:root {
    --bg-color: #f8f9fa;
    --text-color: #212529;
    --container-bg: rgba(255, 255, 255, 0.8);
    --accent-color: #6366f1;
    --accent-hover: #4f46e5;
    --glass-border: rgba(255, 255, 255, 0.4);
    --box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    --input-bg: #ffffff;
    --input-border: #dee2e6;
    --header-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
}

[data-theme="dark"] {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --container-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.4);
    --input-bg: #1e293b;
    --input-border: #334155;
}

body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    transition: background 0.3s, color 0.3s;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

body.raw-mode {
    justify-content: flex-start;
    align-items: flex-start;
    padding: 2rem;
    background: #ffffff;
    color: #000000;
}

.container {
    width: 95%;
    max-width: 1200px;
    background: var(--container-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--box-shadow);
    padding: 2rem;
    animation: fadeIn 0.8s ease-out;
    margin: 2rem 0;
}

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

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

header {
    text-align: center;
    margin-bottom: 2rem;
    position: relative;
}

h1 {
    margin: 0;
    font-weight: 800;
    background: var(--header-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 2.5rem;
    letter-spacing: -1px;
}

.controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-size: 0.85rem;
    font-weight: 600;
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

select,
input {
    padding: 0.75rem;
    border-radius: 10px;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    color: var(--text-color);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s, opacity 0.2s;
}

select:disabled,
input:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

select:focus,
input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
}

button {
    padding: 0.8rem 1.5rem;
    border-radius: 12px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, background 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

button:active {
    transform: scale(0.98);
}

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

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

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 2rem 0 1rem 0;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 0.5rem;
}

.preview-header h2 {
    margin: 0;
    font-size: 1.2rem;
}

#output {
    margin-top: 1rem;
    width: 100%;
    overflow-x: auto;
}

.calendar-table {
    width: 100%;
    max-width: 280px;
    table-layout: fixed;
    border-collapse: collapse;
    font-family: 'JetBrains Mono', monospace;
    background: rgba(0, 0, 0, 0.02);
    border-radius: 10px;
    overflow: hidden;
    font-size: clamp(0.5rem, 1.5vw, 0.9rem);
    margin: 0 auto;
}

.calendar-table th,
.calendar-table td {
    border: 1px solid var(--glass-border);
    padding: clamp(0.1rem, 0.5vw, 0.4rem);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: clip;
}

.calendar-table th {
    background: rgba(99, 102, 241, 0.1);
    font-weight: 600;
}

.year-view {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
}

.year-view h1 {
    text-align: center;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

.month-card {
    background: rgba(255, 255, 255, 0.05);
    padding: 0.5rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    min-width: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.theme-toggle {
    position: absolute;
    top: 0;
    right: 0;
    padding: 0.5rem;
    background: transparent;
    font-size: 1.5rem;
}

#error-message {
    background: #fee2e2;
    color: #b91c1c;
    padding: 1rem;
    border-radius: 10px;
    margin-bottom: 1rem;
    display: none;
    font-weight: 600;
}

#raw-preview {
    width: 100%;
    margin: 0;
    padding: 1.5rem;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 12px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    white-space: pre;
    word-break: normal;
    border: 1px solid var(--glass-border);
    overflow-x: auto;
}

.hidden {
    display: none !important;
}

@media (max-width: 800px) {
    .controls {
        grid-template-columns: 1fr;
    }

    .buttons {
        flex-direction: column;
    }

    body.raw-mode {
        padding: 0.25rem;
    }

    .month-card {
        padding: 0.15rem;
        border-radius: 6px;
    }

    .month-card h3 {
        font-size: 0.8rem;
        margin: 0.2rem 0;
    }

    .year-view h1 {
        font-size: 1.4rem;
        margin-bottom: 0.5rem;
    }
}