/* =============================================
   ARENA CTF — DESIGN
   ============================================= */

:root {
    --bg: #0a0a12;
    --bg-surface: #111119;
    --bg-card: #16161f;
    --bg-card-hover: #1c1c28;
    --bg-sidebar: #0d0d15;
    --text: #e4e4ed;
    --text-dim: #7a7a8e;
    --accent: #6c5ce7;
    --accent-glow: #a29bfe;
    --accent-dim: #6c5ce730;
    --green: #00b894;
    --green-dim: #00b89425;
    --red: #ff6b6b;
    --red-dim: #ff6b6b20;
    --orange: #fdcb6e;
    --orange-dim: #fdcb6e20;
    --blue: #74b9ff;
    --pink: #fd79a8;
    --cyan: #00cec9;
    --border: #1e1e2e;
    --radius: 14px;
    --radius-sm: 10px;
    --shadow: 0 8px 32px rgba(0,0,0,0.4);
}

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

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
}

/* BACKGROUND CANVAS */
#bg-canvas {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.4;
}

/* =============================================
   LOGIN
   ============================================= */

.login-screen {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-box {
    text-align: center;
    padding: 3rem 2.5rem;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    width: 440px;
    max-width: 92vw;
    box-shadow: var(--shadow), 0 0 80px rgba(108,92,231,0.08);
    backdrop-filter: blur(20px);
}

.login-icon { font-size: 3.5rem; margin-bottom: 0.8rem; }

.login-box h1 {
    font-size: 2.2rem;
    font-weight: 900;
    letter-spacing: 3px;
    color: var(--text);
    margin-bottom: 0.3rem;
}

.login-box h1 span {
    color: var(--accent);
}

.login-subtitle {
    color: var(--text-dim);
    font-size: 0.9rem;
    margin-bottom: 1.8rem;
}

.login-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.login-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.login-stat strong {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.5rem;
    color: var(--accent-glow);
}

.login-stat span {
    font-size: 0.7rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.input-group {
    position: relative;
    margin-bottom: 1rem;
}

.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.1rem;
}

.input-group input {
    width: 100%;
    padding: 0.95rem 1rem 0.95rem 3rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 1rem;
    font-family: 'JetBrains Mono', monospace;
    outline: none;
    transition: all 0.2s;
}

.input-group input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

.btn-enter {
    width: 100%;
    padding: 0.95rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.2s;
}

.btn-enter:hover {
    background: var(--accent-glow);
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(108,92,231,0.4);
}

/* =============================================
   APP LAYOUT
   ============================================= */

.app {
    display: flex;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

/* SIDEBAR */
.sidebar {
    width: 240px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 50;
}

.sidebar-logo {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.7rem;
    border-bottom: 1px solid var(--border);
}

.sidebar-icon { font-size: 1.6rem; }

.sidebar-logo h2 {
    font-size: 1rem;
    font-weight: 900;
    letter-spacing: 2px;
}

.sidebar-logo h2 span { color: var(--accent); }

.sidebar-nav {
    padding: 1rem 0.8rem;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.7rem 1rem;
    background: transparent;
    color: var(--text-dim);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.15s;
    text-align: left;
}

.nav-item:hover { color: var(--text); background: var(--bg-card); }

.nav-item.active {
    color: white;
    background: var(--accent);
}

.nav-emoji { font-size: 1.1rem; }

/* PROGRESS RING */
.sidebar-progress {
    padding: 1.2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    border-top: 1px solid var(--border);
}

.progress-ring-container { position: relative; }

.progress-ring { transform: rotate(-90deg); }

.progress-ring-bg {
    fill: none;
    stroke: var(--border);
    stroke-width: 5;
}

.progress-ring-fill {
    fill: none;
    stroke: var(--accent);
    stroke-width: 5;
    stroke-linecap: round;
    stroke-dasharray: 213.6;
    stroke-dashoffset: 213.6;
    transition: stroke-dashoffset 0.8s ease;
}

.progress-pct {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: 1rem;
    color: var(--accent-glow);
}

.progress-label {
    font-size: 0.75rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 0.5rem;
}

.progress-detail {
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-top: 0.2rem;
}

/* PLAYER */
.sidebar-player {
    padding: 1rem 1.2rem;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 0.7rem;
}

.player-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.9rem;
}

.player-details { flex: 1; min-width: 0; }

.player-pseudo {
    display: block;
    font-weight: 600;
    font-size: 0.85rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.player-score {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--accent-glow);
}

.btn-logout {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: transparent;
    color: var(--text-dim);
    border: 1px solid var(--border);
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-logout:hover { background: var(--red); color: white; border-color: var(--red); }

/* MAIN */
.main-content {
    flex: 1;
    margin-left: 240px;
    min-height: 100vh;
}

.section { display: none; padding: 2rem 2.5rem; }
.section.active { display: block; }

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.section-header h1 {
    font-size: 1.6rem;
    font-weight: 800;
}

.stats-pills { display: flex; gap: 0.5rem; }

.pill {
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    font-weight: 600;
}

.pill-solved { background: var(--green-dim); color: var(--green); }
.pill-points { background: var(--accent-dim); color: var(--accent-glow); }

/* CATEGORY TABS */
.category-tabs {
    display: flex;
    gap: 0.4rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    background: var(--bg-surface);
    padding: 0.4rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.tab {
    padding: 0.55rem 1rem;
    background: transparent;
    color: var(--text-dim);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 500;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.tab:hover { color: var(--text); background: var(--bg-card); }
.tab.active { color: white; background: var(--accent); }
.tab.active .tab-count { background: rgba(255,255,255,0.2); color: white; }

.tab-count {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    background: var(--bg);
    padding: 0.1rem 0.4rem;
    border-radius: 8px;
    color: var(--text-dim);
}

/* CHALLENGE CARDS */
.challenges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
    gap: 1rem;
}

.challenge-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.4rem;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
}

.challenge-card:hover {
    border-color: var(--accent);
    background: var(--bg-card-hover);
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(108,92,231,0.12);
}

.challenge-card.solved {
    border-color: var(--green);
}

.challenge-card.solved::before {
    content: '✓';
    position: absolute;
    top: 1rem; right: 1rem;
    width: 26px; height: 26px;
    background: var(--green);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
}

.card-header { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.8rem; }

.card-cat-icon {
    width: 36px; height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

.card-cat-icon.linux { background: #74b9ff20; }
.card-cat-icon.crypto { background: #a29bfe20; }
.card-cat-icon.forensics { background: #fdcb6e20; }
.card-cat-icon.reseau { background: #fd79a820; }
.card-cat-icon.web { background: #00b89420; }
.card-cat-icon.reverse { background: #ff6b6b20; }

.card-cat-name {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-dim);
}

.challenge-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.4rem; line-height: 1.3; }

.card-desc {
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-bottom: 1rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-footer { display: flex; align-items: center; justify-content: space-between; }

.card-points {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--accent-glow);
}

.card-diff {
    font-size: 0.72rem;
    padding: 0.25rem 0.7rem;
    border-radius: 8px;
    font-weight: 600;
}

.diff-facile { background: var(--green-dim); color: var(--green); }
.diff-moyen { background: var(--orange-dim); color: var(--orange); }
.diff-difficile { background: var(--red-dim); color: var(--red); }
.diff-tres_difficile { background: #e84393; color: white; }

/* LOADING */
.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 4rem;
    color: var(--text-dim);
}

.spinner {
    width: 32px; height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* =============================================
   MODAL
   ============================================= */

.modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 2rem;
    max-width: 620px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: var(--shadow);
    animation: modalIn 0.25s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-close {
    position: absolute;
    top: 1.2rem; right: 1.2rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 36px; height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-dim);
    cursor: pointer;
    transition: all 0.2s;
}

.modal-close:hover { background: var(--red); color: white; border-color: var(--red); }

.modal-top { display: flex; gap: 0.5rem; margin-bottom: 0.8rem; }

.modal-cat-badge, .modal-diff-badge {
    padding: 0.25rem 0.7rem;
    border-radius: 8px;
    font-size: 0.75rem;
    font-weight: 600;
}

.modal-cat-badge { background: var(--accent-dim); color: var(--accent-glow); }

.modal-content h2 { font-size: 1.3rem; font-weight: 800; margin-bottom: 0.3rem; }

.modal-points-display {
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent-glow);
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 1.2rem;
}

.modal-body {
    background: var(--bg);
    padding: 1.3rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.2rem;
    font-size: 0.88rem;
    line-height: 1.8;
    white-space: pre-wrap;
    border: 1px solid var(--border);
    color: var(--text);
}

/* HINT */
.modal-hint-section { margin-bottom: 1rem; }

.btn-hint {
    padding: 0.5rem 1rem;
    background: var(--orange-dim);
    color: var(--orange);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-hint:hover { border-color: var(--orange); }

.hint-box {
    background: var(--orange-dim);
    border: 1px solid var(--orange);
    padding: 0.8rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--orange);
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.solved-banner {
    background: var(--green-dim);
    border: 1px solid var(--green);
    color: var(--green);
    padding: 0.9rem;
    border-radius: var(--radius-sm);
    text-align: center;
    font-weight: 700;
    margin-bottom: 1rem;
}

/* FLAG FORM */
.flag-form { margin-top: 1rem; }

.flag-input-group {
    display: flex;
    align-items: center;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: 0.8rem;
    transition: border-color 0.2s;
}

.flag-input-group:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

.flag-prefix {
    padding: 0 0.8rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-dim);
    font-weight: 600;
    font-size: 0.9rem;
    white-space: nowrap;
}

.flag-input-group input {
    flex: 1;
    padding: 0.85rem 0.5rem;
    background: transparent;
    border: none;
    color: var(--text);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    outline: none;
}

.btn-submit {
    width: 100%;
    padding: 0.85rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.2s;
}

.btn-submit:hover {
    background: var(--accent-glow);
    box-shadow: 0 4px 20px rgba(108,92,231,0.3);
}

.flag-result {
    margin-top: 0.8rem;
    padding: 0.7rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    text-align: center;
    display: none;
}

.flag-result.correct { display: block; background: var(--green-dim); color: var(--green); border: 1px solid var(--green); }
.flag-result.wrong { display: block; background: var(--red-dim); color: var(--red); border: 1px solid var(--red); }

/* =============================================
   SCOREBOARD
   ============================================= */

.scoreboard-container { max-width: 650px; }

.score-row {
    display: flex;
    align-items: center;
    padding: 1rem 1.3rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
    transition: all 0.2s;
}

.score-row:hover { border-color: var(--accent); transform: translateX(4px); }

.score-row.top-1 { border-color: gold; background: rgba(255,215,0,0.05); }
.score-row.top-2 { border-color: silver; background: rgba(192,192,192,0.03); }
.score-row.top-3 { border-color: #cd7f32; background: rgba(205,127,50,0.03); }

.score-rank {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 800;
    font-size: 1.1rem;
    width: 40px;
    text-align: center;
    color: var(--text-dim);
}

.score-row.top-1 .score-rank { color: gold; font-size: 1.4rem; }
.score-row.top-2 .score-rank { color: silver; font-size: 1.3rem; }
.score-row.top-3 .score-rank { color: #cd7f32; font-size: 1.2rem; }

.score-name { flex: 1; margin-left: 1rem; font-weight: 600; }

.score-pts {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    color: var(--accent-glow);
}

/* TERMINAL */
.terminal-info {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 0.7rem 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    font-size: 0.8rem;
    color: var(--text-dim);
}

.btn-newtab {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    color: var(--accent-glow);
    text-decoration: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-newtab:hover { border-color: var(--accent); background: var(--accent-dim); }

.terminal-embed {
    background: #000;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
}

.terminal-embed iframe { width: 100%; height: calc(100vh - 220px); min-height: 400px; }

/* TOAST */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    z-index: 2000;
    transition: transform 0.3s ease;
    pointer-events: none;
}

.toast.show { transform: translateX(-50%) translateY(0); }
.toast.success { background: var(--green); color: white; }
.toast.error { background: var(--red); color: white; }

/* =============================================
   RESPONSIVE
   ============================================= */

@media (max-width: 900px) {
    .sidebar { display: none; }
    .main-content { margin-left: 0; }
    .section { padding: 1.2rem; }
    .challenges-grid { grid-template-columns: 1fr; }
}