/* ==========================================================
   Cipher Buatan Sendiri — marun terang & abu-abu
   ========================================================== */

:root {
    --marun-700: #7a1a34;
    --marun-600: #962544;
    --marun-500: #b0314f;   /* marun utama */
    --marun-400: #c9506b;
    --marun-100: #f3d9df;

    --abu-900: #3a3537;
    --abu-700: #5b5558;
    --abu-500: #8a8487;
    --abu-300: #c9c5c6;
    --abu-200: #dcd9da;
    --abu-100: #eeecec;
    --abu-50:  #f7f6f6;

    --hijau: #2f6b45;
    --merah: #a1232f;
}

*, *::before, *::after { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 2rem 1rem;
    font-family: "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
    line-height: 1.6;
    color: var(--abu-900);
    background:
        radial-gradient(circle at 12% 10%, var(--abu-100) 0 18%, transparent 18.2%),
        radial-gradient(circle at 92% 90%, #b9b4b6 0 22%, transparent 22.2%),
        var(--abu-300);
}

/* ---------- Kartu dua kolom ---------- */
.halaman {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    width: 100%;
    max-width: 980px;
    overflow: hidden;
    border-radius: 20px;
    box-shadow: 0 24px 60px rgba(58, 53, 55, .35);
}

/* ---------- Sisi kiri (marun) ---------- */
.sisi {
    position: relative;
    overflow: hidden;
    padding: 2.75rem 2.25rem;
    color: #fff;
    background: linear-gradient(160deg, var(--marun-500), var(--marun-700));
}

/* deretan hex besar sebagai latar */
.sisi::after {
    content: "A9 3F\A 7C E2\A 1D B0";
    white-space: pre;
    position: absolute;
    right: -.5rem;
    bottom: -1.2rem;
    font: 800 5.2rem/1 ui-monospace, Consolas, "Courier New", monospace;
    text-align: right;
    color: rgba(255, 255, 255, .10);
    pointer-events: none;
}

.sisi h1 {
    margin: 0 0 .6rem;
    font-size: 2.3rem;
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: -.02em;
}

.sisi > p {
    margin: 0 0 2rem;
    max-width: 34ch;
    color: var(--marun-100);
}

.lapisan {
    position: relative;
    z-index: 1;
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: .8rem;
    counter-reset: lapis;
}

.lapisan li {
    counter-increment: lapis;
    display: grid;
    grid-template-columns: 2.2rem 1fr;
    gap: .75rem;
    align-items: start;
    padding: .8rem .9rem;
    background: rgba(255, 255, 255, .12);
    border: 1px solid rgba(255, 255, 255, .22);
    border-radius: 12px;
}

.lapisan li::before {
    content: counter(lapis);
    display: grid;
    place-items: center;
    width: 2.2rem;
    height: 2.2rem;
    font-weight: 800;
    color: var(--marun-700);
    background: #fff;
    border-radius: 50%;
}

.lapisan b { display: block; font-size: 1rem; }
.lapisan span { font-size: .88rem; color: var(--marun-100); }

/* ---------- Sisi kanan (abu-abu) ---------- */
.utama {
    padding: 2.75rem 2.25rem;
    background: var(--abu-50);
}

.utama h2 {
    margin: 0 0 1.25rem;
    font-size: 1.35rem;
    color: var(--abu-900);
}

label {
    display: block;
    margin: 1.1rem 0 .4rem;
    font-size: .9rem;
    font-weight: 600;
    color: var(--abu-700);
}

h2 + form label:first-child { margin-top: 0; }

input[type=text],
textarea {
    width: 100%;
    padding: .75rem .9rem;
    font: inherit;
    color: var(--abu-900);
    background: #fff;
    border: 1.5px solid var(--abu-300);
    border-radius: 10px;
    transition: border-color .15s, box-shadow .15s;
}

textarea { resize: vertical; min-height: 110px; }

input[type=text]:hover,
textarea:hover { border-color: var(--abu-500); }

input[type=text]:focus,
textarea:focus {
    outline: none;
    border-color: var(--marun-500);
    box-shadow: 0 0 0 4px rgba(176, 49, 79, .18);
}

/* ---------- Tombol ---------- */
.aksi {
    display: flex;
    flex-wrap: wrap;
    gap: .7rem;
    margin-top: 1.4rem;
}

button {
    flex: 1 1 140px;
    padding: .8rem 1.1rem;
    font: inherit;
    font-weight: 700;
    color: #fff;
    cursor: pointer;
    border: 0;
    border-radius: 10px;
    transition: background-color .15s, transform .05s;
}

button:active { transform: translateY(1px); }

button:focus-visible {
    outline: 3px solid var(--abu-900);
    outline-offset: 2px;
}

button[value="enkripsi"] { background: var(--marun-500); }
button[value="enkripsi"]:hover { background: var(--marun-600); }

button[value="dekripsi"] { background: var(--abu-700); }
button[value="dekripsi"]:hover { background: var(--abu-900); }

/* ---------- Hasil & error ---------- */
.hasil,
.error {
    margin-top: 1.5rem;
    padding: 1rem 1.15rem;
    border-radius: 12px;
    border-left: 5px solid;
}

.hasil {
    background: #fff;
    border-color: var(--marun-500);
    box-shadow: 0 2px 10px rgba(58, 53, 55, .08);
}

.hasil-kepala {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: .75rem;
    margin-bottom: .6rem;
    font-size: .9rem;
    font-weight: 700;
    color: var(--abu-700);
}

.hasil .salin {
    flex: none;
    padding: .3rem .8rem;
    font-size: .8rem;
    color: var(--marun-600);
    background: var(--marun-100);
    border-radius: 999px;
}
.hasil .salin:hover { background: var(--marun-400); color: #fff; }

.nilai {
    display: flex;
    flex-wrap: wrap;
    gap: .35rem;
    font-family: ui-monospace, "Cascadia Code", Consolas, "Courier New", monospace;
}

.nilai .byte {
    padding: .15rem .5rem;
    font-weight: 700;
    color: var(--marun-700);
    background: var(--abu-100);
    border: 1px solid var(--abu-200);
    border-radius: 6px;
}

.nilai.teks {
    display: block;
    font-size: 1.05rem;
    color: var(--abu-900);
    word-break: break-word;
}

.error {
    color: var(--merah);
    background: #fbe9eb;
    border-color: var(--merah);
}

/* ---------- Layar kecil ---------- */
@media (max-width: 760px) {
    .halaman { grid-template-columns: 1fr; }
    .sisi, .utama { padding: 1.75rem 1.4rem; }
    .sisi h1 { font-size: 1.9rem; }
    .sisi::after { font-size: 3.6rem; }
}

@media (prefers-reduced-motion: reduce) {
    * { transition: none !important; }
}


/* ==========================================================
   Tambahan: pembungkus, tombol navigasi, halaman penjelasan
   ========================================================== */

.bungkus {
    width: 100%;
    max-width: 980px;
}

/* ---------- Tombol navigasi bulat  <  > ---------- */
.nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.25rem;
    margin-top: 1.5rem;
}

.nav-btn {
    display: grid;
    place-items: center;
    width: 3.4rem;
    height: 3.4rem;
    font: 700 1.7rem/1 ui-monospace, Consolas, "Courier New", monospace;
    color: var(--abu-900);
    text-decoration: none;
    background: rgba(255, 255, 255, .55);
    border: 3px solid var(--abu-900);
    border-radius: 50%;
    transition: background-color .15s, color .15s, border-color .15s, transform .05s;
}

a.nav-btn:hover {
    color: #fff;
    background: var(--marun-500);
    border-color: var(--marun-500);
}

a.nav-btn:active { transform: translateY(1px); }

a.nav-btn:focus-visible {
    outline: 3px solid var(--marun-500);
    outline-offset: 3px;
}

.nav-btn.mati {
    opacity: .35;
    cursor: not-allowed;
}

.nav-info {
    min-width: 9.5rem;
    text-align: center;
    font-size: .85rem;
    line-height: 1.35;
    color: var(--abu-700);
}

.nav-info b {
    display: block;
    font-size: 1rem;
    color: var(--abu-900);
}

/* ---------- Halaman penjelasan ---------- */
.kertas {
    overflow: hidden;
    border-radius: 20px;
    box-shadow: 0 24px 60px rgba(58, 53, 55, .35);
}

.kertas-kepala {
    position: relative;
    overflow: hidden;
    padding: 2.25rem 2.25rem 2rem;
    color: #fff;
    background: linear-gradient(160deg, var(--marun-500), var(--marun-700));
}

.kertas-kepala::after {
    content: "mod 256";
    position: absolute;
    right: 1.5rem;
    bottom: -.9rem;
    font: 800 4.6rem/1 ui-monospace, Consolas, "Courier New", monospace;
    color: rgba(255, 255, 255, .10);
    pointer-events: none;
}

.kertas-kepala h1 {
    margin: 0 0 .4rem;
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -.02em;
}

.kertas-kepala p {
    margin: 0;
    max-width: 56ch;
    color: var(--marun-100);
}

.kertas-isi {
    padding: 2rem 2.25rem 2.5rem;
    background: var(--abu-50);
}

/* form kecil di atas */
.form-baris {
    display: grid;
    grid-template-columns: 1.4fr 1fr auto;
    gap: .9rem;
    align-items: end;
    padding: 1.1rem;
    margin-bottom: .5rem;
    background: var(--abu-100);
    border: 1px solid var(--abu-200);
    border-radius: 14px;
}

.form-baris label { margin: 0 0 .35rem; }
.form-baris button { flex: none; padding: .8rem 1.4rem; background: var(--marun-500); }
.form-baris button:hover { background: var(--marun-600); }

.catatan {
    margin: .6rem 0 0;
    font-size: .88rem;
    color: var(--abu-700);
}

/* bagian-bagian langkah */
.bagian {
    margin-top: 2rem;
    padding-top: 1.75rem;
    border-top: 2px solid var(--abu-200);
}

.bagian:first-of-type { border-top: 0; padding-top: 0; }

.bagian h2 {
    display: flex;
    align-items: center;
    gap: .7rem;
    margin: 0 0 .6rem;
    font-size: 1.25rem;
}

.lencana {
    display: inline-grid;
    place-items: center;
    flex: none;
    min-width: 2rem;
    height: 2rem;
    padding: 0 .55rem;
    font-size: .9rem;
    font-weight: 800;
    color: #fff;
    background: var(--marun-500);
    border-radius: 999px;
}

.bagian p { margin: .4rem 0; max-width: 75ch; }

.rumus {
    margin: .8rem 0;
    padding: .9rem 1.1rem;
    font: 700 1.25rem/1.5 ui-monospace, "Cascadia Code", Consolas, "Courier New", monospace;
    color: var(--marun-700);
    background: #fff;
    border-left: 5px solid var(--marun-500);
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(58, 53, 55, .08);
    overflow-x: auto;
}

.legenda {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: .5rem .9rem;
    margin: .8rem 0 0;
}

.legenda div {
    padding: .55rem .8rem;
    font-size: .9rem;
    background: var(--abu-100);
    border-radius: 8px;
}

.legenda dt { font-weight: 800; color: var(--marun-600); }
.legenda dd { margin: 0; color: var(--abu-700); }

/* tabel perhitungan */
.tabel-bungkus {
    margin: .9rem 0;
    overflow-x: auto;
    background: #fff;
    border: 1px solid var(--abu-200);
    border-radius: 12px;
}

table.hitung {
    width: 100%;
    border-collapse: collapse;
    font-size: .92rem;
    white-space: nowrap;
}

.hitung th,
.hitung td {
    padding: .55rem .8rem;
    text-align: center;
    border-bottom: 1px solid var(--abu-200);
}

.hitung th {
    font-size: .8rem;
    color: var(--abu-700);
    background: var(--abu-100);
}

.hitung tbody tr:nth-child(even) { background: var(--abu-50); }
.hitung tbody tr:last-child td { border-bottom: 0; }
.hitung td { font-family: ui-monospace, "Cascadia Code", Consolas, "Courier New", monospace; }
.hitung td.hasil-kolom { font-weight: 800; color: var(--marun-700); background: var(--marun-100); }

.chip-baris {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .35rem;
    margin: .5rem 0;
    font-family: ui-monospace, "Cascadia Code", Consolas, "Courier New", monospace;
}

.chip-baris .label {
    min-width: 7.5rem;
    font-family: "Segoe UI", system-ui, sans-serif;
    font-size: .88rem;
    font-weight: 600;
    color: var(--abu-700);
}

.chip {
    padding: .15rem .55rem;
    font-weight: 700;
    color: var(--marun-700);
    background: #fff;
    border: 1px solid var(--abu-300);
    border-radius: 6px;
}

.chip.hex { background: var(--abu-100); }

.akhir {
    margin: .9rem 0 0;
    padding: .85rem 1.1rem;
    font-weight: 700;
    color: var(--abu-900);
    background: #fff;
    border-left: 5px solid var(--marun-500);
    border-radius: 10px;
    word-break: break-all;
}

.akhir code {
    font-family: ui-monospace, "Cascadia Code", Consolas, "Courier New", monospace;
    color: var(--marun-700);
}

@media (max-width: 760px) {
    .kertas-kepala, .kertas-isi { padding-left: 1.3rem; padding-right: 1.3rem; }
    .kertas-kepala h1 { font-size: 1.6rem; }
    .form-baris { grid-template-columns: 1fr; }
    .chip-baris .label { min-width: 100%; }
}



/* ==========================================================
   Login dan Register
   ========================================================== */
:root {
    --maroon: #7a1b2d;
    --maroon-dark: #561020;
    --maroon-mid: #8f2338;
    --bg: #e8eaee;
    --panel: #f6f7f9;
    --text: #1f2330;
    --muted: #7b8190;
    --border: #dfe2e8;
}

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

body {
    font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
}

a { color: var(--maroon); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Auth (login & register) ---------- */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.auth-card {
    display: flex;
    width: 100%;
    max-width: 880px;
    min-height: 480px;
    border-radius: 14px;
    overflow: hidden;
    background: var(--panel);
    box-shadow: 0 10px 30px rgba(30, 20, 30, .14);
}

.auth-left {
    flex: 0 0 48%;
    padding: 30px 28px;
    color: #fff;
    background:
        radial-gradient(ellipse at 40% 100%, rgba(255, 255, 255, .08), transparent 60%),
        linear-gradient(160deg, var(--maroon-mid), var(--maroon-dark));
    display: flex;
    flex-direction: column;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
}
.brand i { font-size: 26px; }

.tagline {
    margin-top: 18px;
    font-size: 14px;
    line-height: 1.6;
    color: #f3dde2;
}

.illustration {
    width: 100%;
    max-width: 300px;
    margin: auto;
    padding-top: 12px;
}

.auth-right {
    flex: 1;
    padding: 38px 36px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.auth-right h1 {
    font-size: 26px;
    font-weight: 700;
    color: var(--maroon);
}

.subtitle {
    margin: 6px 0 20px;
    color: var(--muted);
    font-size: 13px;
}

/* Input dengan label di dalam kotak */
.field {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 9px 14px;
    margin-bottom: 14px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: border-color .15s, box-shadow .15s;
}
.field:focus-within {
    border-color: var(--maroon);
    box-shadow: 0 0 0 3px rgba(122, 27, 45, .12);
}
.field .icon { color: #4b5160; font-size: 16px; width: 18px; text-align: center; }
.field-body { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.field-body label { font-size: 12px; font-weight: 600; }
.field-body input {
    border: none;
    outline: none;
    background: transparent;
    font: inherit;
    font-size: 12.5px;
    padding-top: 3px;
    color: var(--text);
}
.field-body input::placeholder { color: #a6abb6; }
.toggle {
    border: none;
    background: none;
    cursor: pointer;
    color: #4b5160;
    font-size: 15px;
}

/* Tombol */
.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 11px;
    border-radius: 6px;
    font: inherit;
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    border: 1px solid var(--maroon);
    transition: background .15s;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--maroon); color: #fff; margin-top: 6px; }
.btn-primary:hover { background: var(--maroon-dark); }
.btn-outline { background: #fff; color: var(--maroon); }
.btn-outline:hover { background: #fbeff1; }

.divider {
    position: relative;
    text-align: center;
    margin: 14px 0;
    color: var(--muted);
    font-size: 12px;
}
.divider::before {
    content: "";
    position: absolute;
    left: 0; right: 0; top: 50%;
    border-top: 1px solid var(--border);
}
.divider span { position: relative; background: var(--panel); padding: 0 10px; }

.foot-link { text-align: center; margin-top: 18px; font-size: 12.5px; }

.alert {
    padding: 10px 12px;
    border-radius: 6px;
    font-size: 12.5px;
    margin-bottom: 14px;
}
.alert.error { background: #fdecee; color: #9b1c2e; border: 1px solid #f3c3ca; }
.alert.success { background: #e9f6ee; color: #1d6b3a; border: 1px solid #bfe3cc; }

/* ---------- Dashboard ---------- */
.dash-page { padding: 24px; }

.app {
    max-width: 1100px;
    margin: 0 auto;
    background: var(--panel);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(30, 20, 30, .14);
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 22px;
    height: 54px;
    background: var(--maroon);
    color: #fff;
}
.topbar .brand { font-size: 17px; }
.topbar .brand i { font-size: 22px; }

.user-menu { position: relative; }
.user-menu summary {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 13px;
}
.user-menu summary::-webkit-details-marker { display: none; }
.user-menu summary .fa-chevron-down { font-size: 10px; }
.avatar {
    width: 24px; height: 24px;
    display: grid; place-items: center;
    border-radius: 50%;
    background: #e8c9d0;
    color: var(--maroon);
    font-size: 12px;
}
.user-menu a {
    position: absolute;
    right: 0; top: 36px;
    white-space: nowrap;
    background: #fff;
    color: var(--maroon);
    padding: 9px 16px;
    border-radius: 6px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, .2);
    font-size: 13px;
    z-index: 5;
}

.app-body { display: flex; min-height: 440px; }

.sidebar {
    flex: 0 0 218px;
    background: #fff;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border);
}
.sidebar nav { padding: 22px 18px; display: flex; flex-direction: column; gap: 4px; }
.sidebar nav a {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 10px 14px;
    border-radius: 6px;
    color: var(--text);
    font-size: 14px;
}
.sidebar nav a i { width: 18px; text-align: center; font-size: 15px; }
.sidebar nav a:hover { background: #f6eaec; text-decoration: none; }
.sidebar nav a.active { background: var(--maroon); color: #fff; font-weight: 600; }

.sidebar-foot {
    margin-top: auto;
    padding: 70px 18px 18px;
    font-size: 11px;
    color: #fff;
    background:
        radial-gradient(ellipse at 30% 0%, rgba(255, 255, 255, .55) 0 38%, transparent 39%),
        linear-gradient(160deg, var(--maroon-mid), var(--maroon-dark));
}

.content { flex: 1; padding: 20px; min-width: 0; }

.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 28px;
    border-radius: 8px;
    color: #fff;
    background: linear-gradient(100deg, var(--maroon-mid), var(--maroon-dark));
    overflow: hidden;
}
.hero h2 { font-size: 22px; margin-bottom: 12px; }
.hero p { font-size: 14px; line-height: 1.6; color: #f6e6ea; }
.hero-icon { font-size: 90px; margin-right: 40px; color: rgba(255, 255, 255, .22); }

.cards {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1.35fr;
    gap: 14px;
    margin-top: 16px;
}
.card {
    background: #fff;
    border-radius: 8px;
    padding: 18px;
    box-shadow: 0 2px 8px rgba(30, 20, 30, .08);
    display: flex;
    flex-direction: column;
}
.card h3 { font-size: 16px; margin: 12px 0 6px; }
.card p { font-size: 12.5px; color: #4b5160; line-height: 1.5; margin-bottom: 14px; }

.card-icon {
    width: 46px; height: 46px;
    display: grid; place-items: center;
    border-radius: 10px;
    color: #fff;
    font-size: 19px;
}
.maroon { background: var(--maroon); }
.gray { background: #5d6470; }
.lightgray { background: #8a919c; }

.btn-sm {
    margin-top: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px;
    border-radius: 5px;
    color: #fff;
    font-size: 12px;
    font-weight: 600;
}
.btn-sm:hover { text-decoration: none; opacity: .9; }

.card.about h3 { font-size: 13px; margin-top: 0; display: flex; align-items: center; gap: 8px; }
.card.about h3 i { color: var(--maroon); }
.card.about p { font-size: 12px; margin-bottom: 10px; }
.card.about ol { list-style: none; font-size: 12.5px; }
.card.about li { display: flex; align-items: center; gap: 10px; margin-bottom: 9px; }
.card.about li span {
    width: 18px; height: 18px;
    display: grid; place-items: center;
    border-radius: 50%;
    background: var(--maroon);
    color: #fff;
    font-size: 10px;
    font-weight: 700;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
    .cards { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
    .auth-card { flex-direction: column; }
    .auth-left { flex: none; padding: 22px; }
    .illustration { display: none; }
    .auth-right { padding: 28px 22px; }
    .app-body { flex-direction: column; }
    .sidebar { flex: none; }
    .sidebar nav { flex-direction: row; flex-wrap: wrap; padding: 12px; }
    .sidebar-foot { display: none; }
    .hero-icon { display: none; }
    .cards { grid-template-columns: 1fr; }
}