:root {
    --bg-gradient-1: #839ab3;
    --bg-gradient-2: #cacaca;

    --panel-bg: #1e293b;         /* Bleu nuit */
    --text-color: #ffffff;

    --board-border: #1e293b;
    --case-white: #ddd;
    --case-black: #3d4c63;       /* Bleu gris */

    --btn-generic-bg: #3d4c63;
    --btn-hover: #667ea4;

    --btn-primary-bg: #00a800;
    --btn-primary-shadow: #006d00;
    --btn-primary-hover: #068d06;

    --btn-secondary-bg: #475569;
    --btn-secondary-shadow: #2f3946;
    --btn-secondary-hover: #404b5d;


    --gold: #ffd700;
    --blue-accent: #0542c8;
    --shadow-accent: 0 0 10px rgba(5, 66, 200, 0.8);
    --shadow-hover: 0 0 10px #546786;



    --btn-toggle-bg: transparent;
    --btn-toggle-border: rgba(255,255,255,0.2);

    --sidebar-width: 260px;

    --select-bg: #ffffff;
    --select-hover: #d6d5d5;
    --select-border: #cbd5e1;
    --select-text: #3d4c63;
    --select-icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23475569'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
}

body.dark-mode {
    --bg-gradient-1: #2c2c2c;
    --bg-gradient-2: #000000;

    --panel-bg: #121212;         /* Noir très foncé */
    --text-color: #e0e0e0;

    --board-border: #333;
    --case-white: #b0b0b0;       /* Gris clair */
    --case-black: #333333;       /* Gris foncé */

    --btn-generic-bg: #222222;
    --btn-hover: #404040;

    --btn-primary-bg: #008d00;
    --btn-primary-shadow: #005600;
    --btn-primary-hover: #057905;

    --btn-secondary-bg: #3a4656;
    --btn-secondary-shadow: #252c37;
    --btn-secondary-hover: #2c3440;

    --blue-accent: #0542c8;
    --shadow-accent: 0 0 10px rgba(5, 66, 200, 0.8);
    --shadow-hover: 0 0 10px #575757;

    --btn-toggle-bg: #222;
    --btn-toggle-border: #444;

    --select-bg: #222222;
    --select-hover: #3b3a3a;
    --select-border: #444444;
    --select-text: #e0e0e0;
    --select-icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23e0e0e0'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");

}


body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', sans-serif;
    color: var(--text-color);
    min-height: 100vh;
    background-color: var(--bg-gradient-2);
    background-image:
            linear-gradient(45deg, var(--bg-gradient-1) 25%, transparent 25%, transparent 75%, var(--bg-gradient-1) 75%, var(--bg-gradient-1) 100%),
            linear-gradient(45deg, var(--bg-gradient-1) 25%, var(--bg-gradient-2) 25%, var(--bg-gradient-2) 75%, var(--bg-gradient-1) 75%, var(--bg-gradient-1) 100%);
    background-size: 210px 210px;
    background-position: 0 0, 105px 105px;
    background-attachment: fixed;
    transition: background-image 0.3s ease, color 0.3s ease;
}


.main-container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 20px;
    min-height: 100vh;
    padding: 20px;
    box-sizing: border-box;
    margin-left: var(--sidebar-width);
    width: calc(100% - var(--sidebar-width));
}

.side-column {
    width: 280px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.center-column {
    flex: 1;
    max-width: 650px;
    text-align: center;
}

.main-title {
    color: var(--panel-bg);
}
body:not(.dark-mode) .main-title { color: #1e293b; }
body.dark-mode .main-title { color: #e0e0e0; }

.dark-panel {
    background: var(--panel-bg);
    padding: 18px;
    border-radius: 12px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.6);
    border: 1px solid #444;
    transition: background-color 0.3s ease;
}

.mini-panel { padding: 10px 15px; }
.small-title { font-size: 0.9em; margin-bottom: 8px; }
.gold-text { color: var(--gold); margin-bottom: 10px; font-weight: bold; }
.flex-row { display: flex; gap: 8px; margin-bottom: 10px; }
.flex-row .action-btn, .flex-row .color-btn { flex: 1; }

/* Sélecteur de pièces */
.piece-buttons { display: flex; justify-content: space-between; margin-bottom: 15px; }

.piece-btn {
    background: var(--btn-generic-bg);
    border: 1px solid #555;
    color: #ddd;
    border-radius: 6px;
    width: 46px; height: 46px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; font-size: 30px;
    transition: all 0.2s;
}

.piece-btn:hover {
    background: var(--btn-hover);
    box-shadow: var(--shadow-hover);
}
.piece-btn.selected {
    background: var(--blue-accent);
    box-shadow: var(--shadow-accent);
}

.schema-grid.mini { display: flex; justify-content: space-between; gap: 8px; }
.schema-item {
    display: flex;
    flex-direction: column;
    flex: 1;
    background: rgba(0, 0, 0, 0.2);
    padding: 6px;
    border-radius: 6px;
    text-align: center;
    font-size: 0.7em;
    justify-content: center;
    align-items: center;
}
.schema-img-small { width: 32px; height: 32px; object-fit: contain; margin-bottom: 2px; }

.schema-item span {
    white-space: nowrap;
    margin-top: 5px;
    display: block;
}

.trophy-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.trophy-item {
    display: flex;
    flex-direction: column;
    flex: 1;
    background: rgba(0, 0, 0, 0.2);
    padding: 6px;
    border-radius: 6px;
    text-align: center;
    font-size: 0.7em;
    justify-content: center;
    align-items: center;
}
.trophy-img, .mini-trophy { width: 28px; height: 28px; }
.trophy-item span {
    margin-top: 5px;
    display: block;
}
.locked { opacity: 0.2; filter: grayscale(1); }
.unlocked { opacity: 1; border-color: var(--gold); }

.leader-list {
    padding: 0;
    margin: 0;
    list-style: none;
}

.leader-list li {
    display: flex;
    align-items: baseline;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    width: 100%;
}

.leader-name {
    flex-shrink: 0;
    text-align: left;
    padding-left: 0;
}

.leader-spacer {
    flex-grow: 1;
    border-bottom: 1px dotted #555;
    margin: 0 8px;
    height: 1px;
    position: relative;
    top: -4px;
}

.leader-points {
    flex-shrink: 0;
    text-align: right;
    min-width: 65px;
}
.leader-points strong {
    color: var(--gold);
}

.board-wrapper {
    display: inline-block;
    padding: 15px;
    background: var(--panel-bg);
    border-radius: 12px;
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.6);
    transition: background-color 0.3s ease;
}

.board {
    display: grid;
    grid-template-columns: repeat(8, 65px);
    grid-template-rows: repeat(8, 65px);
    border: 4px solid var(--board-border);
    transition: border-color 0.3s ease;
}

.case {
    width: 65px; height: 65px;
    display: flex; align-items: center; justify-content: center;
    font-size: 45px; cursor: pointer; position: relative;
}
.case.white { background: var(--case-white); transition: background 0.3s; }
.case.black { background: var(--case-black); transition: background 0.3s; }

.coord {
    position: absolute; bottom: 2px; right: 4px;
    font-size: 12px; font-weight: 600; line-height: 1; pointer-events: none; z-index: 5;
}
.case.white .coord { color: rgba(0, 0, 0, 0.5); }
.case.black .coord { color: rgba(255, 255, 255, 0.5); }


.action-btn:active { transform: scale(0.98); }

.btn-primary {
    background-color: var(--btn-primary-bg);
    box-shadow: 0 2px 0 var(--btn-primary-shadow);
    color: white !important;
}

.btn-primary:hover {
    background-color: var(--btn-primary-hover);
}

.btn-primary:active {
    box-shadow: 0 1px 0 var(--btn-primary-shadow);
}

.btn-secondary {
    background-color: var(--btn-secondary-bg);
    box-shadow: 0 2px 0 var(--btn-secondary-shadow);
}

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

.btn-secondary:active {
    box-shadow: 0 1px 0 var(--btn-secondary-shadow);
}

.theme-toggle-btn {
    background: var(--btn-toggle-bg);
    border: 1px solid var(--btn-toggle-border);
    color: var(--gold);
    margin: 0 20px 10px 20px;
    width: calc(100% - 40px);
}

.action-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    font-family: 'Inter', sans-serif;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
    text-decoration: none;
}
.action-btn:hover { background:#475569FF; transform: translateY(-2px); box-shadow: 0 5px 15px rgba(77, 77, 77, 0.2); }

.reset-btn{
    background-color: var(--btn-generic-bg);
    color: white;
    display: block !important;
    width: fit-content;
    margin-left: auto !important;
    margin-right: auto !important;
    margin-top: 10px;
    margin-bottom: 10px;
}
.reset-btn:hover { background:var(--btn-hover) }


.form-select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    width: 100%;
    padding: 12px 40px 12px 15px;
    border-radius: 8px;
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    line-height: 1.5;
    transition: all 0.3s ease;

    background-color: var(--select-bg);
    border: 1px solid var(--select-border);
    color: var(--select-text);
    background-image: var(--select-icon);

    background-repeat: no-repeat;
    background-position: right 15px center;
    background-size: 16px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}
#diffSelect {
    margin-bottom: 15px;
}

.form-select:hover {
    background-color: var(--select-hover);
}

.form-select option {
    background-color: var(--select-hover);
    color: var(--select-text);
}

#theme-toggle i {
    width: 20px;
    text-align: center;
    color: var(--gold);
}

body.dark-mode #theme-toggle i {
    color: #ffd700;
}


.color-btn, .mode-btn {
    flex: 1;
    border: 2px solid transparent;
    background-color: var(--btn-generic-bg);
    color: #ffffff;
}
.color-btn:hover, .color-btn.active, .color-btn.selected, .mode-btn:hover, .mode-btn.active, .mode-btn.selected {
    transform: translateY(-2px);
    background:var(--btn-hover);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.board-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    border-radius: 8px;
    backdrop-filter: blur(3px);  }

.loader-text {
    text-align: center;
    color: var(--gold);
}

.loader-text i {
    font-size: 3rem;
    margin-bottom: 10px;
    display: block;
}

.loader-text p {
    margin: 0;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.admin-form { max-width: 600px; margin: 40px auto; padding: 20px; background: #2a2a2a; border-radius: 8px; border: 1px solid var(--gold); }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; color: var(--gold); margin-bottom: 5px; }
.form-group input { width: 100%; padding: 8px; background: #1a1a1a; border: 1px solid #444; color: white; border-radius: 4px; }

.plateau-verrouille {
    cursor: not-allowed;
    filter: grayscale(30%);
}

.plateau-verrouille .case {
    pointer-events: none;
}

.custom-input-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 0.85em;
    color: #ddd;
}

.input-mini {
    width: 50px;
    background: rgba(0,0,0,0.3);
    border: 1px solid #555;
    color: white;
    padding: 2px 5px;
    border-radius: 8px;
    text-align: center;
}

.input-mini:focus {
    border-color: #ffcc00;
    outline: none;
}