/* =========================================================
   SARPRAS PERPUSTAKAAN - MAIN STYLESHEET
   Tema: gradasi biru modern
   ========================================================= */

:root {
    --biru-900: #0b1c4a;
    --biru-800: #102a63;
    --biru-700: #14328a;
    --biru-600: #1d4ed8;
    --biru-500: #2563eb;
    --biru-400: #3b82f6;
    --biru-300: #93c5fd;
    --biru-100: #eaf1ff;

    --abu-900: #1e293b;
    --abu-700: #475569;
    --abu-500: #64748b;
    --abu-300: #cbd5e1;
    --abu-100: #f1f5f9;

    --hijau: #16a34a;
    --merah: #dc2626;
    --kuning: #d97706;

    --radius-lg: 18px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --shadow-card: 0 10px 30px rgba(11, 28, 74, 0.12);
    --font-utama: 'Segoe UI', 'Inter', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: var(--font-utama);
    color: var(--abu-900);
    background: var(--abu-100);
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; margin: 0; padding: 0; }

/* =========================================================
   HALAMAN LOGIN
   ========================================================= */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--biru-900) 0%, var(--biru-700) 45%, var(--biru-500) 100%);
    padding: 24px;
}

.login-page::before {
    content: '';
    position: absolute;
    top: -120px;
    left: -120px;
    width: 380px;
    height: 380px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
}

.login-page::after {
    content: '';
    position: absolute;
    bottom: -160px;
    right: -100px;
    width: 460px;
    height: 460px;
    border-radius: 50%;
    background: rgba(59, 130, 246, 0.25);
    filter: blur(10px);
}

.login-card {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 400px;
    background: #ffffff;
    border-radius: var(--radius-lg);
    box-shadow: 0 25px 60px rgba(0,0,0,0.35);
    padding: 40px 36px 28px;
    text-align: center;
}

.login-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 18px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--biru-600), var(--biru-400));
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.35);
}
.login-icon svg { width: 30px; height: 30px; fill: #fff; }

.login-card h1 {
    font-size: 22px;
    margin: 0 0 4px;
    color: var(--abu-900);
}
.login-card .subtitle {
    font-size: 13.5px;
    color: var(--biru-600);
    margin: 0 0 24px;
}
.login-card .subtitle b { font-weight: 600; }

.form-group { position: relative; margin-bottom: 16px; text-align: left; }
.form-group .icon-kiri {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--biru-600);
    font-size: 15px;
    pointer-events: none;
}
.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="email"] {
    width: 100%;
    padding: 12px 14px 12px 40px;
    border: 1.5px solid var(--abu-300);
    border-radius: var(--radius-sm);
    font-size: 14px;
    outline: none;
    transition: border-color .2s, box-shadow .2s;
    background: #fff;
}
.form-group input:focus {
    border-color: var(--biru-500);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
}
.toggle-password {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: var(--abu-500);
    background: none;
    border: none;
    font-size: 15px;
}

.btn-login {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--biru-600), var(--biru-500));
    color: #fff;
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(37,99,235,0.3);
    transition: transform .15s, box-shadow .15s;
}
.btn-login:hover { transform: translateY(-1px); box-shadow: 0 14px 24px rgba(37,99,235,0.38); }
.btn-login:active { transform: translateY(0); }

.login-divider {
    border: none;
    border-top: 1px solid var(--abu-300);
    margin: 22px 0 12px;
}
.login-footnote { font-size: 12px; color: var(--abu-500); margin: 0; }
.login-copyright {
    position: relative;
    z-index: 2;
    margin-top: 18px;
    text-align: center;
    font-size: 12.5px;
    color: rgba(255,255,255,0.85);
}
.login-copyright b { color: #fff; }

.alert {
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    margin-bottom: 16px;
    text-align: left;
}
.alert-error { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }
.alert-success { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.alert-warning { background: #fef3c7; color: #92400e; border: 1px solid #fde68a; }

/* =========================================================
   LAYOUT APLIKASI (DASHBOARD)
   ========================================================= */
.app-wrapper { display: flex; min-height: 100vh; }

.sidebar {
    width: 260px;
    flex-shrink: 0;
    background: linear-gradient(180deg, var(--biru-900), var(--biru-700));
    color: #fff;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; bottom: 0; left: 0;
    z-index: 100;
    transition: transform .25s ease;
}
.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    height: 68px;
    padding: 0 20px;
    flex-shrink: 0;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.sidebar-brand .logo-box {
    width: 38px; height: 38px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--biru-400), var(--biru-300));
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.sidebar-brand .logo-box svg { width: 20px; height: 20px; color: var(--biru-900); }
.sidebar-brand .brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.sidebar-brand .brand-title { font-weight: 700; font-size: 15px; color: #fff; }
.sidebar-brand .brand-subtitle { font-size: 11px; color: rgba(255,255,255,0.6); }

.sidebar-menu {
    flex: 1;
    overflow-y: auto;
    padding: 14px 12px;
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.25) transparent;
}
.sidebar-menu::-webkit-scrollbar { width: 6px; }
.sidebar-menu::-webkit-scrollbar-track { background: transparent; }
.sidebar-menu::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.2);
    border-radius: 10px;
}
.sidebar-menu::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.35); }
.sidebar-menu .menu-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: rgba(255,255,255,0.45);
    padding: 14px 10px 6px;
}
.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: rgba(255,255,255,0.85);
    margin-bottom: 2px;
    transition: background .15s;
}
.sidebar-menu a:hover { background: rgba(255,255,255,0.08); }
.sidebar-menu a.active { background: rgba(255,255,255,0.16); color: #fff; font-weight: 600; }
.sidebar-menu a .ic { width: 18px; text-align: center; }

.sidebar-footer {
    padding: 14px 20px;
    border-top: 1px solid rgba(255,255,255,0.08);
    font-size: 12px;
    color: rgba(255,255,255,0.6);
}

.main-content { margin-left: 260px; flex: 1; min-width: 0; }

.topbar {
    background: #fff;
    height: 68px;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
    position: sticky;
    top: 0;
    z-index: 50;
}
.topbar .judul-halaman { font-size: 17px; font-weight: 700; color: var(--abu-900); }
.topbar .user-info { display: flex; align-items: center; gap: 14px; }
.topbar .avatar {
    width: 36px; height: 36px; border-radius: 50%;
    background: linear-gradient(135deg, var(--biru-600), var(--biru-400));
    color: #fff; display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 14px;
    border: none; cursor: pointer;
    transition: box-shadow .15s;
}
.topbar .avatar:hover { box-shadow: 0 0 0 3px rgba(37,99,235,0.18); }

.user-dropdown { position: relative; }
.user-dropdown-menu {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 10px);
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: 0 15px 35px rgba(11,28,74,0.18);
    min-width: 210px;
    overflow: hidden;
    z-index: 200;
    border: 1px solid var(--abu-100);
}
.user-dropdown-menu.show { display: block; }
.user-dropdown-header {
    padding: 14px 16px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    background: var(--abu-100);
    border-bottom: 1px solid var(--abu-300);
}
.user-dropdown-header strong { font-size: 13.5px; color: var(--abu-900); }
.user-dropdown-header span { font-size: 12px; color: var(--abu-500); }
.user-dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 11px 16px;
    font-size: 13.5px;
    color: var(--abu-700);
    transition: background .15s;
}
.user-dropdown-menu a:hover { background: var(--biru-100); color: var(--biru-700); }
.topbar .role-tag {
    font-size: 11px;
    background: var(--biru-100);
    color: var(--biru-700);
    padding: 2px 8px;
    border-radius: 20px;
    font-weight: 600;
}
.btn-hamburger {
    display: none;
    background: none; border: none; font-size: 20px; cursor: pointer; color: var(--abu-900);
}

.content-area { padding: 24px; min-height: calc(100vh - 68px - 58px); }

.page-footer {
    text-align: center;
    font-size: 12.5px;
    color: var(--abu-500);
    padding: 18px 24px;
    border-top: 1px solid var(--abu-300);
    background: #fff;
}
.page-footer b { color: var(--abu-700); }

/* Cards */
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-bottom: 24px; }
.stat-card {
    background: #fff;
    border-radius: var(--radius-md);
    padding: 20px;
    box-shadow: var(--shadow-card);
    display: flex;
    align-items: center;
    gap: 14px;
}
.stat-card .icon-box {
    width: 46px; height: 46px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 20px; color: #fff; flex-shrink: 0;
}
.stat-card .icon-box.biru { background: linear-gradient(135deg, var(--biru-600), var(--biru-400)); }
.stat-card .icon-box.hijau { background: linear-gradient(135deg, #16a34a, #4ade80); }
.stat-card .icon-box.kuning { background: linear-gradient(135deg, #d97706, #fbbf24); }
.stat-card .icon-box.merah { background: linear-gradient(135deg, #dc2626, #f87171); }
.stat-card .angka { font-size: 22px; font-weight: 700; color: var(--abu-900); }
.stat-card .label { font-size: 12.5px; color: var(--abu-500); }

.card {
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    padding: 22px;
    margin-bottom: 22px;
}
.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 10px;
}
.card-header h3 { margin: 0; font-size: 16px; color: var(--abu-900); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 16px;
    border-radius: var(--radius-sm);
    font-size: 13.5px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: transform .12s, opacity .12s;
}
.btn:hover { opacity: 0.92; }
.btn-primary { background: linear-gradient(135deg, var(--biru-600), var(--biru-500)); color: #fff; }
.btn-success { background: linear-gradient(135deg, #16a34a, #4ade80); color: #fff; }
.btn-danger { background: linear-gradient(135deg, #dc2626, #f87171); color: #fff; }
.btn-secondary { background: var(--abu-100); color: var(--abu-700); }
.btn-sm { padding: 6px 10px; font-size: 12.5px; }

/* Forms */
.form-label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 6px; color: var(--abu-700); }
.form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1.5px solid var(--abu-300);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: inherit;
    outline: none;
}
.form-control:focus { border-color: var(--biru-500); box-shadow: 0 0 0 3px rgba(37,99,235,0.1); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.form-group-full { margin-bottom: 16px; }

/* Tables */
.table-wrap { overflow-x: auto; }
table.data-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.data-table th {
    text-align: left;
    background: var(--abu-100);
    color: var(--abu-700);
    padding: 10px 12px;
    font-weight: 600;
    white-space: nowrap;
}
table.data-table td { padding: 10px 12px; border-bottom: 1px solid var(--abu-100); vertical-align: middle; }
table.data-table tr:hover td { background: #f8fafc; }

/* Badges */
.badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 12px; font-weight: 600; }
.badge-blue { background: #dbeafe; color: #1d4ed8; }
.badge-green { background: #dcfce7; color: #15803d; }
.badge-red { background: #fee2e2; color: #b91c1c; }
.badge-gray { background: #f1f5f9; color: #475569; }
.badge-yellow { background: #fef3c7; color: #92400e; }

/* Book grid (katalog) */
.book-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px,1fr)); gap: 18px; }
.book-item {
    background: #fff; border-radius: var(--radius-md); overflow: hidden;
    box-shadow: var(--shadow-card); display: flex; flex-direction: column;
}
.book-cover {
    height: 150px;
    background: linear-gradient(135deg, var(--biru-600), var(--biru-400));
    display: flex; align-items: center; justify-content: center; color: #fff; font-size: 34px;
}
.book-info { padding: 12px; flex: 1; display: flex; flex-direction: column; gap: 4px; }
.book-info .judul { font-size: 13.5px; font-weight: 700; color: var(--abu-900); line-height: 1.3; }
.book-info .penulis { font-size: 12px; color: var(--abu-500); }
.book-info .stok { font-size: 12px; margin-top: auto; }

/* Responsive */
@media (max-width: 992px) {
    .stat-grid { grid-template-columns: repeat(2, 1fr); }
    .form-row { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.show { transform: translateX(0); }
    .main-content { margin-left: 0; }
    .btn-hamburger { display: block; }
    .stat-grid { grid-template-columns: 1fr; }
    .content-area { padding: 16px; }
}