:root {
    /* Dark Theme (Default) */
    --body-bg: #0f172a;
    --bg-blur: blur(25px);
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
    --text-color: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent-color: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.4);
    --weekend-color: #fb7185;
    --today-bg: rgba(56, 189, 248, 0.2);
    --card-bg: rgba(30, 41, 59, 0.4);
}

[data-theme="light"] {
    /* Light Theme - High Contrast */
    --body-bg: #f8fafc;
    --bg-blur: blur(15px);
    --glass-bg: rgba(255, 255, 255, 0.85);
    /* More opaque white */
    --glass-border: rgba(0, 0, 0, 0.1);
    --glass-shadow: 0 4px 20px 0 rgba(0, 0, 0, 0.1);
    --text-color: #0f172a;
    /* Near-black text */
    --text-secondary: #475569;
    --accent-color: #0284c7;
    --accent-glow: rgba(2, 132, 199, 0.2);
    --weekend-color: #e11d48;
    --today-bg: rgba(2, 132, 199, 0.15);
    --card-bg: rgba(255, 255, 255, 0.5);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.4s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Cherry Blossom Background */
.petals-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    /* Bring to front but pointer-events: none allows clicking things behind */
    overflow: hidden;
}

.petal {
    position: absolute;
    background: linear-gradient(135deg, #ffb7c5 0%, #ff99aa 100%);
    border-radius: 90% 0 90% 50%;
    opacity: 0.6;
    animation: fall linear infinite;
    box-shadow: 0 0 8px rgba(255, 183, 197, 0.4);
}

@keyframes fall {
    0% {
        transform: translate(0, -50px) rotate(0deg) scale(0.6);
        opacity: 0;
    }

    15% {
        opacity: 0.8;
    }

    85% {
        opacity: 0.8;
    }

    100% {
        transform: translate(300px, 105vh) rotate(1080deg) scale(1.1);
        opacity: 0;
    }
}

html {
    background-color: var(--body-bg);
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-color);
    background-color: var(--body-bg);
    min-height: 100vh;
    overflow-x: hidden;
    font-weight: 500;
    /* Bolder base font */
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Glass Header */
.glass-header {
    background: var(--glass-bg);
    backdrop-filter: var(--bg-blur);
    -webkit-backdrop-filter: var(--bg-blur);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    /* Changed to column for centering desktop title */
    align-items: center;
    gap: 1.5rem;
    box-shadow: var(--glass-shadow);
    margin-bottom: 2rem;
    animation: fadeInDown 0.8s ease-out;
}

.header-left h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    background: linear-gradient(135deg, var(--text-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-align: center;
    filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.3));
}

.header-right {
    display: flex;
    gap: 1rem;
    align-items: center;
    justify-content: center;
    width: 100%;
    flex-wrap: wrap;
}

.year-selector-container {
    display: flex;
    align-items: center;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 50px;
    padding: 2px;
    border: 1px solid var(--glass-border);
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.2);
    position: relative;
    overflow: hidden;
}

[data-theme="light"] .year-selector-container {
    background: rgba(0, 0, 0, 0.05);
    box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.05);
}

.year-display-wrapper {
    width: 90px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    perspective: 1000px;
}

.year-display-wrapper::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom,
            rgba(0, 0, 0, 0.2) 0%,
            transparent 20%,
            transparent 80%,
            rgba(0, 0, 0, 0.2) 100%);
    pointer-events: none;
    z-index: 2;
}

.year-selector-container input {
    background: transparent;
    border: none;
    color: var(--accent-color);
    font-size: 1.4rem;
    font-weight: 800;
    width: 100%;
    text-align: center;
    outline: none;
    transform: translateZ(10px);
    text-shadow: 0 0 10px var(--accent-glow);
}

.year-nav-btn {
    background: var(--glass-bg);
    border: none;
    color: var(--text-color);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all 0.2s;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.year-nav-btn:hover {
    background: var(--accent-color);
    color: white;
    transform: scale(1.1);
}

.glass-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-color);
    padding: 0.6rem 1.2rem;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    font-weight: 600;
}

.glass-btn:hover {
    background: var(--glass-border);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--accent-glow);
}

/* Floating Action Buttons */
.floating-controls {
    position: fixed;
    bottom: 30px;
    right: 30px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    z-index: 2000; /* Above everything including modal */
}

.fab-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--glass-bg);
    backdrop-filter: var(--bg-blur);
    -webkit-backdrop-filter: var(--bg-blur);
    border: 1px solid var(--glass-border);
    color: var(--text-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--glass-shadow);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}

.fab-btn .text {
    position: absolute;
    right: 70px;
    background: var(--glass-bg);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    transform: translateX(20px);
    transition: all 0.3s ease;
    pointer-events: none;
    border: 1px solid var(--glass-border);
}

.fab-btn:hover {
    transform: scale(1.1) translateY(-5px);
    background: var(--accent-color);
    color: white;
    border-color: rgba(255,255,255,0.3);
}

.fab-btn:hover .text {
    opacity: 1;
    transform: translateX(0);
}

.fab-btn .icon {
    font-size: 1.5rem;
}

@media (max-width: 640px) {
    .floating-controls {
        bottom: 20px;
        right: 20px;
        gap: 10px;
    }
    .fab-btn {
        width: 50px;
        height: 50px;
    }
    .fab-btn .icon {
        font-size: 1.2rem;
    }
}

/* Calendar Grid */
.calendar-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    /* Exactly 4 columns on desktop */
    gap: 1.5rem;
    width: 100%;
    margin-bottom: 2rem;
}

/* Month Card */
.month-card {
    background: var(--glass-bg);
    backdrop-filter: var(--bg-blur);
    -webkit-backdrop-filter: var(--bg-blur);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: var(--glass-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: default;
    /* Removed animation to prevent scroll lag */
}

.month-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
    border-color: var(--accent-color);
}

.month-name {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.days-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    font-weight: 700;
    /* Bold headers */
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.days-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
}

.day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    border-radius: 8px;
    transition: all 0.2s;
    position: relative;
    font-weight: 600;
    /* Bolder day numbers */
}

.day:not(.empty):hover {
    background: var(--glass-border);
    cursor: pointer;
    box-shadow: inset 0 0 10px rgba(255, 255, 255, 0.1);
}

.day.today {
    background: var(--today-bg);
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    font-weight: 700;
    box-shadow: 0 0 15px var(--accent-glow);
}

.pulse-highlight {
    animation: pulse 1s ease 2;
}

@keyframes pulse {
    0% { transform: scale(1); box-shadow: 0 0 0 0 var(--accent-glow); }
    50% { transform: scale(1.2); box-shadow: 0 0 0 15px rgba(2, 132, 199, 0); }
    100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(2, 132, 199, 0); }
}

.day.weekend {
    color: var(--weekend-color);
}

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

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

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

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

/* Glass Footer */
.glass-footer {
    margin-top: auto;
    background: var(--glass-bg);
    backdrop-filter: var(--bg-blur);
    border: 1px solid var(--glass-border);
    border-radius: 15px;
    padding: 1rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Responsive adjustments */
@media (max-width: 1200px) {
    .calendar-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 992px) {
    .calendar-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .calendar-grid {
        grid-template-columns: 1fr;
        /* 1 month per row on mobile */
    }

    .glass-header {
        padding: 1.5rem 1rem;
        gap: 1.25rem;
    }

    .header-left h1 {
        font-size: 1.8rem;
        /* Smaller but still prominent on mobile */
    }

    .controls-group {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
        /* Prevent overflow */
        gap: 0.5rem;
    }

    .year-selector-container {
        order: -1;
        /* Keep year in the middle or top */
    }

    .header-right {
        width: 100%;
        justify-content: center;
    }
}

/* Modal / Popup for Lunar Detail */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: opacity 0.3s ease;
}

.modal-content {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 1rem;
    border-radius: 30px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    max-width: 350px;
    width: 90%;
    text-align: center;
    position: relative;
    backdrop-filter: var(--bg-blur);
    animation: slideUp 0.4s cubic-bezier(0.18, 0.89, 0.32, 1.28);
}

.modal-title {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--accent-color);
}

.modal-body {
    font-size: 1.2rem;
    line-height: 1.8;
}

.close-btn {
    position: absolute;
    top: 12px; /* Slightly adjusted for 1rem padding */
    right: 12px;
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.8rem; /* Made slightly larger */
    line-height: 1;
    cursor: pointer;
    transition: all 0.2s ease;
    z-index: 1010;
}

#close-modal:hover,
.close-btn:hover,
#close-modal:active,
.close-btn:active {
    color: #ff3333 !important;
    transform: scale(1.3);
    font-weight: bold;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }

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