/* =====================================================================
   Layout — header, sidebar, main, login
   ===================================================================== */

/* ===== Header ===== */
.header {
    background: var(--color-canvas);
    color: var(--color-on-dark);
    padding: 0 var(--space-lg);
    height: var(--header-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    border-bottom: 1px solid var(--color-hairline);
}

.header .logo {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.2px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-on-dark);
}

.header .logo .logo-icon {
    width: 32px;
    height: 32px;
    background: var(--color-primary);
    color: var(--color-on-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 800;
    font-family: var(--font-display);
}

.header .user-area {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: var(--t-body-sm);
    color: var(--color-muted);
}

.header .user-area #header-username {
    color: var(--color-on-dark);
    font-weight: 600;
}

.header .user-area a {
    color: var(--color-muted);
    cursor: pointer;
    transition: color 0.15s ease;
    font-weight: 500;
}

.header .user-area a:hover { color: var(--color-primary); }

/* ===== Sidebar ===== */
.sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--color-canvas);
    border-right: 1px solid var(--color-hairline);
    padding: var(--space-md) 0;
    overflow-y: auto;
    z-index: 90;
}

.sidebar .nav-group { margin-bottom: var(--space-md); }

.sidebar .nav-group-title {
    padding: var(--space-xs) var(--space-md);
    font-size: 11px;
    color: var(--color-muted);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    font-weight: 600;
    margin-bottom: 2px;
}

.sidebar .nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 9px var(--space-md);
    margin: 1px var(--space-xs);
    border-radius: var(--radius-md);
    color: var(--color-muted-strong);
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
    font-size: var(--t-nav);
    font-weight: 500;
    border-left: 2px solid transparent;
    user-select: none;
}

.sidebar .nav-item:hover {
    background: var(--color-surface);
    color: var(--color-on-dark);
}

.sidebar .nav-item.active {
    background: var(--color-surface);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
    font-weight: 600;
}

.sidebar .nav-item .nav-icon {
    width: 18px;
    text-align: center;
    font-size: 15px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    opacity: 0.95;
}

/* ===== Main Content ===== */
.main-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--header-height);
    padding: var(--space-lg);
    min-height: calc(100vh - var(--header-height));
}

/* ===== Page Container ===== */
.page-container {
    max-width: var(--content-max);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.page-container > .stats-grid,
.page-container > [style*="display:grid"] {
    margin-bottom: 0;
}

/* ===== Login Layout ===== */
.login-overlay {
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse at top, rgba(252, 213, 53, 0.06), transparent 60%),
        var(--color-canvas);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: var(--space-lg);
}

.login-box {
    background: var(--color-surface);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-xl);
    padding: 40px 36px;
    width: 400px;
    max-width: 100%;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.login-box::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-primary);
}

.login-box h2 {
    text-align: center;
    margin-bottom: 6px;
    color: var(--color-on-dark);
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.2px;
    font-family: var(--font-display);
}

.login-box .login-subtitle {
    text-align: center;
    color: var(--color-muted);
    font-size: var(--t-body-sm);
    margin-bottom: var(--space-lg);
}

.login-box #login-mode-setup a {
    color: var(--color-primary);
    font-weight: 500;
    transition: color 0.15s ease;
}
.login-box #login-mode-setup a:hover { color: var(--color-primary-hover); }

/* ===== Captcha (Login / Setup) ===== */
.captcha-group {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.captcha-group .form-input.captcha-input {
    flex: 1;
    width: auto;
    min-width: 0;
}

.captcha-group .captcha-img {
    width: 120px;
    height: 40px;
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-md);
    cursor: pointer;
    background: var(--color-surface-2);
    transition: border-color 0.15s ease, opacity 0.15s ease;
    user-select: none;
    -webkit-user-drag: none;
    padding: 2px;
}

.captcha-group .captcha-img:hover {
    border-color: var(--color-primary);
    opacity: 0.92;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    :root { --sidebar-width: 64px; }
    .sidebar .nav-group-title { display: none; }
    .sidebar .nav-item {
        justify-content: center;
        padding: 10px;
    }
    .sidebar .nav-item { border-left: 0; }
    .sidebar .nav-item.active { border-left: 0; }
    .sidebar .nav-item .nav-icon { margin: 0; }
    .header .logo { font-size: 0; }
    .header .logo .logo-icon { margin: 0; }
}

@media (max-width: 768px) {
    :root { --sidebar-width: 0px; }
    .sidebar { display: none; }
    .main-content { margin-left: 0; padding: var(--space-md); }
}