/* ── CSS Custom Properties ─────────────────── */
:root {
    --color-bg:          #0d0d1a;
    --color-surface:     #16162a;
    --color-surface-2:   #1e1e38;
    --color-border:      #2a2a4a;
    --color-primary:     #6366f1;
    --color-primary-h:   #5254cc;
    --color-accent:      #22d3ee;
    --color-success:     #10b981;
    --color-warning:     #f59e0b;
    --color-danger:      #ef4444;
    --color-text:        #e2e8f0;
    --color-text-muted:  #94a3b8;
    --radius:            10px;
    --radius-lg:         16px;
    --shadow:            0 4px 24px rgba(0, 0, 0, 0.4);
    --transition:        0.2s ease;
}

/* ── Reset ──────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    min-height: 100vh;
}

a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent); }

img { display: block; max-width: 100%; }

/* ── Typography ─────────────────────────────── */
h1 { font-size: 2rem; font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: 1.5rem; font-weight: 600; }
h3 { font-size: 1.125rem; font-weight: 600; }
p  { color: var(--color-text-muted); }

/* ── Buttons ────────────────────────────────── */
.btn-primary {
    display: inline-block;
    padding: 0.625rem 1.5rem;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
    text-align: center;
}
.btn-primary:hover  { background: var(--color-primary-h); color: #fff; transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
    display: inline-block;
    padding: 0.625rem 1.5rem;
    background: transparent;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: border-color var(--transition), color var(--transition);
    text-align: center;
}
.btn-secondary:hover { border-color: var(--color-primary); color: var(--color-primary); }

.btn-block { display: block; width: 100%; }

/* ── Navbar ─────────────────────────────────── */
.navbar {
    display: flex;
    align-items: center;
    gap: 2rem;
    padding: 0 2rem;
    height: 60px;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-brand a {
    font-size: 1.25rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.navbar-menu { display: flex; gap: 1.5rem; flex: 1; }

.navbar-menu a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.25rem 0;
    border-bottom: 2px solid transparent;
    transition: color var(--transition), border-color var(--transition);
}
.navbar-menu a:hover,
.navbar-menu a.active { color: var(--color-text); border-bottom-color: var(--color-primary); }

.navbar-right { display: flex; align-items: center; gap: 1rem; }

.navbar-user { font-size: 0.875rem; color: var(--color-text-muted); }

.btn-logout {
    padding: 0.375rem 0.875rem;
    background: transparent;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.8rem;
    cursor: pointer;
    transition: border-color var(--transition), color var(--transition);
}
.btn-logout:hover { border-color: var(--color-danger); color: var(--color-danger); }

/* ── Page Layout ────────────────────────────── */
.page-content { max-width: 1100px; margin: 0 auto; padding: 2.5rem 1.5rem; }

/* ── Alerts ─────────────────────────────────── */
.alert {
    padding: 0.875rem 1.25rem;
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}
.alert-info    { background: rgba(99, 102, 241, 0.12); border: 1px solid rgba(99, 102, 241, 0.3); color: #a5b4fc; }
.alert-success { background: rgba(16, 185, 129, 0.12); border: 1px solid rgba(16, 185, 129, 0.3); color: #6ee7b7; }

/* ── Utility ────────────────────────────────── */
.hidden { display: none !important; }

/* ── Responsive ─────────────────────────────── */
@media (max-width: 768px) {
    .navbar { padding: 0 1rem; gap: 1rem; }
    .navbar-menu { gap: 1rem; }
    .page-content { padding: 1.5rem 1rem; }
    h1 { font-size: 1.5rem; }
}