fields-wrapper {
    font-weight: 700;
}

.time-input::-webkit-datetime-edit {
    color: var(--primary-dark);
}

.time-input::-webkit-datetime-edit-year-field,
.time-input::-webkit-datetime-edit-month-field,
.time-input::-webkit-datetime-edit-day-field,
.time-input::-webkit-datetime-edit-hour-field,
.time-input::-webkit-datetime-edit-minute-field {
    color: var(--primary-dark);
    font-weight: 900;
    padding: 4px 6px;
    border-radius: 4px;
    background: rgba(255, 145, 77, 0.1);
}

.time-input::-webkit-datetime-edit-year-field:focus,
.time-input::-webkit-datetime-edit-month-field:focus,
.time-input::-webkit-datetime-edit-day-field:focus,
.time-input::-webkit-datetime-edit-hour-field:focus,
.time-input::-webkit-datetime-edit-minute-field:focus {
    background: var(--primary);
    color: white;
    outline: none;
}

/* Converted Time Display - Bold & Attractive */
.converted-time {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-dark);
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-light) 0%, #fff 50%, var(--primary-light) 100%);
    border: 4px solid var(--primary);
    border-radius: var(--radius-xl);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    letter-spacing: 0.5px;
    text-shadow: 1px 1px 2px rgba(255, 145, 77, 0.15);
    box-shadow:
        0 8px 24px rgba(255, 145, 77, 0.25),
        inset 0 -4px 8px rgba(255, 145, 77, 0.1);
    animation: pulseGlow 3s ease-in-out infinite;
    position: relative;
    overflow: hidden;
    line-height: 1.4;
}

.converted-time::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent,
        rgba(255, 145, 77, 0.1),
        transparent
    );
    transform: rotate(45deg);
    animation: shimmer 4s linear infinite;
}

@keyframes pulseGlow {
    0%, 100% {
        box-shadow:
            0 8px 24px rgba(255, 145, 77, 0.25),
            inset 0 -4px 8px rgba(255, 145, 77, 0.1);
    }
    50% {
        box-shadow:
            0 12px 32px rgba(255, 145, 77, 0.35),
            inset 0 -4px 12px rgba(255, 145, 77, 0.15);
    }
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%) translateY(-100%) rotate(45deg);
    }
    100% {
        transform: translateX(100%) translateY(100%) rotate(45deg);
    }
}

/* Timezone Info */
.timezone-info {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.offset {
    background: var(--bg-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.dst-badge {
    background: var(--success);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.dst-badge:empty {
    display: none;
}

/* Current Time */
.current-time {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-align: center;
}

/* Quick Actions */
.quick-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

/* Comparison Table */
.comparison-table {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.comparison-table h4 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

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

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

.comparison-table th {
    background: var(--primary);
    color: white;
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    position: sticky;
    top: 0;
}

.comparison-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.comparison-table tr:hover {
    background: var(--bg-secondary);
}

.comparison-table tr.business-hours {
    background: rgba(18, 185, 129, 0.1);
}

/* World Clock Section */
.clocks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.clock-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    position: relative;
    transition: all var(--transition-base);
}

.clock-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.clock-card .remove-btn {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--error);
    color: white;
    border: none;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition-base);
}

.clock-card:hover .remove-btn {
    opacity: 1;
}

.clock-city {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.clock-time {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    font-family: var(--font-mono);
    margin-bottom: var(--spacing-sm);
}

.clock-date {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.clock-timezone {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Meeting Scheduler */
.scheduler-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
}

.participants-panel,
.schedule-panel {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.participants-panel h4,
.schedule-panel h4 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.participants-list {
    margin-bottom: var(--spacing-lg);
}

.participant-item {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.participant-info h5 {
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.participant-info p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.working-hours-viz {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
}

.hours-grid {
    display: grid;
    grid-template-columns: repeat(24, 1fr);
    gap: 2px;
    margin-top: var(--spacing-md);
    min-width: 600px;
}

.hour-slot {
    aspect-ratio: 1;
    border-radius: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.625rem;
    color: var(--text-secondary);
}

.hour-slot.available {
    background: var(--success);
    color: white;
}

.hour-slot.partial {
    background: #fbbf24;
    color: white;
}

.hour-slot.unavailable {
    background: var(--bg-tertiary);
}

.suggested-times {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.time-suggestion {
    background: var(--primary-light);
    border: 2px solid var(--primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-base);
}

.time-suggestion:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.time-suggestion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.time-suggestion-time {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.availability-badge {
    background: var(--success);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.time-suggestion-details {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Favorites Section */
.favorites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.favorite-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    position: relative;
    transition: all var(--transition-base);
}

.favorite-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.favorite-card .remove-btn {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-secondary);
}

.empty-state svg {
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.empty-state p {
    margin-bottom: var(--spacing-sm);
}

.empty-state-hint {
    font-size: 0.875rem;
    opacity: 0.7;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease;
}

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

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

.modal-header h4 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.modal-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-xl);
}

.modal-footer {
    padding: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

/* Form Elements */
.form-input,
.form-select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    font-family: inherit;
    transition: all var(--transition-base);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 145, 77, 0.1);
}

.working-hours-inputs label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.time-range {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.time-range span {
    color: var(--text-secondary);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    transform: translateX(400px);
    transition: transform var(--transition-base);
    z-index: 3000;
    max-width: 300px;
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    background: var(--success);
}

.toast.error {
    background: var(--error);
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-2xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity var(--transition-base);
}

.footer-links a:hover {
    opacity: 1;
}

/* Responsive Design */
@media (max-width: 968px) {
    .converter-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .swap-button-wrapper {
        justify-content: center;
    }

    .btn-swap {
        transform: rotate(90deg);
    }

    .scheduler-grid {
        grid-template-columns: 1fr;
    }

    .nav {
        gap: var(--spacing-sm);
    }

    .nav-link {
        padding: var(--spacing-sm);
        font-size: 0.875rem;
    }
}

@media (max-width: 640px) {
    .hero h2 {
        font-size: 1.75rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .quick-actions {
        flex-direction: column;
    }

    .quick-actions .btn {
        width: 100%;
        justify-content: center;
    }

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

    .clocks-grid {
        grid-template-columns: 1fr;
    }

    .favorites-grid {
        grid-template-columns: 1fr;
    }
}

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

/* Focus Visible */
*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .nav,
    .btn,
    .modal {
        display: none !important;
    }

    .section {
        display: block !important;
    }
}