/* ==========================================================================
   Time Zone Meeting Planner - Cyan Theme
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
    /* Colors - Cyan Theme */
    --color-bg: #030712;
    --color-bg-elevated: #0a1628;
    --color-bg-card: rgba(6, 22, 38, 0.8);

    --color-primary: #06b6d4;
    --color-primary-glow: rgba(6, 182, 212, 0.4);
    --color-primary-dark: #0891b2;
    --color-accent: #22d3ee;
    --color-accent-glow: rgba(34, 211, 238, 0.3);

    --color-success: #10b981;
    --color-success-glow: rgba(16, 185, 129, 0.3);
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-overlap: #06b6d4;

    --color-working-hours: rgba(16, 185, 129, 0.4);
    --color-working-hours-border: rgba(16, 185, 129, 0.6);
    --color-overlap-highlight: rgba(6, 182, 212, 0.6);

    --color-text: #f0f9ff;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;

    --color-border: rgba(6, 182, 212, 0.1);
    --color-border-hover: rgba(6, 182, 212, 0.3);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

/* --------------------------------------------------------------------------
   Animated Background
   -------------------------------------------------------------------------- */
.bg-animation {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.bg-gradient {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(6, 182, 212, 0.2), transparent),
        radial-gradient(ellipse 60% 40% at 80% 80%, rgba(34, 211, 238, 0.1), transparent);
}

.bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(6, 182, 212, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(6, 182, 212, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black, transparent);
}

.bg-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.35;
    animation: float 25s ease-in-out infinite;
}

.bg-glow--1 {
    width: 500px;
    height: 500px;
    background: var(--color-primary);
    top: -150px;
    right: -100px;
}

.bg-glow--2 {
    width: 400px;
    height: 400px;
    background: var(--color-accent);
    bottom: -100px;
    left: -100px;
    animation-delay: -12s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(20px, -20px) scale(1.03); }
    66% { transform: translate(-15px, 15px) scale(0.97); }
}

/* --------------------------------------------------------------------------
   Container
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    padding-top: 80px;
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(3, 7, 18, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.site-nav__brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--color-text);
}

.site-nav__icon {
    font-size: 1.25rem;
    color: var(--color-primary);
}

.site-nav__text {
    font-size: 1.1rem;
    font-weight: 700;
}

.site-nav__accent {
    color: var(--color-accent);
}

.site-nav__share {
    display: flex;
    gap: var(--spacing-sm);
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.header {
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.header__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

.header__badge-icon {
    font-size: 1rem;
}

.header__title {
    font-size: clamp(2rem, 6vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
}

.text-gradient {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header__tagline {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    white-space: nowrap;
}

.btn--primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
    box-shadow: 0 0 30px var(--color-primary-glow);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 50px var(--color-primary-glow);
}

.btn--primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

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

.btn--secondary:hover {
    border-color: var(--color-border-hover);
    background: rgba(255, 255, 255, 0.05);
}

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

.btn--ghost:hover {
    color: var(--color-text);
    border-color: var(--color-border-hover);
}

.btn--small {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.8125rem;
}

.btn--danger {
    background: transparent;
    color: var(--color-danger);
    border: 1px solid transparent;
    padding: var(--spacing-xs);
}

.btn--danger:hover {
    background: rgba(239, 68, 68, 0.1);
}

/* --------------------------------------------------------------------------
   Current Time Card
   -------------------------------------------------------------------------- */
.current-time-card {
    text-align: center;
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.15) 0%, rgba(34, 211, 238, 0.1) 100%);
    border: 1px solid rgba(6, 182, 212, 0.3);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(10px);
    margin-bottom: var(--spacing-lg);
}

.current-time__label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-xs);
}

.current-time__value {
    font-family: var(--font-mono);
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
    text-shadow: 0 0 30px var(--color-primary-glow);
}

.current-time__zone {
    font-size: 1rem;
    color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   Add Zone Card
   -------------------------------------------------------------------------- */
.add-zone-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    backdrop-filter: blur(10px);
    margin-bottom: var(--spacing-lg);
}

.section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.section-title svg {
    color: var(--color-primary);
}

.add-zone-controls {
    display: flex;
    gap: var(--spacing-md);
}

@media (max-width: 600px) {
    .add-zone-controls {
        flex-direction: column;
    }
}

.select-wrapper {
    flex: 1;
    position: relative;
}

.form-select {
    width: 100%;
    padding: var(--spacing-md);
    padding-right: var(--spacing-2xl);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 1rem;
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition-fast);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px;
}

.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.form-select option {
    background: var(--color-bg-elevated);
    color: var(--color-text);
}

.form-select optgroup {
    font-weight: 600;
    color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Zones Section
   -------------------------------------------------------------------------- */
.zones-section {
    margin-bottom: var(--spacing-lg);
}

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

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

/* Zone Card */
.zone-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    transition: all var(--transition-fast);
}

.zone-card:hover {
    border-color: var(--color-border-hover);
}

.zone-card__time {
    flex-shrink: 0;
    min-width: 120px;
    text-align: center;
}

.zone-card__time-value {
    font-family: var(--font-mono);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1;
}

.zone-card__time-value.is-working {
    color: var(--color-success);
}

.zone-card__time-value.is-night {
    color: var(--color-text-muted);
}

.zone-card__date {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

.zone-card__info {
    flex: 1;
}

.zone-card__name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

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

.zone-card__status {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
    margin-left: var(--spacing-sm);
}

.zone-card__status--working {
    background: rgba(16, 185, 129, 0.15);
    color: var(--color-success);
}

.zone-card__status--outside {
    background: rgba(100, 116, 139, 0.15);
    color: var(--color-text-muted);
}

.zone-card__remove {
    flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Timeline Section
   -------------------------------------------------------------------------- */
.timeline-section {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    backdrop-filter: blur(10px);
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
}

.timeline-hint {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

.timeline-container {
    min-width: 700px;
}

/* Timeline Header */
.timeline-header {
    display: flex;
    margin-bottom: var(--spacing-sm);
    padding-left: 140px;
}

.timeline-hour {
    flex: 1;
    text-align: center;
    font-size: 0.6875rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

/* Timeline Row */
.timeline-row {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.timeline-row:last-child {
    margin-bottom: 0;
}

.timeline-row__label {
    width: 140px;
    flex-shrink: 0;
    padding-right: var(--spacing-md);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.timeline-row__bar {
    flex: 1;
    display: flex;
    height: 32px;
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.timeline-hour-block {
    flex: 1;
    border-right: 1px solid rgba(255, 255, 255, 0.03);
    transition: background var(--transition-fast);
}

.timeline-hour-block:last-child {
    border-right: none;
}

.timeline-hour-block.is-working {
    background: var(--color-working-hours);
}

.timeline-hour-block.is-overlap {
    background: var(--color-overlap-highlight);
    box-shadow: inset 0 0 10px rgba(6, 182, 212, 0.3);
}

.timeline-hour-block.is-current {
    position: relative;
}

.timeline-hour-block.is-current::after {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    width: 2px;
    height: 100%;
    background: var(--color-danger);
    transform: translateX(-50%);
}

/* --------------------------------------------------------------------------
   Best Times Section
   -------------------------------------------------------------------------- */
.best-times-section {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    backdrop-filter: blur(10px);
    margin-bottom: var(--spacing-lg);
}

.best-times-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.best-time-card {
    padding: var(--spacing-md);
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: var(--radius-md);
    text-align: center;
}

.best-time-card__hour {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.best-time-card__label {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
}

.best-time-card--highlight {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.2) 0%, rgba(34, 211, 238, 0.15) 100%);
    border-color: rgba(6, 182, 212, 0.4);
}

.best-time-card--highlight .best-time-card__hour {
    color: var(--color-accent);
}

.no-overlap-msg {
    text-align: center;
    color: var(--color-warning);
    padding: var(--spacing-lg);
    background: rgba(245, 158, 11, 0.1);
    border-radius: var(--radius-md);
}

/* --------------------------------------------------------------------------
   Share Section
   -------------------------------------------------------------------------- */
.share-section {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    backdrop-filter: blur(10px);
    margin-bottom: var(--spacing-lg);
}

.share-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    text-decoration: none;
}

.share-btn--copy {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
}

.share-btn--copy:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px var(--color-primary-glow);
}

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

.share-btn--text:hover {
    border-color: var(--color-border-hover);
}

/* --------------------------------------------------------------------------
   Toast
   -------------------------------------------------------------------------- */
.toast {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: 0.9375rem;
    animation: toastIn 0.3s ease;
    z-index: 1001;
    box-shadow: 0 0 30px var(--color-primary-glow);
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
    padding: var(--spacing-2xl) 0;
    text-align: center;
}

.footer__credit {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.footer__credit a {
    color: var(--color-primary);
    text-decoration: none;
}

.footer__credit a:hover {
    text-decoration: underline;
}

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

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Utility
   -------------------------------------------------------------------------- */
[hidden] {
    display: none !important;
}

/* --------------------------------------------------------------------------
   Scrollbar Styling
   -------------------------------------------------------------------------- */
.timeline-section::-webkit-scrollbar {
    height: 8px;
}

.timeline-section::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.02);
    border-radius: 4px;
}

.timeline-section::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: 4px;
}

.timeline-section::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Animation for zone cards
   -------------------------------------------------------------------------- */
.zone-card {
    animation: fadeSlideIn 0.3s ease;
}

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