/**
 * Sudoku Game - Base Styles
 * Version: 1.1.1
 * Date Modified: 2025-12-02
 * Author: Doug Hesseltine
 * Copyright: Technologist.Services 2025
 */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    padding: 20px 0 30px;
}

.header-top {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 10px;
}

.back-button {
    padding: 8px 16px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
}

h1 {
    font-size: 2.5em;
    margin: 0;
}

.subtitle {
    font-size: 1.1em;
    opacity: 0.8;
}

/* Controls */
.controls-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.controls-header h2 {
    font-size: 1.3em;
    margin: 0;
}

.toggle-btn {
    padding: 8px 16px;
    border: 2px solid;
    border-radius: 5px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.controls {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.control-row {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.control-row:last-child {
    margin-bottom: 0;
}

.control-row label {
    font-weight: 600;
}

#player-name {
    flex: 1;
    min-width: 200px;
    padding: 10px;
    border: 2px solid;
    border-radius: 5px;
    font-size: 1em;
    transition: border-color 0.3s;
}

select {
    padding: 8px 12px;
    border: 2px solid;
    border-radius: 5px;
    font-size: 1em;
    cursor: pointer;
    transition: border-color 0.3s;
}

/* Slider */
.slider-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

#difficulty-slider {
    width: 100%;
    height: 8px;
    border-radius: 5px;
    outline: none;
    cursor: pointer;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.85em;
    font-weight: 600;
}

/* Checkbox */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-weight: 600;
}

input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* Buttons */
.button-row {
    justify-content: center;
}

.btn {
    padding: 12px 24px;
    border: 2px solid;
    border-radius: 5px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    font-weight: 700;
}

/* HUD */
.hud {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 20px;
    padding: 15px;
    border-radius: 8px;
}

.hud-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.hud-item label {
    font-weight: 600;
}

.hud-item span {
    font-size: 1.3em;
    font-weight: 700;
}

/* Game Container */
.game-container {
    position: relative;
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.board {
    display: inline-grid;
    gap: 0;
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.board.size-4 {
    grid-template-columns: repeat(4, 60px);
    grid-template-rows: repeat(4, 60px);
}

.board.size-6 {
    grid-template-columns: repeat(6, 55px);
    grid-template-rows: repeat(6, 55px);
}

.board.size-9 {
    grid-template-columns: repeat(9, 50px);
    grid-template-rows: repeat(9, 50px);
}

.cell {
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid;
    font-size: 1.5em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
}

.cell:hover:not(.given):not(.completed) {
    transform: scale(1.05);
}

.cell.given {
    font-weight: 700;
    cursor: default;
}

.cell.selected {
    box-shadow: inset 0 0 0 3px;
}

.cell.error {
    background: rgba(255, 0, 0, 0.3) !important;
    animation: shake 0.3s;
}

.cell.completed {
    cursor: default;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

@keyframes regionComplete {
    0% { box-shadow: inset 0 0 0 0px rgba(0, 255, 0, 0); }
    50% { box-shadow: inset 0 0 0 4px rgba(0, 255, 0, 0.8); }
    100% { box-shadow: inset 0 0 0 0px rgba(0, 255, 0, 0); }
}

.cell.region-complete {
    animation: regionComplete 0.6s ease;
}

/* Box borders for visual grouping - THICK AND VISIBLE */
/* 4x4 (2x2 boxes) - Thick right border after col 2 */
.board.size-4 .cell:nth-child(2),
.board.size-4 .cell:nth-child(6),
.board.size-4 .cell:nth-child(10),
.board.size-4 .cell:nth-child(14) {
    border-right-width: 3px;
}

/* 4x4 - Thick bottom border after row 2 (cells 5-8) */
.board.size-4 .cell:nth-child(5),
.board.size-4 .cell:nth-child(6),
.board.size-4 .cell:nth-child(7),
.board.size-4 .cell:nth-child(8) {
    border-bottom-width: 3px;
}

/* 6x6 (3x2 boxes) - Thick right border after col 3 (every 6th starting from 3) */
.board.size-6 .cell:nth-child(3),
.board.size-6 .cell:nth-child(9),
.board.size-6 .cell:nth-child(15),
.board.size-6 .cell:nth-child(21),
.board.size-6 .cell:nth-child(27),
.board.size-6 .cell:nth-child(33) {
    border-right-width: 3px;
}

/* 6x6 - Thick bottom border after rows 2 and 4 (cells 7-12 and 19-24) */
.board.size-6 .cell:nth-child(7),
.board.size-6 .cell:nth-child(8),
.board.size-6 .cell:nth-child(9),
.board.size-6 .cell:nth-child(10),
.board.size-6 .cell:nth-child(11),
.board.size-6 .cell:nth-child(12),
.board.size-6 .cell:nth-child(19),
.board.size-6 .cell:nth-child(20),
.board.size-6 .cell:nth-child(21),
.board.size-6 .cell:nth-child(22),
.board.size-6 .cell:nth-child(23),
.board.size-6 .cell:nth-child(24) {
    border-bottom-width: 3px;
}

/* 9x9 (3x3 boxes) - Thick right border after cols 3 and 6 */
.board.size-9 .cell:nth-child(9n+3),
.board.size-9 .cell:nth-child(9n+6) {
    border-right-width: 3px;
}

/* 9x9 - Thick bottom border after rows 3 and 6 (cells 19-27 and 46-54) */
.board.size-9 .cell:nth-child(n+19):nth-child(-n+27),
.board.size-9 .cell:nth-child(n+46):nth-child(-n+54) {
    border-bottom-width: 3px;
}

/* Pause Overlay */
.pause-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    z-index: 10;
    border-radius: 8px;
}

.pause-message {
    text-align: center;
    padding: 40px;
    border-radius: 10px;
}

.pause-message h2 {
    font-size: 3em;
    margin-bottom: 10px;
}

/* Completion Message */
.completion-message {
    text-align: center;
    padding: 20px;
    margin: 20px auto;
    max-width: 600px;
    border-radius: 10px;
    border: 3px solid;
    animation: slideIn 0.5s ease;
}

.completion-message h3 {
    font-size: 1.8em;
    margin-bottom: 10px;
}

.completion-message p {
    font-size: 1.2em;
    margin: 5px 0;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Number Pad */
.number-pad {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.number-btn {
    width: 50px;
    height: 50px;
    border: 2px solid;
    border-radius: 8px;
    font-size: 1.5em;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
}

.number-btn:hover {
    transform: scale(1.1);
}

.number-btn:active {
    transform: scale(0.95);
}

/* Leaderboard */
.leaderboard-section {
    margin: 40px 0;
}

.leaderboard-section h2 {
    text-align: center;
    margin-bottom: 20px;
    font-size: 2em;
}

.size-tabs,
.difficulty-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.size-tab,
.difficulty-tab {
    padding: 10px 20px;
    border: 2px solid;
    border-radius: 5px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.size-tab:hover,
.difficulty-tab:hover {
    transform: translateY(-2px);
}

.size-tab.active,
.difficulty-tab.active {
    font-weight: 700;
}

#leaderboard-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

#leaderboard-table th,
#leaderboard-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid;
}

#leaderboard-table th {
    font-weight: 700;
    font-size: 1.1em;
}

#leaderboard-table tr:hover {
    background: rgba(255, 255, 255, 0.05);
}

#leaderboard-table td:first-child {
    font-weight: 700;
    text-align: center;
    width: 60px;
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 20px;
    border-top: 1px solid;
    margin-top: 40px;
    opacity: 0.8;
}

footer p {
    margin: 5px 0;
}

/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2em;
    }
    
    .header-top {
        flex-direction: column;
        gap: 10px;
    }
    
    .control-row {
        flex-direction: column;
        align-items: stretch;
    }
    
    .board.size-4 {
        grid-template-columns: repeat(4, 50px);
        grid-template-rows: repeat(4, 50px);
    }
    
    .board.size-6 {
        grid-template-columns: repeat(6, 45px);
        grid-template-rows: repeat(6, 45px);
    }
    
    .board.size-9 {
        grid-template-columns: repeat(9, 40px);
        grid-template-rows: repeat(9, 40px);
    }
    
    .cell {
        font-size: 1.2em;
    }
    
    .hud {
        flex-direction: column;
        gap: 15px;
    }
}

@media (max-width: 480px) {
    .board.size-9 {
        grid-template-columns: repeat(9, 35px);
        grid-template-rows: repeat(9, 35px);
    }
    
    .cell {
        font-size: 1em;
    }
    
    .number-btn {
        width: 40px;
        height: 40px;
        font-size: 1.2em;
    }
}