/* ============================================
   STYLE.CSS - Kalkulator Mahasiswa
   Pendekatan: Mobile-first, warna kalem, ringan
   ============================================ */

/* --- RESET DASAR --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* --- VARIABEL WARNA (mudah diganti) --- */
:root {
    --warna-utama: #2c6e49;       /* Hijau kalem */
    --warna-utama-tua: #1e4d34;
    --warna-aksen: #4c956c;
    --warna-latar: #f7f9f7;
    --warna-kartu: #ffffff;
    --warna-teks: #2d3436;
    --warna-teks-redup: #636e72;
    --warna-batas: #dfe6e9;
    --warna-error: #c0392b;
    --warna-sukses: #27ae60;
    --radius: 10px;
    --bayangan: 0 2px 8px rgba(0, 0, 0, 0.06);
}

/* --- FONT SISTEM (tidak memuat font eksternal) --- */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: 16px;            /* Minimal 16px agar nyaman di HP */
    line-height: 1.6;
    color: var(--warna-teks);
    background-color: var(--warna-latar);
    -webkit-text-size-adjust: 100%;
}

/* --- CONTAINER (lebar maksimum + padding samping) --- */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 16px;
}

/* --- HEADER --- */
.site-header {
    background-color: var(--warna-kartu);
    border-bottom: 1px solid var(--warna-batas);
    padding: 14px 0;
    position: sticky;
    top: 0;
    z-index: 10;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.logo {
    font-weight: 700;
    font-size: 18px;
    color: var(--warna-utama-tua);
    text-decoration: none;
}

.main-nav {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.main-nav a {
    color: var(--warna-teks);
    text-decoration: none;
    font-size: 15px;
    padding: 6px 2px;
}

.main-nav a:hover {
    color: var(--warna-utama);
}

/* --- HERO (beranda) --- */
.hero {
    text-align: center;
    padding: 32px 0 24px;
}

.hero h1 {
    font-size: 28px;
    color: var(--warna-utama-tua);
    margin-bottom: 10px;
}

.hero p {
    color: var(--warna-teks-redup);
    max-width: 600px;
    margin: 0 auto;
}

/* --- DAFTAR KALKULATOR --- */
.calc-list {
    padding: 16px 0 32px;
}

.calc-list h2 {
    font-size: 20px;
    margin-bottom: 16px;
    color: var(--warna-utama-tua);
}

.calc-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}

.calc-card {
    background: var(--warna-kartu);
    border: 1px solid var(--warna-batas);
    border-radius: var(--radius);
    padding: 20px;
    text-decoration: none;
    color: var(--warna-teks);
    box-shadow: var(--bayangan);
    transition: transform 0.15s, box-shadow 0.15s;
}

.calc-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.calc-icon {
    font-size: 36px;
    margin-bottom: 8px;
}

.calc-card h3 {
    font-size: 18px;
    color: var(--warna-utama-tua);
    margin-bottom: 6px;
}

.calc-card p {
    color: var(--warna-teks-redup);
    font-size: 15px;
    margin-bottom: 12px;
}

.calc-btn {
    color: var(--warna-utama);
    font-weight: 600;
    font-size: 15px;
}

/* --- HALAMAN KALKULATOR --- */
.page-intro {
    padding: 24px 0 16px;
    text-align: center;
}

.page-intro h1 {
    font-size: 26px;
    color: var(--warna-utama-tua);
    margin-bottom: 8px;
}

.page-intro p {
    color: var(--warna-teks-redup);
    max-width: 600px;
    margin: 0 auto;
}

/* --- KOTAK KALKULATOR --- */
.calculator {
    background: var(--warna-kartu);
    border: 1px solid var(--warna-batas);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--bayangan);
    margin: 16px 0 32px;
}

/* Pilihan Skala */
.scale-selector {
    margin-bottom: 18px;
}

.scale-selector label {
    display: block;
    margin-bottom: 6px;
    font-size: 15px;
}

.scale-selector select {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    border: 1px solid var(--warna-batas);
    border-radius: 8px;
    background: #fff;
    color: var(--warna-teks);
}

/* Header Baris Input */
.input-header {
    display: grid;
    grid-template-columns: 2fr 1fr 1.2fr 40px;
    gap: 8px;
    padding: 8px 4px;
    font-size: 13px;
    font-weight: 600;
    color: var(--warna-teks-redup);
    border-bottom: 1px solid var(--warna-batas);
    margin-bottom: 8px;
}

.col-sks, .col-nilai {
    text-align: center;
}

/* Setiap Baris Mata Kuliah */
.baris-mk {
    display: grid;
    grid-template-columns: 2fr 1fr 1.2fr 40px;
    gap: 8px;
    align-items: center;
    padding: 6px 0;
    border-bottom: 1px dashed var(--warna-batas);
}

.baris-mk input,
.baris-mk select {
    width: 100%;
    padding: 10px 8px;
    font-size: 16px;
    border: 1px solid var(--warna-batas);
    border-radius: 6px;
    background: #fff;
}

.baris-mk input:focus,
.baris-mk select:focus {
    outline: 2px solid var(--warna-aksen);
    outline-offset: 1px;
    border-color: var(--warna-aksen);
}

.baris-mk .col-sks input,
.baris-mk .col-nilai select {
    text-align: center;
}

.tombol-hapus {
    background: transparent;
    border: 1px solid var(--warna-batas);
    border-radius: 6px;
    width: 36px;
    height: 36px;
    font-size: 18px;
    cursor: pointer;
    color: var(--warna-error);
    transition: background 0.15s;
}

.tombol-hapus:hover {
    background: #fdecea;
}

/* Tombol Tambah Baris */
#tambahBaris {
    margin-top: 12px;
    width: 100%;
}

/* Tombol Umum */
.btn {
    padding: 14px 20px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
    font-family: inherit;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--warna-utama);
    color: #fff;
}

.btn-primary:hover {
    background: var(--warna-utama-tua);
}

.btn-secondary {
    background: #fff;
    color: var(--warna-utama);
    border: 1px solid var(--warna-utama);
}

.btn-secondary:hover {
    background: #eef6f1;
}

/* Tombol Aksi (Hitung & Reset) */
.action-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 18px;
}

/* Hasil */
.hasil {
    margin-top: 22px;
    padding: 20px;
    background: linear-gradient(135deg, #eef6f1 0%, #f7f9f7 100%);
    border: 1px solid var(--warna-aksen);
    border-radius: var(--radius);
    text-align: center;
}

.hasil-ipk {
    margin-bottom: 16px;
}

.hasil-label {
    display: block;
    font-size: 14px;
    color: var(--warna-teks-redup);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.hasil-angka {
    display: block;
    font-size: 56px;
    font-weight: 700;
    color: var(--warna-utama-tua);
    line-height: 1;
}

.hasil-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    padding-top: 14px;
    border-top: 1px solid var(--warna-batas);
}

.hasil-item-label {
    display: block;
    font-size: 13px;
    color: var(--warna-teks-redup);
    margin-bottom: 2px;
}

.hasil-item-angka {
    display: block;
    font-size: 22px;
    font-weight: 600;
    color: var(--warna-teks);
}

/* Pesan Error */
.error-msg {
    margin-top: 14px;
    padding: 12px 14px;
    background: #fdecea;
    border: 1px solid #f5b7b1;
    border-radius: 8px;
    color: var(--warna-error);
    font-size: 15px;
}

/* --- KONTEN SEO --- */
.content {
    padding: 16px 0 32px;
}

.content h2 {
    font-size: 22px;
    color: var(--warna-utama-tua);
    margin: 24px 0 10px;
}

.content p, .content li {
    margin-bottom: 10px;
    color: var(--warna-teks);
}

.content ul, .content ol {
    padding-left: 22px;
    margin-bottom: 12px;
}

.rumus {
    background: #eef6f1;
    border-left: 4px solid var(--warna-aksen);
    padding: 14px 16px;
    margin: 12px 0;
    font-family: "Courier New", monospace;
    font-size: 15px;
    border-radius: 6px;
    overflow-x: auto;
}

/* FAQ */
.faq {
    background: var(--warna-kartu);
    border: 1px solid var(--warna-batas);
    border-radius: 8px;
    margin-bottom: 10px;
    overflow: hidden;
}

.faq summary {
    padding: 14px 16px;
    cursor: pointer;
    font-size: 16px;
    list-style: none;
}

.faq summary::-webkit-details-marker {
    display: none;
}

.faq summary::after {
    content: " +";
    color: var(--warna-utama);
    font-weight: 700;
    float: right;
}

.faq[open] summary::after {
    content: " −";
}

.faq p {
    padding: 0 16px 14px;
    color: var(--warna-teks-redup);
    font-size: 15px;
}

/* Peringatan */
.peringatan {
    background: #fff8e1;
    border: 1px solid #f4d03f;
    border-radius: 8px;
    padding: 14px 16px;
    margin-top: 24px;
    font-size: 15px;
    color: #7d6608;
}

/* --- FOOTER --- */
.site-footer {
    background: var(--warna-kartu);
    border-top: 1px solid var(--warna-batas);
    padding: 24px 0;
    margin-top: 32px;
    text-align: center;
}

.footer-nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 12px;
}

.footer-nav a {
    color: var(--warna-teks-redup);
    text-decoration: none;
    font-size: 14px;
}

.footer-nav a:hover {
    color: var(--warna-utama);
}

.copyright {
    font-size: 13px;
    color: var(--warna-teks-redup);
}

/* --- RESPONSIVE (layar lebih besar dari 600px) --- */
@media (min-width: 600px) {
    .hero h1 { font-size: 34px; }
    .page-intro h1 { font-size: 30px; }
    .hasil-angka { font-size: 64px; }
    .calculator { padding: 28px; }
}