/* =====================================================================
   HALAMAN "BUKU GRATIS" - buku-gratis.php
   =====================================================================
   Halaman berdiri sendiri (tanpa header/footer situs), meniru pola
   tentangkami3.php: nav sendiri, section per bagian, animasi fade-in
   saat scroll dipasang lewat JS di buku-gratis.php.
   ===================================================================== */

:root {
    --navy: #16213E;
    --blue: #2F6FED;
    --blue-dark: #1D4ED8;
    --gold: #C89B3C;
    --gray-900: #1F2937;
    --gray-600: #4B5563;
    --gray-400: #9CA3AF;
    --bg-alt: #F5F7FB;
    --white: #FFFFFF;
    --border: #E5E7EB;
}

* { box-sizing: border-box; }

/* Sebagian browser HP suka "membesarkan sendiri" tulisan yang
   dianggap kekecilan, dengan rumus beda-beda tiap merek HP - inilah
   yang bikin 1 halaman bisa kelihatan beda ukuran di HP berbeda
   walau CSS-nya sama persis. Baris ini mematikan kebiasaan itu,
   supaya ukuran yang kita tentukan di file ini yang selalu dipakai. */
html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    margin: 0;
    font-family: 'Onest', sans-serif;
    color: var(--gray-900);
    background: var(--white);
    line-height: 1.6;
}

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

a { color: inherit; }

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Fokus keyboard tetap kelihatan (aksesibilitas) */
a:focus-visible, button:focus-visible {
    outline: 3px solid var(--blue);
    outline-offset: 3px;
}

/* ====== NAV ====== */
nav {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
}

.nav-container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo { height: 36px; }

.nav-links {
    list-style: none;
    display: flex;
    gap: 32px;
    margin: 0;
    padding: 0;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--navy);
}

.nav-links a.nav-beranda {
    color: var(--blue);
}

.mobile-menu {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}

.mobile-menu span {
    width: 24px;
    height: 2px;
    background: var(--navy);
}

/* ====== HERO ====== */
.hero {
    padding: 56px 0;
    background: linear-gradient(180deg, var(--bg-alt) 0%, var(--white) 100%);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
}

.hero h1 {
    font-size: 2.75rem;
    line-height: 1.15;
    margin: 0 0 20px;
    color: var(--navy);
    font-weight: 800;
    max-width: 15ch;
}

.hero p {
    font-size: 1.1rem;
    color: var(--gray-600);
    max-width: 46ch;
    margin: 0 0 32px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--blue) 0%, var(--blue-dark) 100%);
    color: var(--white);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.05rem;
    padding: 16px 32px;
    border-radius: 999px;
    border: none;
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(47, 111, 237, 0.3);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(47, 111, 237, 0.38);
}

/* Kipasan cover buku di hero - divisualisasikan dari buku aslinya,
   bukan dekorasi abstrak. */
.hero-covers {
    position: relative;
    height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-covers img {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 132px;
    /* margin negatif = setengah lebar & perkiraan setengah tinggi cover,
       supaya TITIK TENGAH gambar pas di titik tengah container dulu -
       baru habis itu digeser ke kanan/kiri lewat transform per gambar
       di bawah. Sebelumnya tanpa ini, posisi awal tiap gambar tidak
       konsisten, jadi salah satu cover (Psikologi Uang) rawan
       ketutupan/tidak kelihatan sama sekali. */
    margin: -99px 0 0 -66px;
    border-radius: 6px;
    box-shadow: 0 16px 32px rgba(22, 33, 62, 0.25);
    border: 3px solid var(--white);
}

.hero-covers img:nth-of-type(1) { transform: translateX(-108px) rotate(-12deg); z-index: 1; }
.hero-covers img:nth-of-type(2) { transform: translateX(-36px) rotate(-4deg); z-index: 2; }
.hero-covers img:nth-of-type(3) { transform: translateX(36px) rotate(4deg); z-index: 3; }
.hero-covers img:nth-of-type(4) { transform: translateX(108px) rotate(12deg); z-index: 4; }

.hero-badge {
    position: absolute;
    top: -14px;
    right: calc(50% - 150px);
    background: var(--gold);
    color: var(--white);
    font-weight: 700;
    font-size: 0.8rem;
    padding: 8px 14px;
    border-radius: 999px;
    box-shadow: 0 6px 16px rgba(200, 155, 60, 0.4);
    z-index: 5;
}

/* ====== SECTION HEADER (dipakai ulang tiap bagian) ====== */
.section-header {
    text-align: center;
    max-width: 60ch;
    margin: 0 auto 48px;
}

.section-header h2 {
    font-size: 2rem;
    line-height: 1.25;
    color: var(--navy);
    margin: 0 0 12px;
    font-weight: 800;
}

.section-header p {
    color: var(--gray-600);
    margin: 0;
    font-size: 1.05rem;
}

/* ====== CARA KERJA (langkah bernomor - memang urutan asli) ====== */
.cara-kerja {
    padding: 64px 0;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
}

.step {
    padding: 0 20px;
    border-left: 1px solid var(--border);
}

.step:first-child { border-left: none; }

.step-icon {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--blue);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin: 0 0 16px;
}

.step-num {
    color: var(--blue);
    font-weight: 800;
}

.step h3 {
    font-size: 1.05rem;
    color: var(--navy);
    margin: 0 0 8px;
}

.step p {
    font-size: 0.95rem;
    color: var(--gray-600);
    margin: 0;
}

/* ====== PILIHAN BUKU (gaya daftar bacaan, bukan kartu SaaS) ====== */
.buku-list {
    padding: 64px 0;
    background: var(--bg-alt);
}

.buku-row {
    display: grid;
    grid-template-columns: 96px 1fr;
    gap: 24px;
    align-items: center;
    padding: 28px 0;
    border-bottom: 1px solid var(--border);
}

.buku-row:last-child { border-bottom: none; }

.buku-row img {
    width: 96px;
    border-radius: 4px;
    box-shadow: 0 8px 20px rgba(22, 33, 62, 0.18);
}

.buku-row h3 {
    font-size: 1.2rem;
    color: var(--navy);
    margin: 0 0 4px;
}

.buku-row .penulis {
    font-size: 0.9rem;
    color: var(--blue);
    font-weight: 600;
    margin: 0 0 10px;
}

.buku-row .hook {
    font-size: 1rem;
    color: var(--gray-600);
    margin: 0;
    max-width: 60ch;
}

/* ====== TENTANG MEDIA POSITIF (gaya kartu meniru tentangkami3.php) ====== */
.tentang-mp {
    padding: 64px 0;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.card {
    background: var(--bg-alt);
    border-radius: 10px;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 170px;
    object-fit: cover;
}

.card-content { padding: 20px; }

.card-content h3 {
    font-size: 1.05rem;
    color: var(--navy);
    margin: 0 0 8px;
}

.card-content p {
    font-size: 0.92rem;
    color: var(--gray-600);
    margin: 0;
}

.tentang-cta {
    text-align: center;
    margin-top: 24px;
}

.tentang-cta a {
    color: var(--blue);
    font-weight: 700;
    text-decoration: none;
}

.tentang-cta a:hover { text-decoration: underline; }

/* ====== CTA AKHIR ====== */
.cta-final {
    padding: 56px 0;
    text-align: center;
}

.cta-final h2 {
    font-size: 2.1rem;
    color: var(--navy);
    margin: 0 0 16px;
    font-weight: 800;
}

.cta-final p {
    color: var(--gray-600);
    margin: 0 0 32px;
}

/* ====== BAGIKAN ====== */
.bagikan {
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
}

.bagikan > span {
    font-size: 0.9rem;
    color: var(--gray-900);
}

.share-icons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.icon-share {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    text-decoration: none;
    font-size: 1.15rem;
    border: none;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    box-shadow: 0 4px 12px rgba(22, 33, 62, 0.15);
}

.icon-share:hover { transform: translateY(-3px); }

.icon-wa   { background: #25D366; }
.icon-fb   { background: #1877F2; }
.icon-x    { background: #111827; }
.icon-ig   { background: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888); }
.icon-copy { background: var(--gray-400); }

/* Baris kecil di bawah ikon - dipakai buat pesan status ("Link
   tersalin!", dst). Diberi tinggi minimum biar tidak "loncat" waktu
   teksnya muncul/hilang. */
.share-note {
    min-height: 1.2em;
    font-size: 0.8rem;
    color: var(--gray-400);
    max-width: 44ch;
    text-align: center;
    margin: 0;
}

/* ====== FOOTER (disalin dari tentangkami3.php agar konsisten) ====== */
.tk-footer {
    background: var(--bg-alt);
    padding: 56px 24px 32px;
    color: var(--gray-600);
    border-top: 1px solid var(--border);
}

.tk-footer-inner {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
}

.tk-footer-logo { height: 34px; }

.tk-alamat { font-style: normal; font-size: 0.9rem; line-height: 1.6; }

.tk-alamat strong { display: block; color: var(--navy); margin-bottom: 4px; }

.tk-alamat-baris { display: block; }

.tk-legal a { font-size: 0.85rem; text-decoration: none; color: var(--gray-600); }

.tk-copy { font-size: 0.8rem; color: var(--gray-400); margin: 8px 0 0; }

/* ====== FADE-IN SAAT SCROLL - dihormati hanya kalau pengunjung
   tidak minta pengurangan animasi (prefers-reduced-motion) ====== */
@media (prefers-reduced-motion: no-preference) {
    .fade-in {
        opacity: 0;
        transform: translateY(16px);
        transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .fade-in.visible {
        opacity: 1;
        transform: none;
    }
}

/* ====== RESPONSIF ====== */
@media (max-width: 860px) {
    .hero-grid { grid-template-columns: 1fr; }
    .hero-covers { margin-top: 24px; }
    .steps-grid { grid-template-columns: repeat(2, 1fr); row-gap: 32px; }
    .step:nth-child(3) { border-left: none; }
    .buku-row { grid-template-columns: 76px 1fr; }
    .cards-grid { grid-template-columns: 1fr; }
    .tentang-mp { padding: 48px 0; }
    .cta-final { padding: 48px 0; }
    .tentang-cta { margin-top: 18px; }
}

@media (max-width: 600px) {
    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        gap: 0;
        border-bottom: 1px solid var(--border);
        display: none;
    }
    .nav-links.terbuka { display: flex; }
    .nav-links li { width: 100%; text-align: center; padding: 14px 0; border-top: 1px solid var(--border); }
    .mobile-menu { display: flex; }
    .hero h1 { font-size: 2.1rem; max-width: none; }
    .section-header h2 { font-size: 1.6rem; }
    .steps-grid { grid-template-columns: 1fr; }
    .step { border-left: none !important; border-top: 1px solid var(--border); padding: 24px 0 0; }
    .step:first-child { border-top: none; padding-top: 0; }
    .hero-covers img { width: 100px; }
    .hero-badge { right: calc(50% - 110px); }

    /* Jarak antar section di HP dibuat lebih rapat dari desktop, tapi
       tetap ada nafas - supaya tidak terasa jauh maupun sempit. */
    .hero { padding: 40px 0 16px; }
    .hero-covers { height: 210px; margin-top: 16px; }
    .cara-kerja { padding: 8px 0 40px; }
    .buku-list, .tentang-mp { padding: 40px 0; }
    .cta-final { padding: 36px 0; }
    .section-header { margin-bottom: 32px; }
    .tentang-cta { margin-top: 14px; }
}