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

:root {
    /* Dark theme */
    --bg-primary: #0c0c1d;
    --bg-card: rgba(255, 255, 255, 0.04);
    --text-primary: #e8e8f0;
    --text-secondary: #b0b0c8;
    --text-dim: #707088;
    --accent-en: #e88aaf;
    --accent-ta: #7cc4e8;
    --accent-green: #5cc88a;
    --border: rgba(255, 255, 255, 0.08);
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.4);
    --progress-bg: rgba(255, 255, 255, 0.06);
}

body.light {
    --bg-primary: #f5f3f8;
    --bg-card: rgba(255, 255, 255, 0.8);
    --text-primary: #1c1c2e;
    --text-secondary: #4a4a62;
    --text-dim: #808098;
    --accent-en: #c04070;
    --accent-ta: #1a7aaa;
    --accent-green: #1a8a5a;
    --border: rgba(0, 0, 0, 0.06);
    --glass-bg: rgba(255, 255, 255, 0.6);
    --glass-border: rgba(0, 0, 0, 0.08);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.08);
    --progress-bg: rgba(0, 0, 0, 0.06);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background 0.5s ease, color 0.3s ease;
}

/* === Container === */
.container {
    width: min(90vw, 480px);
    margin: 0 auto;
    padding: clamp(1rem, 3vw, 2rem) clamp(0.75rem, 3vw, 1.5rem);
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* === Theme Toggle === */
.theme-toggle {
    position: absolute;
    top: clamp(1rem, 3vw, 1.5rem);
    right: clamp(0.75rem, 3vw, 1.5rem);
    width: clamp(36px, 8vw, 44px);
    height: clamp(36px, 8vw, 44px);
    border-radius: 50%;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(1rem, 3vw, 1.25rem);
    transition: all 0.3s ease;
    z-index: 10;
    box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
    transform: scale(1.08);
    border-color: var(--accent-ta);
}

.theme-toggle:active {
    transform: scale(0.95);
}

/* === Header === */
.header {
    text-align: center;
    margin-bottom: clamp(0.75rem, 3vw, 1.5rem);
    padding-top: 0.5rem;
}

.title-en {
    font-size: clamp(0.65rem, 2vw, 0.8rem);
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 0.15rem;
}

.title-ta {
    font-size: clamp(0.85rem, 2.5vw, 1.1rem);
    font-weight: 500;
    color: var(--text-secondary);
}

/* === Clock === */
.clock-section {
    text-align: center;
    margin-bottom: clamp(1rem, 4vw, 2rem);
}

.clock-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(0.4rem, 2vw, 0.85rem);
}

.clock {
    font-size: clamp(2.5rem, 10vw, 5rem);
    font-weight: 200;
    color: var(--text-primary);
    line-height: 1;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.04em;
}

.clock-tz {
    font-size: clamp(0.55rem, 1.5vw, 0.7rem);
    font-weight: 600;
    color: var(--text-dim);
    letter-spacing: 0.06em;
    background: var(--progress-bg);
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    align-self: flex-end;
    margin-bottom: 0.4rem;
}

/* === Day Progress === */
.day-progress {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    justify-content: center;
}

.day-progress-label {
    font-size: clamp(0.5rem, 1.5vw, 0.65rem);
    font-weight: 600;
    color: var(--text-dim);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    min-width: 2rem;
    text-align: right;
}

.day-progress-bar {
    width: clamp(80px, 25vw, 160px);
    height: 3px;
    border-radius: 3px;
    background: var(--progress-bg);
    overflow: hidden;
}

.day-progress-fill {
    height: 100%;
    border-radius: 3px;
    background: var(--accent-green);
    transition: width 1s linear;
}

.day-progress-pct {
    font-size: clamp(0.5rem, 1.5vw, 0.65rem);
    font-weight: 600;
    color: var(--text-dim);
    font-variant-numeric: tabular-nums;
    min-width: 2rem;
}

/* === Cards === */
.cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(0.6rem, 2vw, 1rem);
    flex: 1;
    align-items: start;
}

.card {
    border-radius: clamp(12px, 3vw, 18px);
    padding: clamp(1rem, 3vw, 1.5rem);
    border: 1px solid var(--glass-border);
    background: var(--bg-card);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

.card:hover {
    box-shadow: var(--shadow-md), 0 0 0 1px var(--glass-border);
}

/* === Card Label === */
.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: clamp(0.5rem, 2vw, 0.85rem);
}

.card-label {
    display: flex;
    align-items: center;
    gap: 0.45rem;
}

.card-lang {
    font-size: clamp(0.55rem, 1.5vw, 0.7rem);
    font-weight: 700;
    padding: 0.2rem 0.55rem;
    border-radius: 4px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.card-english .card-lang {
    background: var(--accent-en);
    color: #fff;
}

.card-tamil .card-lang {
    background: var(--accent-ta);
    color: #fff;
}

.card-system {
    font-size: clamp(0.5rem, 1.5vw, 0.65rem);
    color: var(--text-dim);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

/* === Card Date === */
.card-date {
    font-size: clamp(1.5rem, 5vw, 2.2rem);
    font-weight: 700;
    margin-bottom: clamp(0.4rem, 2vw, 0.7rem);
    line-height: 1.1;
    letter-spacing: -0.01em;
}

.card-english .card-date {
    color: var(--accent-en);
}

.card-tamil .card-date {
    color: var(--accent-ta);
}

/* === Card Details === */
.card-details {
    display: flex;
    gap: clamp(0.75rem, 3vw, 1.4rem);
    flex-wrap: wrap;
}

.card-detail {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.card-detail-label {
    font-size: clamp(0.45rem, 1.3vw, 0.6rem);
    font-weight: 600;
    color: var(--text-dim);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.card-detail-value {
    font-size: clamp(0.75rem, 2vw, 0.95rem);
    font-weight: 500;
    color: var(--text-secondary);
}

/* === Progress Bars === */
.progress-section {
    margin-top: clamp(0.5rem, 2vw, 0.8rem);
    padding-top: clamp(0.5rem, 2vw, 0.7rem);
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: clamp(0.35rem, 1.5vw, 0.55rem);
}

.progress-row {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

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

.progress-text {
    font-size: clamp(0.45rem, 1.3vw, 0.6rem);
    color: var(--text-dim);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.progress-pct {
    font-size: clamp(0.45rem, 1.3vw, 0.6rem);
    font-weight: 600;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}

.progress-bar {
    height: 3px;
    border-radius: 3px;
    background: var(--progress-bg);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.6s ease;
}

.card-english .progress-fill {
    background: var(--accent-en);
}

.card-tamil .progress-fill {
    background: var(--accent-ta);
}

.progress-fill-year {
    opacity: 0.45;
}

/* === Footer === */
.footer {
    text-align: center;
    padding-top: clamp(0.75rem, 3vw, 1.25rem);
    margin-top: auto;
}

.footer-note,
.footer-note-ta {
    font-size: clamp(0.5rem, 1.5vw, 0.65rem);
    color: var(--text-dim);
    line-height: 1.5;
}

.footer-note-ta {
    font-style: italic;
}

.footer-back {
    margin-top: 0.5rem;
}

.footer-back a {
    font-size: clamp(0.5rem, 1.5vw, 0.65rem);
    color: var(--accent-ta);
    text-decoration: none;
    opacity: 0.7;
    transition: opacity 0.2s;
}

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

/* === TABLET (481px – 768px) === */
@media (min-width: 481px) {
    .container {
        width: min(85vw, 560px);
    }
}

/* === DESKTOP (769px+) === */
@media (min-width: 769px) {
    .container {
        width: min(80vw, 720px);
    }

    /* Side-by-side cards on wide screens */
    .cards {
        grid-template-columns: 1fr 1fr;
        gap: clamp(0.75rem, 2vw, 1.25rem);
        align-items: start;
    }

    /* Slightly larger clock on desktop */
    .clock {
        font-size: clamp(3.5rem, 6vw, 5.5rem);
    }
}

/* === LARGE DESKTOP (1200px+) === */
@media (min-width: 1200px) {
    .container {
        width: min(75vw, 860px);
    }

    .card-date {
        font-size: clamp(1.8rem, 3vw, 2.5rem);
    }
}

/* === Animations === */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.card {
    animation: fadeInUp 0.5s ease forwards;
    opacity: 0;
}

.card:nth-child(1) { animation-delay: 0.1s; }
.card:nth-child(2) { animation-delay: 0.2s; }

.header {
    animation: fadeIn 0.6s ease forwards;
}

.clock-section {
    animation: fadeIn 0.8s ease 0.2s forwards;
    opacity: 0;
}

/* === Selection === */
::selection {
    background: var(--accent-ta);
    color: #fff;
}