/* ==========================================================================
   1. VARIABEL TEMA & AUTO DARK MODE PREFERENCE
   ========================================================================== */
:root {
    /* MODE TERANG (LIGHT MODE) DEFAULT */
    --bg-color: #f8fafc;         /* Slate 50 - Latar belakang body bersih */
    --bg-alt: #f1f5f9;           /* Slate 100 - Latar komponen/input */
    --card-bg: #ffffff;          /* Putih bersih untuk header & kartu */
    --text-color: #0f172a;       /* Slate 900 - Teks utama pekat */
    --text-muted: #64748b;       /* Slate 500 - Teks sekunder/keterangan */
    --primary: #0284c7;          /* Biru Profesional (Akan ditimpa oleh warna Spreadsheet) */
    --primary-hover: #0369a1;    /* Biru gelap saat di-hover */
    --border-color: #e2e8f0;     /* Slate 200 - Garis batas tipis modern */
    --shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
    :root {
        /* MODE GELAP (DARK MODE) OTOMATIS */
        --bg-color: #0f172a;     /* Slate 900 - Latar belakang body gelap */
        --bg-alt: #1e293b;       /* Slate 800 - Latar komponen/input gelap */
        --card-bg: #1e293b;      /* Slate 800 - Header & kartu mengikuti boks */
        --text-color: #f8fafc;   /* Slate 50 - Teks terang kontras tinggi */
        --text-muted: #94a3b8;   /* Slate 400 - Teks sekunder terang */
        --border-color: #334155;  /* Slate 700 - Garis batas gelap tipis */
        --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
    }
}

/* ==========================================================================
   2. RESET STYLES & RESET DASAR
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    scroll-behavior: smooth;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    color: inherit;
    text-decoration: none;
}

/* ==========================================================================
   3. HEADER UTAMA FIXED & PUSAT PENCARIAN
   ========================================================================== */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    z-index: 1000;
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.header-container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

/* SISI KIRI: Identitas Brand */
.brand-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    flex-shrink: 0;
}

.logo-circle {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background-color: var(--bg-alt);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
}

.logo-circle img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.nama-sekolah {
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: -0.3px;
    white-space: nowrap;
}

/* SISI TENGAH: Pusat Search Bar Global */
.search-center-wrapper {
    flex: 1;
    max-width: 600px;
    margin: 0 auto;
}

.search-input-box {
    position: relative;
    width: 100%;
    display: flex;
    align-items: center;
}

.icon-search {
    position: absolute;
    left: 16px;
    font-size: 0.95rem;
    color: var(--text-muted);
    pointer-events: none;
}

#global-search-bar {
    width: 100%;
    padding: 10px 44px 10px 44px;
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--text-color);
    background-color: var(--bg-alt);
    border: 1.5px solid var(--border-color);
    border-radius: 20px; /* Membuat lonjong minimalis modern */
    outline: none;
    transition: var(--transition);
}

#global-search-bar:focus {
    background-color: var(--card-bg);
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(2, 132, 199, 0.15);
}

.btn-clear {
    position: absolute;
    right: 14px;
    background: none;
    border: none;
    font-size: 1.4rem;
    color: var(--text-muted);
    cursor: pointer;
    line-height: 1;
}

.btn-clear:hover {
    color: var(--text-color);
}

/* SISI KANAN: Hamburger Menu (3 Garis Animasi Menjadi X) */
.hamburger-menu {
    width: 30px;
    height: 22px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1100;
    flex-shrink: 0;
}

.hamburger-menu span {
    width: 100%;
    height: 2.5px;
    background-color: var(--text-color);
    border-radius: 2px;
    transition: var(--transition);
    transform-origin: left center;
}

/* Trik Animasi CSS merubah 3 Garis menjadi Tanda × */
.hamburger-menu.active span:nth-child(1) {
    transform: rotate(45deg) translateY(-2px);
}

.hamburger-menu.active span:nth-child(2) {
    width: 0%;
    opacity: 0;
}

.hamburger-menu.active span:nth-child(3) {
    transform: rotate(-45deg) translateY(2px);
}

/* ==========================================================================
   4. SIDEBAR MENU NAVIGASI (MELAYANG DARI KANAN)
   ========================================================================== */
.sidebar-nav {
    position: fixed;
    top: 0;
    right: -300px; /* Sembunyikan di luar layar bawaan */
    width: 300px;
    height: 100vh;
    background-color: var(--card-bg);
    border-left: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    padding: 90px 24px 30px 24px;
    z-index: 999;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-nav.open {
    transform: translateX(-300px); /* Geser masuk ke layar */
}

.sidebar-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 18px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 1rem;
    color: var(--text-muted);
    transition: var(--transition);
}

.menu-item i {
    font-size: 1.15rem;
}

.menu-item:hover, .menu-item.active-menu {
    color: var(--primary);
    background-color: var(--bg-alt);
    font-weight: 600;
}

/* ==========================================================================
   5. KONTAINER UTAMA ROUTER SPA & UTAN UTAS LOADING
   ========================================================================== */
#content-router {
    margin-top: 70px; /* Sesuai dengan tinggi header fixed */
    min-height: calc(100vh - 140px);
    width: 100%;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
    padding: 40px 24px;
}

.loading-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 0;
    color: var(--text-muted);
    gap: 16px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3.5px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ==========================================================================
   6. SUPER FLEX-GRID ALA GOOGLE IMAGES (DESKTOP MODE PREMIUM)
   ========================================================================== */
.google-flex-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    width: 100%;
}

.google-flex-grid .grid-card {
    flex-grow: 1;
    position: relative;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    height: 280px; /* Tinggi baris horizontal terkunci rapi */
    min-width: 250px;
    display: flex;
    flex-direction: column;
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    cursor: pointer;
}

.google-flex-grid .grid-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 12px 20px -5px rgba(0,0,0,0.15);
}

/* Mengatur wadah visual agar rasio gambar fleksibel tanpa gepeng */
.google-flex-grid .card-visual {
    width: 100%;
    height: 70%; /* Mayoritas porsi kartu untuk visual gambar */
    overflow: hidden;
    background-color: var(--bg-alt);
}

.google-flex-grid .card-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.google-flex-grid .grid-card:hover .card-visual img {
    transform: scale(1.04);
}

/* Detail teks keterangan di bagian bawah kartu */
.google-flex-grid .card-details {
    padding: 14px 16px;
    height: 30%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    background: var(--card-bg);
}

.google-flex-grid .card-details h3 {
    font-size: 1rem;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis; /* Memotong teks berlebih menjadi titik-titik (...) */
    color: var(--text-color);
}

.google-flex-grid .card-details p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ==========================================================================
   7. FOOTER UTAMA
   ========================================================================== */
.main-footer {
    height: 70px;
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 24px;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

/* ==========================================================================
   8. MEDIA QUERIES RESPONSIVE MOBILE VIEW
   ========================================================================== */
@media (max-width: 768px) {
    /* Penyesuaian Ruang Header HP */
    .nama-sekolah {
        display: none; /* Sembunyikan nama sekolah di HP agar tidak menabrak Search bar */
    }
    
    .header-container {
        padding: 0 16px;
    }

    .search-center-wrapper {
        max-width: 100%;
    }

    #global-search-bar {
        padding: 8px 36px 8px 36px;
        font-size: 0.9rem;
    }

    .icon-search {
        left: 12px;
    }

    .btn-clear {
        right: 12px;
    }

    /* RUNTUH MENJADI VERTIKAL: Memaksa Google Flex-Grid menjadi List Kolom Tegak Lurus di HP */
    .google-flex-grid {
        flex-direction: column;
    }

    .google-flex-grid .grid-card {
        width: 100% !important;
        height: auto; /* Biarkan tinggi menyesuaikan otomatis di HP */
    }

    .google-flex-grid .card-visual {
        height: 200px; /* Kunci tinggi gambar statis di HP agar proporsional */
    }

    .google-flex-grid .card-details {
        height: auto;
        padding: 16px;
    }
    
    .google-flex-grid .card-details h3,
    .google-flex-grid .card-details p {
        white-space: normal; /* Mengembalikan teks agar membungkus ke bawah jika panjang di HP */
        text-overflow: clip;
    }
  }