/*
 * Swiss International Typographic Style
 * UK Daylight Saving Time Countdown
 *
 * Design Principles Applied:
 * - Mathematical grid system (8px base unit)
 * - Asymmetric balance with strong left alignment
 * - Limited color: black, white, Swiss red accent
 * - Objective typography hierarchy
 * - Generous whitespace
 */

/* ==========================================
   CSS Custom Properties (Design Tokens)
   ========================================== */
:root {
    /* Swiss Color Palette */
    --color-black: #0a0a0a;
    --color-white: #fafafa;
    --color-swiss-red: #da291c;  /* Official Swiss flag red */
    --color-gray-dark: #404040;
    --color-gray-mid: #808080;
    --color-gray-light: #d0d0d0;

    /* Typography Scale (based on 1.333 - Perfect Fourth) */
    --font-display: 'Archivo', 'Helvetica Neue', Helvetica, sans-serif;
    --font-numbers: 'Archivo', 'Helvetica Neue', Helvetica, sans-serif;

    --text-xs: 0.75rem;      /* 12px */
    --text-sm: 0.875rem;     /* 14px */
    --text-base: 1rem;       /* 16px */
    --text-lg: 1.333rem;     /* 21px */
    --text-xl: 1.777rem;     /* 28px */
    --text-2xl: 2.369rem;    /* 38px */
    --text-3xl: 3.157rem;    /* 50px */
    --text-4xl: 4.209rem;    /* 67px */
    --text-hero: clamp(4rem, 10vw, 7rem);

    /* Spacing Scale (8px base unit - Swiss grid) */
    --space-1: 0.5rem;       /* 8px */
    --space-2: 1rem;         /* 16px */
    --space-3: 1.5rem;       /* 24px */
    --space-4: 2rem;         /* 32px */
    --space-5: 3rem;         /* 48px */
    --space-6: 4rem;         /* 64px */
    --space-7: 6rem;         /* 96px */
    --space-8: 8rem;         /* 128px */

    /* Layout */
    --max-width: 1400px;
    --grid-gutter: var(--space-4);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE/Edge */
}

html::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

body {
    font-family: var(--font-display);
    font-weight: 400;
    background-color: var(--color-white);
    color: var(--color-black);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ==========================================
   Container & Grid System
   ========================================== */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-5) var(--space-4) var(--space-7);
    display: grid;
    grid-template-rows: auto 1fr auto;
    min-height: 100vh;
}

/* ==========================================
   Header - Swiss Asymmetric Layout
   ========================================== */
header {
    margin-bottom: var(--space-7);
    padding-left: var(--space-1);
    border-left: 4px solid var(--color-black);
}

.header-meta {
    margin-bottom: var(--space-2);
}

.meta-label {
    font-size: var(--text-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--color-gray-mid);
}

h1 {
    font-family: var(--font-display);
    font-size: clamp(var(--text-3xl), 8vw, var(--text-4xl));
    font-weight: 900;
    letter-spacing: -0.03em;
    line-height: 0.95;
    text-transform: uppercase;
    margin-bottom: var(--space-3);
}

.description {
    font-size: var(--text-sm);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-gray-dark);
}

/* ==========================================
   Main Content - Two Column Swiss Grid
   ========================================== */
main {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: var(--space-6);
    align-items: start;
}

/* ==========================================
   Countdown Section
   ========================================== */
.countdown-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.countdown-wrapper {
    position: relative;
}

.countdown {
    font-family: var(--font-numbers);
    font-size: var(--text-hero);
    font-weight: 900;
    letter-spacing: -0.02em;
    line-height: 1;
    color: var(--color-swiss-red);
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum" 1;

    /* Prevent layout shift with fixed-width characters */
    white-space: nowrap;
    overflow: hidden;
}

.countdown.hidden {
    display: none;
}

/* Full Countdown Display - Stacked Units */
.countdown-full {
    display: none;
    flex-wrap: wrap;
    gap: var(--space-4) var(--space-5);
}

.countdown-full.active {
    display: flex;
}

.time-unit {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    min-width: 80px;
}

.time-value {
    font-family: var(--font-numbers);
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 900;
    line-height: 1;
    color: var(--color-swiss-red);
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum" 1;
}

.time-label {
    font-size: var(--text-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-gray-mid);
    margin-top: var(--space-1);
}

.countdown-label {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    margin-top: var(--space-2);
    padding-left: 4px;
}

.countdown-full.active + .countdown-label {
    display: none;
}

.unit {
    font-size: var(--text-lg);
    font-weight: 700;
    text-transform: lowercase;
    letter-spacing: 0.02em;
    color: var(--color-black);
}

.unit-detail {
    font-size: var(--text-sm);
    font-weight: 400;
    color: var(--color-gray-mid);
    letter-spacing: 0.05em;
}

/* ==========================================
   Progress Bar - Swiss Precision
   ========================================== */
.progress-container {
    width: 100%;
}

.progress-track {
    width: 100%;
    height: 3px;
    background-color: var(--color-gray-light);
    position: relative;
}

.progress-bar {
    height: 100%;
    background-color: var(--color-swiss-red);
    width: 0%;
    transition: width 0.3s ease-out;
}

.track-tick {
    position: absolute;
    top: 0;
    width: 1px;
    height: 10px;
    background-color: var(--color-gray-light);
}

.track-tick-start {
    left: 0;
}

.track-tick-end {
    right: 0;
}

.solstice-marker {
    position: absolute;
    top: 0;
    transform: translateX(-50%);
    display: none;
    flex-direction: column;
    align-items: center;
}

.solstice-marker.visible {
    display: flex;
}

.solstice-tick {
    width: 1px;
    height: 10px;
    background-color: var(--color-gray-mid);
}

.solstice-label {
    font-size: 0.625rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-gray-mid);
    margin-top: 2px;
    white-space: nowrap;
}

.progress-labels {
    display: flex;
    justify-content: space-between;
    margin-top: var(--space-1);
    font-size: var(--text-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-gray-mid);
}

/* ==========================================
   Info Section - Right Sidebar
   ========================================== */
.info-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    padding-left: var(--space-4);
    border-left: 1px solid var(--color-black);
}

.info-block {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.label {
    font-size: var(--text-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--color-gray-mid);
}

.value {
    font-size: var(--text-base);
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--color-black);
}

.source-link {
    color: var(--color-black);
    text-decoration: none;
    display: inline-block;
    position: relative;
}

.source-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--color-black);
    transform: scaleX(1);
    transform-origin: left;
    transition: transform 0.2s ease;
}

.source-link:hover::after {
    transform: scaleX(0);
    transform-origin: right;
}

/* ==========================================
   Footer - Minimal Swiss Style
   ========================================== */
footer {
    margin-top: var(--space-7);
    padding-top: var(--space-4);
    padding-bottom: var(--space-6);
}

.footer-content {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-wrap: wrap;
    font-size: var(--text-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-gray-mid);
}

.footer-content a {
    color: var(--color-gray-mid);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-content a:hover {
    color: var(--color-black);
}

.social-share {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: 1px solid var(--color-gray-light);
    transition: all 0.2s ease;
}

.social-icon:hover {
    border-color: var(--color-black);
    color: var(--color-black);
}

.footer-sep {
    color: var(--color-gray-light);
}

/* ==========================================
   Error State
   ========================================== */
.error {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-swiss-red);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    z-index: 1000;
}

.error p {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 700;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    line-height: 1.4;
}

.error.hidden {
    display: none;
}

/* ==========================================
   Settings Toggle Button
   ========================================== */
.settings-toggle {
    position: fixed;
    top: var(--space-4);
    right: var(--space-4);
    width: 44px;
    height: 44px;
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-light);
    border-radius: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-gray-mid);
    transition: all 0.2s ease;
    z-index: 100;
}

.settings-toggle:hover {
    color: var(--color-black);
    border-color: var(--color-black);
}

/* ==========================================
   Settings Panel - Swiss Slide-out
   ========================================== */
.settings-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(10, 10, 10, 0.3);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 200;
}

.settings-overlay.active {
    opacity: 1;
    visibility: visible;
}

.settings-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 320px;
    max-width: 100%;
    height: 100%;
    background-color: var(--color-white);
    border-left: 1px solid var(--color-black);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 300;
    display: flex;
    flex-direction: column;
}

.settings-panel.active {
    transform: translateX(0);
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-gray-light);
}

.settings-title {
    font-size: var(--text-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.2em;
}

.settings-close {
    width: 32px;
    height: 32px;
    background: none;
    border: 1px solid var(--color-gray-light);
    cursor: pointer;
    font-size: 1.25rem;
    color: var(--color-gray-mid);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.settings-close:hover {
    color: var(--color-black);
    border-color: var(--color-black);
}

.settings-content {
    padding: var(--space-4);
    flex: 1;
    overflow-y: auto;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-gray-light);
}

.setting-item:last-child {
    border-bottom: none;
}

.setting-label {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-black);
}

/* Toggle Switch */
.toggle {
    width: 48px;
    height: 24px;
    background-color: var(--color-gray-light);
    border: none;
    border-radius: 0;
    cursor: pointer;
    position: relative;
    transition: background-color 0.2s ease;
}

.toggle[aria-checked="true"] {
    background-color: var(--color-swiss-red);
}

.toggle-slider {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background-color: var(--color-white);
    transition: transform 0.2s ease;
}

.toggle[aria-checked="true"] .toggle-slider {
    transform: translateX(24px);
}

/* Format Buttons */
.setting-options {
    display: flex;
    gap: 0;
}

.format-btn {
    padding: var(--space-1) var(--space-2);
    font-family: var(--font-display);
    font-size: var(--text-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-light);
    color: var(--color-gray-mid);
    cursor: pointer;
    transition: all 0.2s ease;
}

.format-btn:first-child {
    border-right: none;
}

.format-btn:hover {
    color: var(--color-black);
    border-color: var(--color-black);
}

.format-btn.active,
.mood-btn.active {
    background-color: var(--color-black);
    border-color: var(--color-black);
    color: var(--color-white);
}

/* Mood Buttons - same style as format buttons */
.mood-btn {
    padding: var(--space-1) var(--space-2);
    font-family: var(--font-display);
    font-size: var(--text-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-light);
    color: var(--color-gray-mid);
    cursor: pointer;
    transition: all 0.2s ease;
}

.mood-btn:first-child {
    border-right: none;
}

.mood-btn:hover {
    color: var(--color-black);
    border-color: var(--color-black);
}

/* Custom Country Dropdown */
.country-dropdown {
    position: relative;
    min-width: 160px;
}

.country-dropdown-trigger {
    display: flex;
    align-items: center;
    gap: 0.5em;
    width: 100%;
    padding: var(--space-1) var(--space-2);
    font-family: var(--font-display);
    font-size: var(--text-xs);
    font-weight: 500;
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-light);
    color: var(--color-black);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.country-dropdown-trigger:hover {
    border-color: var(--color-black);
}

.country-dropdown-trigger:focus {
    outline: none;
    border-color: var(--color-black);
}

.country-dropdown-flag {
    flex-shrink: 0;
    line-height: 1;
}

.country-dropdown-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.country-dropdown-arrow {
    flex-shrink: 0;
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid var(--color-gray-mid);
    transition: transform 0.2s ease;
}

.country-dropdown.open .country-dropdown-arrow {
    transform: rotate(180deg);
}

.country-dropdown-menu {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    max-height: 280px;
    overflow-y: auto;
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-light);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    display: none;
}

.country-dropdown.open .country-dropdown-menu {
    display: block;
}

.country-dropdown-group {
    padding: var(--space-1) 0;
}

.country-dropdown-group:not(:last-child) {
    border-bottom: 1px solid var(--color-gray-light);
}

.country-dropdown-group-label {
    padding: var(--space-1) var(--space-2);
    font-size: 10px;
    font-weight: 700;
    color: var(--color-gray-mid);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.country-dropdown-option {
    display: flex;
    align-items: center;
    gap: 0.5em;
    width: 100%;
    padding: var(--space-1) var(--space-2);
    font-family: var(--font-display);
    font-size: var(--text-xs);
    font-weight: 500;
    background: none;
    border: none;
    color: var(--color-black);
    cursor: pointer;
    text-align: left;
    transition: background-color 0.15s ease;
}

.country-dropdown-option:hover,
.country-dropdown-option:focus {
    background-color: var(--color-gray-light);
    outline: none;
}

.country-dropdown-option.selected {
    background-color: var(--color-gray-light);
}

.country-dropdown-option-flag {
    flex-shrink: 0;
    line-height: 1;
}

.country-dropdown-option-text {
    flex: 1;
}

/* Twemoji flag images for cross-platform rendering */
.country-dropdown img.emoji {
    height: 1.2em;
    width: 1.2em;
    vertical-align: -0.2em;
}

/* ==========================================
   Dark Mode Theme
   ========================================== */
[data-theme="dark"] {
    --color-black: #fafafa;
    --color-white: #0a0a0a;
    --color-gray-dark: #c0c0c0;
    --color-gray-mid: #808080;
    --color-gray-light: #303030;
}

[data-theme="dark"] .settings-toggle {
    background-color: var(--color-white);
}

[data-theme="dark"] .settings-panel {
    background-color: #0a0a0a;
}

[data-theme="dark"] .format-btn.active {
    background-color: var(--color-black);
    color: #0a0a0a;
}

[data-theme="dark"] .toggle-slider {
    background-color: #0a0a0a;
}

[data-theme="dark"] .toggle[aria-checked="true"] .toggle-slider {
    background-color: var(--color-white);
}

[data-theme="dark"] .footer-text a:hover {
    color: var(--color-black);
}

[data-theme="dark"] .country-dropdown-trigger,
[data-theme="dark"] .country-dropdown-menu {
    background-color: #0a0a0a;
}

[data-theme="dark"] .country-dropdown-option:hover,
[data-theme="dark"] .country-dropdown-option:focus,
[data-theme="dark"] .country-dropdown-option.selected {
    background-color: #1a1a1a;
}

/* ==========================================
   Responsive Design - Mobile First
   ========================================== */
@media (max-width: 900px) {
    main {
        grid-template-columns: 1fr;
        gap: var(--space-5);
    }

    .info-section {
        flex-direction: row;
        flex-wrap: wrap;
        gap: var(--space-4);
        padding-left: 0;
        padding-top: var(--space-4);
        border-left: none;
        border-top: 1px solid var(--color-black);
    }

    .info-block {
        flex: 1;
        min-width: 120px;
    }
}

@media (max-width: 600px) {
    :root {
        --text-hero: clamp(2.5rem, 15vw, 4rem);
    }

    html {
        overflow: visible;
        overflow-x: hidden;
    }

    .container {
        padding: var(--space-3) var(--space-2);
        min-height: 100vh;
        min-height: 100dvh; /* Dynamic viewport height for mobile browsers */
    }

    header {
        margin-bottom: var(--space-4);
    }

    h1 {
        font-size: clamp(var(--text-2xl), 10vw, var(--text-3xl));
    }

    .countdown {
        font-size: min(11vw, 2.5rem);
    }

    .countdown-section {
        gap: var(--space-4);
    }

    .progress-labels {
        font-size: 0.625rem;
    }

    .info-section {
        flex-direction: column;
        gap: var(--space-3);
        border-top: none;
        padding-top: 0;
    }

    .info-block {
        min-width: 100%;
    }

    footer {
        margin-top: var(--space-4);
        padding-bottom: var(--space-2);
    }

    .settings-toggle {
        top: var(--space-2);
        right: var(--space-2);
        width: 40px;
        height: 40px;
    }
}

/* ==========================================
   Print Styles
   ========================================== */
@media print {
    body {
        background: white;
        color: black;
    }

    .countdown {
        color: black;
    }

    .progress-container,
    .error {
        display: none;
    }
}