/* Turn text-rendering to optimizeLegibility for better font rendering */
/* Theme Variables & Reset */
:root {
    --bg-gradient-light: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --bg-gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);

    /* Light Theme Tokens - 3D */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --card-bg: linear-gradient(145deg, #ffffff, #e6e6e6);
    --card-border: 1px solid rgba(255, 255, 255, 0.4);
    /* 3D Drop Shadow: Deep distinct shadow + Light reflection for volume */
    --card-shadow: 20px 20px 60px #d1d9e6,
        -20px -20px 60px #ffffff;

    --accent-color: #3b82f6;
    --orb-1-color: #60a5fa;
    --orb-2-color: #a78bfa;

    /* Animation Speeds */
    --transition-speed: 0.3s;
}

body.dark-mode {
    /* Dark Theme Tokens - 3D */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --card-bg: linear-gradient(145deg, #1e293b, #111827);
    --card-border: 1px solid rgba(255, 255, 255, 0.05);
    /* 3D Dark Shadow */
    --card-shadow: 15px 15px 40px #0b0f19,
        -15px -15px 40px #25334d;
    --accent-color: #60a5fa;
    --orb-1-color: #2563eb;
    --orb-2-color: #7c3aed;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color var(--transition-speed), color var(--transition-speed), border-color var(--transition-speed);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--bg-gradient-light);
    color: var(--text-primary);
    overflow: hidden;
    /* Contain overflow from background elements */
    position: relative;
}

body.dark-mode {
    background: var(--bg-gradient-dark);
}

/* Ambient Background Effects */
.bg-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    z-index: 0;
    opacity: 0.6;
    animation: float 10s infinite ease-in-out alternate;
}

.orb-1 {
    width: 300px;
    height: 300px;
    background: var(--orb-1-color);
    top: -50px;
    left: -50px;
}

.orb-2 {
    width: 250px;
    height: 250px;
    background: var(--orb-2-color);
    bottom: -50px;
    right: -50px;
    animation-delay: -5s;
}

@keyframes float {
    0% {
        transform: translate(0, 0);
    }

    100% {
        transform: translate(30px, 50px);
    }
}

/* Application Container */
.app-container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 600px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Main Container - 3D Soft UI Effect */
.clock-card {
    background: var(--card-bg);
    border: var(--card-border);
    border-radius: 30px;
    /* Rounder for 3D feel */
    padding: 3rem 2rem;
    width: 100%;

    /* 3D Depth Shadows */
    box-shadow: var(--card-shadow);

    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;

    /* Entrance Animation */
    animation: fadeInUp 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
    opacity: 0;
    transform: translateY(20px);
    /* Start slightly lower */
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.clock-card:hover {
    transform: translateY(-5px);
}

/* Header & Badge */
.clock-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.badge {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--accent-color);
    background: rgba(59, 130, 246, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    border: 0.5px solid rgba(59, 130, 246, 0.2);
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.1);
    animation: pulse-glow 2s infinite ease-in-out;
}

@keyframes pulse-glow {
    0% {
        box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.2);
    }

    70% {
        box-shadow: 0 0 0 4px rgba(59, 130, 246, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(59, 130, 246, 0);
    }
}

/* Theme Toggle Button */
.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-primary);
    padding: 8px;
    border-radius: 50%;
    transition: background-color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    background: rgba(0, 0, 0, 0.05);
}

body.dark-mode .icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.hidden {
    display: none;
}

/* Time Display */
.time-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
    /* Flex parent for centering; suffix is absolutely positioned */
}

.time-display {
    font-family: 'ui-monospace', 'SFMono-Regular', 'SF Mono', 'Menlo', 'Consolas', 'Liberation Mono', monospace;
    font-size: 4.5rem;
    font-weight: 700;
    line-height: 1;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
    /* Ensure constant character width to prevent layout shifts during time updates */
    color: var(--text-primary);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.ampm {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-secondary);

    /* Remove from flow to maintain center alignment of main digits */
    position: absolute;
    left: 100%;
    bottom: 0.9rem;
    /* Optical alignment with digit baseline */
    margin-left: 0.75rem;
    white-space: nowrap;
}

/* Date Display */
.date-display {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    /* Premium label look */
    opacity: 0.8;
}

/* Controls Section */
.controls {
    margin-top: 1rem;
    width: 100%;
    display: flex;
    justify-content: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

body.dark-mode .controls {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.toggle-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.toggle-label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
}

/* Toggle Component */
.toggle-switch {
    width: 50px;
    height: 28px;
    background: #cbd5e1;
    border-radius: 999px;
    border: none;
    position: relative;
    cursor: pointer;
    transition: background-color 0.3s;
    padding: 0;
}

.toggle-handle {
    width: 24px;
    height: 24px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 2px;
    transition: transform 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.toggle-switch[aria-pressed="true"] {
    background: var(--accent-color);
}

.toggle-switch[aria-pressed="true"] .toggle-handle {
    transform: translateX(22px);
}

/* Footer */
.app-footer {
    margin-top: 2rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 480px) {
    .clock-card {
        padding: 2rem 1.5rem;
    }

    .time-display {
        font-size: 3rem;
    }

    .ampm {
        font-size: 1rem;
        bottom: 0.6rem;
        /* Adjust baseline for smaller font */
    }

    .orb-1,
    .orb-2 {
        width: 200px;
        height: 200px;
    }
}