@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

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

:root {
    --bg-main: #1a1a2e;
    --bg-sidebar: #16162a;
    --bg-card: #222240;
    --bg-card-hover: #2a2a4a;
    --bg-input: #1a1a35;
    --accent: #e2c84b;
    --accent-hover: #f0d85a;
    --accent-dim: rgba(226, 200, 75, 0.15);
    --text-primary: #e8e8f0;
    --text-secondary: #8888a8;
    --text-muted: #5c5c7a;
    --border: #2e2e50;
    --border-light: #3a3a5c;
    --success: #4ade80;
    --success-bg: rgba(74, 222, 128, 0.1);
    --danger: #f87171;
    --danger-bg: rgba(248, 113, 113, 0.1);
    --info: #60a5fa;
    --info-bg: rgba(96, 165, 250, 0.1);
    --warning: #e2c84b;
    --warning-bg: rgba(226, 200, 75, 0.1);
    --radius: 16px;
    --radius-sm: 10px;
    --radius-pill: 50px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
}

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

/* ===== LAYOUT ===== */
.app-layout {
    display: flex;
    min-height: 100vh;
}

/* ===== SIDEBAR ===== */
.sidebar {
    width: 240px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    padding: 28px 20px;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 8px;
    margin-bottom: 36px;
    text-decoration: none;
}

.sidebar-brand .brand-icon {
    width: 36px;
    height: 36px;
    background: var(--accent);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #1a1a2e;
    font-weight: 800;
}

.sidebar-brand .brand-text {
    font-size: 1.05em;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.sidebar-brand .brand-text span {
    display: block;
    font-size: 0.65em;
    font-weight: 400;
    color: var(--text-secondary);
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

/* User profile in sidebar */
.sidebar-user {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 0;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.sidebar-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), #c9a82c);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    font-weight: 700;
    color: #1a1a2e;
    margin-bottom: 10px;
}

.sidebar-username {
    font-size: 0.95em;
    font-weight: 600;
    color: var(--text-primary);
}

.sidebar-role {
    font-size: 0.75em;
    color: var(--text-secondary);
    background: var(--accent-dim);
    padding: 2px 10px;
    border-radius: var(--radius-pill);
    margin-top: 6px;
}

/* Nav items */
.sidebar-nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9em;
    font-weight: 500;
    transition: all 0.2s;
}

.sidebar-nav a:hover {
    background: var(--accent-dim);
    color: var(--text-primary);
}

.sidebar-nav a.active {
    background: var(--accent);
    color: #1a1a2e;
    font-weight: 600;
}

.sidebar-nav a .nav-icon {
    font-size: 1.15em;
    width: 22px;
    text-align: center;
}

.sidebar-bottom {
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

/* ===== MAIN CONTENT ===== */
.main-content {
    flex: 1;
    margin-left: 240px;
    padding: 32px 36px;
    min-height: 100vh;
}

/* Top bar */
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.top-bar h1 {
    font-size: 1.6em;
    font-weight: 700;
    color: var(--text-primary);
}

.top-bar .search-box {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    padding: 8px 18px;
    min-width: 240px;
}

.top-bar .search-box input {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 0.85em;
    outline: none;
    width: 100%;
}

.top-bar .search-box input::placeholder { color: var(--text-muted); }

.top-bar .search-icon { color: var(--text-muted); font-size: 0.85em; }

.top-bar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.score-pill {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--accent-dim);
    border: 1px solid rgba(226, 200, 75, 0.3);
    border-radius: var(--radius-pill);
    padding: 7px 16px;
    font-size: 0.85em;
    font-weight: 600;
    color: var(--accent);
}

/* ===== CARDS ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
    transition: all 0.25s;
}

.card h2 {
    color: var(--text-primary);
    font-size: 1.05em;
    font-weight: 600;
    margin-bottom: 12px;
}

.card p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.9em;
}

.card-accent {
    border-color: var(--accent);
    background: linear-gradient(135deg, var(--bg-card), rgba(226, 200, 75, 0.05));
}

/* ===== CHALLENGE GRID ===== */
.challenge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 18px;
}

.challenge-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: all 0.25s;
    position: relative;
    overflow: hidden;
}

.challenge-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--border);
    transition: background 0.25s;
}

.challenge-card:hover {
    border-color: var(--accent);
    background: var(--bg-card-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.challenge-card:hover::before {
    background: var(--accent);
}

.challenge-card .challenge-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.challenge-num {
    font-size: 0.7em;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--accent);
}

.challenge-card h3 {
    color: var(--text-primary);
    font-size: 1em;
    font-weight: 600;
}

.challenge-card .desc {
    color: var(--text-secondary);
    font-size: 0.8em;
    line-height: 1.6;
}

/* ===== BADGES ===== */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    font-size: 0.68em;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.badge-critical { background: var(--danger-bg); color: var(--danger); border: 1px solid rgba(248, 113, 113, 0.2); }
.badge-high { background: var(--warning-bg); color: var(--warning); border: 1px solid rgba(226, 200, 75, 0.2); }
.badge-medium { background: var(--info-bg); color: var(--info); border: 1px solid rgba(96, 165, 250, 0.2); }
.badge-solved { background: var(--success-bg); color: var(--success); border: 1px solid rgba(74, 222, 128, 0.2); }

/* ===== FORMS ===== */
label {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 6px;
    font-size: 0.82em;
    font-weight: 500;
    letter-spacing: 0.3px;
}

input[type="text"], input[type="password"], input[type="number"],
input[type="url"], input[type="email"],
textarea, select {
    width: 100%;
    padding: 11px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.9em;
    font-family: 'Inter', sans-serif;
    margin-bottom: 16px;
    outline: none;
    transition: border-color 0.2s;
}

input:focus, textarea:focus, select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%238888a8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}

/* ===== BUTTONS ===== */
button, .btn {
    padding: 10px 24px;
    background: var(--accent);
    color: #1a1a2e;
    border: none;
    border-radius: var(--radius-pill);
    font-size: 0.88em;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
    letter-spacing: 0.2px;
}

button:hover, .btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(226, 200, 75, 0.3);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-dim);
    box-shadow: none;
}

.btn-danger {
    background: var(--danger);
    color: #fff;
}

.btn-danger:hover {
    background: #ef4444;
    box-shadow: 0 4px 16px rgba(248, 113, 113, 0.3);
}

.btn-sm {
    padding: 7px 16px;
    font-size: 0.8em;
}

/* ===== FLASH MESSAGES ===== */
.flash {
    padding: 12px 18px;
    border-radius: var(--radius-sm);
    margin-bottom: 18px;
    font-size: 0.88em;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
}

.flash-success { background: var(--success-bg); border: 1px solid rgba(74, 222, 128, 0.2); color: var(--success); }
.flash-error { background: var(--danger-bg); border: 1px solid rgba(248, 113, 113, 0.2); color: var(--danger); }
.flash-info { background: var(--info-bg); border: 1px solid rgba(96, 165, 250, 0.2); color: var(--info); }
.flash-warning { background: var(--warning-bg); border: 1px solid rgba(226, 200, 75, 0.2); color: var(--warning); }

/* ===== HINT BOX ===== */
.hint-box {
    background: var(--warning-bg);
    border: 1px solid rgba(226, 200, 75, 0.2);
    border-left: 3px solid var(--accent);
    padding: 16px 20px;
    margin: 18px 0;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.88em;
    line-height: 1.7;
    color: var(--text-secondary);
}

.hint-box strong { color: var(--accent); }

/* ===== RESULT / CODE BOXES ===== */
.result-box {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    margin: 14px 0;
    font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
    font-size: 0.85em;
    white-space: pre-wrap;
    word-break: break-all;
    line-height: 1.6;
    color: var(--text-primary);
}

code {
    background: var(--accent-dim);
    padding: 2px 8px;
    border-radius: 5px;
    font-size: 0.85em;
    color: var(--accent);
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

pre {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 18px 20px;
    overflow-x: auto;
    font-size: 0.82em;
    margin: 14px 0;
    line-height: 1.7;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    color: var(--text-secondary);
}

/* ===== FLAG BOX ===== */
.flag-box {
    background: linear-gradient(135deg, rgba(74, 222, 128, 0.08), rgba(74, 222, 128, 0.02));
    border: 1px solid rgba(74, 222, 128, 0.25);
    border-radius: var(--radius);
    padding: 28px;
    margin: 24px 0;
    text-align: center;
}

.flag-box p { color: var(--success); font-weight: 500; }

.flag-box .flag {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 1.15em;
    color: var(--success);
    font-weight: 700;
    margin: 8px 0;
    padding: 10px;
    background: var(--success-bg);
    border-radius: var(--radius-sm);
    display: inline-block;
}

/* ===== TABLE ===== */
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 14px 0;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border);
}

th, td {
    padding: 12px 16px;
    text-align: left;
    font-size: 0.88em;
}

th {
    background: var(--bg-input);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.78em;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    border-bottom: 1px solid var(--border);
}

td {
    background: transparent;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--accent-dim); }

/* ===== SCORE BAR ===== */
.score-bar {
    background: var(--border);
    border-radius: var(--radius-pill);
    height: 8px;
    overflow: hidden;
}

.score-fill {
    background: linear-gradient(90deg, var(--accent), #f0d85a);
    height: 100%;
    border-radius: var(--radius-pill);
    transition: width 0.6s ease;
}

.progress-section {
    margin-bottom: 28px;
}

.progress-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 0.85em;
}

.progress-label span:first-child { color: var(--text-secondary); }
.progress-label span:last-child { color: var(--accent); font-weight: 600; }

/* ===== TWO COL ===== */
.two-col { display: flex; gap: 20px; }
.two-col > * { flex: 1; }

/* ===== LOGIN PAGE ===== */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--bg-main);
    position: relative;
    overflow: hidden;
}

.login-page::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(226, 200, 75, 0.08), transparent 70%);
    top: -100px;
    right: -100px;
    pointer-events: none;
}

.login-page::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(96, 165, 250, 0.06), transparent 70%);
    bottom: -100px;
    left: -100px;
    pointer-events: none;
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 0 20px;
    z-index: 1;
}

.login-brand {
    text-align: center;
    margin-bottom: 32px;
}

.login-brand .brand-icon {
    width: 56px;
    height: 56px;
    background: var(--accent);
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    color: #1a1a2e;
    font-weight: 800;
    margin-bottom: 16px;
}

.login-brand h1 {
    font-size: 1.5em;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.login-brand p {
    color: var(--text-secondary);
    font-size: 0.88em;
}

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow-lg);
}

.login-card h2 {
    font-size: 1.1em;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.login-card button {
    width: 100%;
    padding: 12px;
    margin-top: 8px;
    justify-content: center;
    font-size: 0.95em;
}

.login-footer {
    text-align: center;
    margin-top: 20px;
    color: var(--text-muted);
    font-size: 0.8em;
}

/* ===== STATS ROW (Dashboard) ===== */
.stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 22px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.stat-card .stat-label {
    font-size: 0.78em;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.stat-card .stat-value {
    font-size: 1.8em;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-card .stat-value.accent { color: var(--accent); }
.stat-card .stat-value.success { color: var(--success); }

/* ===== CYBER DECORATION ===== */
.cyber-grid {
    position: fixed;
    top: 0;
    left: 240px;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(226, 200, 75, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(226, 200, 75, 0.02) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
    .sidebar {
        width: 64px;
        padding: 20px 8px;
    }
    .sidebar .brand-text,
    .sidebar-username,
    .sidebar-role,
    .sidebar-nav a span:not(.nav-icon) { display: none; }
    .sidebar-nav a { justify-content: center; padding: 11px; }
    .sidebar-avatar { width: 40px; height: 40px; font-size: 16px; }
    .main-content { margin-left: 64px; padding: 24px 20px; }
    .cyber-grid { left: 64px; }
    .stats-row { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
    .challenge-grid { grid-template-columns: 1fr; }
    .two-col { flex-direction: column; }
    .top-bar { flex-direction: column; gap: 16px; align-items: flex-start; }
}