:root {
    --bg-color: #f0f2f5;
    /* Softer, slightly darker off-white for contrast with cards */
    --text-color: #2d3436;
    --block-empty: #e0e0e0;
    --block-marked: #a8d5e2;
    --block-hover: #d1d1d1;
    --accent-color: #0984e3;
    /* Stronger accent */
    --font-main: 'Outfit', sans-serif;
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    --card-bg: #ffffff;
    --input-bg: #f1f2f6;
    --radius-lg: 16px;
    --radius-md: 8px;
    --radius-sm: 6px;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 40px 20px;
    /* More breathing room */
    display: flex;
    justify-content: center;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    font-weight: 700;
    font-size: 2.5rem;
    margin-bottom: 8px;
    color: var(--text-color);
    letter-spacing: -0.5px;
}

.subtitle {
    font-weight: 400;
    color: #636e72;
    font-size: 1.1rem;
}

.controls {
    display: flex;
    justify-content: center;
    width: fit-content;
    max-width: 1000px;
    margin: 0 auto 20px auto;
    align-items: center;
    border: none;
    /* Remove border */
    border-radius: var(--radius-lg);
    padding: 12px 24px;
    /* Comfortable padding */
    background-color: var(--card-bg);
    box-shadow: var(--card-shadow);
    /* Floating effect */
    flex-wrap: wrap;
    gap: 30px;
}

.controls-left,
.controls-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* Input Styling */
.input-group {
    display: flex;
    align-items: center;
}

.input-group label {
    font-weight: 600;
    color: #636e72;
    margin-right: 8px;
    font-size: 0.9rem;
}

.input-group input {
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    background-color: var(--input-bg);
    width: 70px;
    font-family: var(--font-main);
    font-size: 0.95rem;
    color: var(--text-color);
    transition: all 0.2s;
    text-align: center;
}

.input-group input:focus {
    outline: none;
    background-color: #fff;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(9, 132, 227, 0.1);
}

/* Button Styling */
.btn-secondary {
    background: var(--input-bg);
    border: 1px solid transparent;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-family: var(--font-main);
    font-weight: 500;
    color: #636e72;
    transition: all 0.2s;
}

.btn-secondary:hover {
    background: #dfe6e9;
    color: var(--text-color);
    transform: translateY(-1px);
}

.btn-secondary:active {
    transform: translateY(0);
}

/* Toggle Styling */
.view-toggle {
    display: flex;
    background: var(--input-bg);
    padding: 4px;
    border-radius: var(--radius-md);
    gap: 2px;
}

.view-toggle input[type="radio"] {
    display: none;
}

.toggle-btn {
    padding: 6px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
    color: #636e72;
}

.view-toggle input[type="radio"]:checked+.toggle-btn {
    background: #fff;
    color: var(--accent-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    font-weight: 600;
}

/* Grid Layout */
.grid-container {
    display: grid;
    grid-template-columns: 40px auto;
    /* Labels column + Weeks column */
    gap: 30px 10px;
    /* Increased vertical gap for labels */
    width: fit-content;
    max-width: 1100px;
    overflow-x: auto;
    padding-bottom: 50px;
    padding-top: 30px;
    /* Space for top labels on first row */
    /* Extra space at bottom for last row labels */
    overflow-y: visible;
    /* Ensure labels aren't clipped */
}

.year-label {
    font-size: 0.75rem;
    color: #636e72;
    text-align: right;
    padding-right: 10px;
    line-height: 12px;
    /* Match block height approx */
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

.weeks-row {
    display: flex;
    gap: 3px;
    flex-wrap: nowrap;
    position: relative;
    /* Establish stacking context if needed */
}

.block {
    width: 10px;
    height: 10px;
    background-color: var(--block-empty);
    border-radius: 2px;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s;
    border: 1px solid transparent;
    /* Reserve space for border */
    position: relative;
    /* For absolute positioning of labels */
}

.block:hover {
    transform: scale(1.2);
    z-index: 200;
    /* Highest on hover */
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.2);
}

/* .marked class is now only for the specific block that starts an event */
.block.past {
    border-radius: 50%;
    transform: scale(0.6);
    background-color: #b2bec3;
    /* Default gray if no era color */
    box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.1);
}

.block.event-start {
    border-color: #2d3436;
    transform: scale(1.1);
    z-index: 100;
    /* Ensure start blocks and labels are above other rows */
    cursor: grab;
}

.block.event-start:active {
    cursor: grabbing;
}

.block.drag-over {
    background-color: #ffeaa7 !important;
    transform: scale(1.3);
    z-index: 150;
    box-shadow: 0 0 8px rgba(253, 203, 110, 0.8);
}

/* Event Labels */
.event-label {
    position: absolute;
    font-size: 0.7rem;
    white-space: nowrap;
    color: #636e72;
    pointer-events: auto;
    /* Allow interaction for dragging */
    cursor: grab;
    user-select: none;
    left: 50%;
    transform: translateX(-50%);
    font-weight: 600;
}

.event-label:active {
    cursor: grabbing;
}

.event-label.top {
    bottom: 14px;
    /* block height + gap */
}

.event-label.bottom {
    top: 14px;
    /* block height + gap */
}

/* Connecting tick mark */
.event-label::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    height: 4px;
    background-color: #636e72;
}

.event-label.top::after {
    bottom: -4px;
}

.event-label.bottom::after {
    top: -4px;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .block {
        width: 8px;
        height: 8px;
    }

    .weeks-row {
        gap: 2px;
    }
}

.grid-container.years-view .weeks-row {
    gap: 15px;
}

/* Tooltip */
.tooltip {
    position: absolute;
    background-color: #2d3436;
    color: #fff;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 0.85rem;
    pointer-events: none;
    z-index: 1000;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    max-width: 200px;
    word-wrap: break-word;
    transform: translate(-50%, -100%);
    /* Center above cursor */
    margin-top: -10px;
}

.tooltip.hidden {
    display: none;
}