:root {
    --bg-color: #050505;
    --card-bg: #141414;
    --text-color: #e0e0e0;
    --accent-color: #00ff9d;
    /* Neon Green */
    --accent-glow: rgba(0, 255, 157, 0.4);
    --accent-dim: rgba(0, 255, 157, 0.1);
    --error-color: #ff2a6d;
    --grid-border: #333;
    --font-main: 'Inter', sans-serif;
    --font-mono: 'Space Mono', monospace;
}

* {
    box-sizing: border-box;
    user-select: none;
    -webkit-user-select: none;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    display: flex;
    justify-content: center;
    min-height: 100vh;
    background-image:
        linear-gradient(0deg, rgba(0, 255, 157, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 255, 157, 0.03) 1px, transparent 1px);
    background-size: 30px 30px;
}

.app-container {
    width: 100%;
    max-width: 600px;
    background-color: rgba(10, 10, 10, 0.95);
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow-y: auto;
    position: relative;
    border-left: 1px solid #222;
    border-right: 1px solid #222;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.8);
}

/* Header */
header {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #333;
    background-color: rgba(20, 20, 20, 0.8);
    backdrop-filter: blur(10px);
    z-index: 10;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 1.5rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        text-shadow: 0 0 0 var(--accent-dim);
        transform: scale(1);
    }

    50% {
        text-shadow: 0 0 20px var(--accent-glow);
        transform: scale(1.1);
    }

    100% {
        text-shadow: 0 0 0 var(--accent-dim);
        transform: scale(1);
    }
}

header h1 {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 900;
    letter-spacing: 1px;
    text-transform: uppercase;
    background: linear-gradient(to right, #fff, var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.date-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 255, 157, 0.1);
    padding: 4px;
    border-radius: 6px;
    border: 1px solid var(--accent-color);
}

.nav-arrow {
    background: none;
    border: none;
    color: var(--accent-color);
    cursor: pointer;
    font-size: 1rem;
    padding: 0 5px;
    transition: opacity 0.2s;
}

.nav-arrow:disabled {
    opacity: 0.3;
    cursor: default;
}

.date-display {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-color);
    cursor: pointer;
    padding: 2px 5px;
    border-radius: 4px;
}

.date-display:hover {
    background: rgba(0, 255, 157, 0.2);
}

#today-btn {
    background: var(--accent-color);
    color: #000;
    border: none;
    font-size: 0.7rem;
    font-weight: bold;
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
}

#today-btn.hidden {
    display: none;
}

#stats-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 5px;
    transition: transform 0.2s;
}

#stats-btn:hover {
    transform: scale(1.1);
}

main {
    padding: 20px;
}

/* GRID LAYOUT */
.grid-container {
    display: grid;
    grid-template-columns: 80px 1fr 1fr 1fr;
    grid-template-rows: auto 1fr 1fr 1fr;
    gap: 8px;
    margin-bottom: 20px;
    padding: 10px;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 12px;
    border: 1px solid #333;
}

.grid-header {
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.8rem;
    text-align: center;
    color: #888;
    text-transform: uppercase;
    padding: 5px;
    font-family: var(--font-mono);
}

.col-header {
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 10px;
    color: var(--accent-color);
    text-shadow: 0 0 5px var(--accent-glow);
}

.row-header {
    border-right: 2px solid var(--accent-color);
    padding-right: 10px;
    justify-content: flex-end;
    color: var(--accent-color);
    text-shadow: 0 0 5px var(--accent-glow);
}

.grid-cell {
    background-color: #1a1a1a;
    border: 1px solid #333;
    border-radius: 8px;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 5px;
    transition: all 0.2s;
    position: relative;
}

.grid-cell.drag-over {
    background-color: var(--accent-dim);
    border-color: var(--accent-color);
    box-shadow: inset 0 0 20px var(--accent-glow);
}

.grid-cell.correct {
    background-color: rgba(0, 255, 157, 0.1);
    border-color: var(--accent-color);
    box-shadow: 0 0 15px var(--accent-glow);
}

.grid-cell.wrong {
    background-color: rgba(255, 42, 109, 0.1);
    border-color: var(--error-color);
    animation: shake 0.4s;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    75% {
        transform: translateX(5px);
    }
}

/* DECK AREA */
.deck-area {
    background-color: #111;
    padding: 15px;
    border-radius: 12px;
    border: 1px solid #333;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.5);
}

.deck-area h3 {
    margin: 0 0 15px 0;
    font-size: 0.9rem;
    text-transform: uppercase;
    color: #666;
    letter-spacing: 1px;
}

.deck-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 10px;
    min-height: 100px;
}

/* CARDS */
.item-card {
    background: linear-gradient(145deg, #2a2a30, #222);
    color: #fff;
    padding: 10px;
    border-radius: 6px;
    font-size: 0.85rem;
    text-align: center;
    cursor: grab;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    border: 1px solid #444;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    min-height: 60px;
    transition: all 0.2s;
    touch-action: none;
    /* Critical for mobile drag */
}

.item-card:active {
    cursor: grabbing;
    transform: scale(0.95);
    border-color: var(--accent-color);
    box-shadow: 0 0 15px var(--accent-glow);
}

.item-card.ghost {
    opacity: 0.4;
    background-color: var(--accent-color);
    border: 1px dashed #fff;
}

/* BUTTONS */
.action-btn {
    width: 100%;
    padding: 16px;
    background: var(--accent-color);
    color: #000;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 900;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: auto;
    transition: all 0.2s;
    box-shadow: 0 0 15px var(--accent-glow);
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 25px var(--accent-glow);
}

.action-btn.secondary {
    background-color: transparent;
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
    box-shadow: none;
}

.action-btn.secondary:hover {
    background-color: var(--accent-dim);
}

.action-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: #444;
    color: #888;
    box-shadow: none;
    transform: none;
}

/* OVERLAY */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 1;
    transition: opacity 0.3s;
}

.overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.result-card {
    background-color: #1a1a1a;
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    width: 85%;
    border: 1px solid var(--accent-color);
    box-shadow: 0 0 50px rgba(0, 255, 157, 0.2);
    max-height: 90vh;
    overflow-y: auto;
}

.stars {
    font-size: 2.5rem;
    margin: 20px 0;
    text-shadow: 0 0 20px rgba(255, 215, 0, 0.5);
}

#result-title {
    margin-top: 0;
    font-size: 1.5rem;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* STATS MODAL */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

.stat-box {
    background: #222;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #333;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--accent-color);
}

.stat-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    color: #888;
    margin-top: 5px;
}

.stats-chart {
    margin-top: 20px;
    text-align: left;
}

.chart-row {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
    font-size: 0.8rem;
}

.chart-label {
    width: 20px;
    text-align: right;
    margin-right: 10px;
}

.chart-bar-container {
    flex: 1;
    background: #222;
    height: 10px;
    border-radius: 5px;
    overflow: hidden;
}

.chart-bar {
    height: 100%;
    background: var(--accent-color);
}

/* Calendar Styles */
.calendar-card {
    width: 90%;
    max-width: 400px;
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.icon-btn {
    background: none;
    border: 1px solid #333;
    color: #aaa;
    font-size: 0.8rem;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: 20px;
    transition: all 0.2s;
    font-family: var(--font-mono);
}

.icon-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 5px;
}

.cal-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    cursor: pointer;
    border: 1px solid #333;
    background: #222;
    color: #666;
}

.cal-day.has-data {
    color: #fff;
    border-color: #555;
}

.cal-day.has-data:hover {
    border-color: var(--accent-color);
    background: #333;
}

.cal-day.selected {
    background: var(--accent-color);
    color: #000;
    font-weight: bold;
    box-shadow: 0 0 10px var(--accent-glow);
}

.cal-day.today {
    border: 1px solid var(--accent-color);
}

.cal-day.empty {
    background: transparent;
    border: none;
    cursor: default;
}