/* Custom Variable Colors - Nuansa IT Modern */
:root {
    --bg-color: #f0f4f8;
    --card-bg: #ffffff;
    --primary-color: #2b6cb0;
    --primary-hover: #1a4971;
    --accent-color: #319795;
    --text-color: #2d3748;
    --border-color: #e2e8f0;
    --bit-one-bg: #ebf8ff;
    --bit-one-border: #3182ce;
    --bit-zero-bg: #fff5f5;
    --bit-zero-border: #e53e3e;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    padding: 2rem 1rem;
    display: flex;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 650px;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

header p {
    color: #718096;
    font-weight: 500;
}

/* Desain Komponen Card */
.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05), 0 1px 3px rgba(0, 0, 0, 0.03);
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.card h2 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    border-bottom: 2px solid var(--bg-color);
    padding-bottom: 0.5rem;
}

/* Desain Form Element */
.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.95rem;
}

.form-group input[type="text"] {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    letter-spacing: 2px;
    font-weight: bold;
    transition: border-color 0.2s;
}

.form-group input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group-row {
    margin-bottom: 1.5rem;
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.form-group-row label {
    font-weight: 600;
    cursor: pointer;
}

/* Desain Tombol */
.button-group {
    display: flex;
    gap: 1rem;
}

button {
    flex: 1;
    padding: 0.8rem;
    font-size: 1rem;
    font-weight: bold;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.2s;
}

button[type="submit"] {
    background-color: var(--primary-color);
    color: white;
}

button[type="submit"]:hover {
    background-color: var(--primary-hover);
}

button[type="reset"] {
    background-color: #edf2f7;
    color: #4a5568;
}

button[type="reset"]:hover {
    background-color: #e2e8f0;
}

.btn-secondary {
    background-color: var(--accent-color);
    color: white;
    width: 100%;
    margin-top: 1rem;
}

.btn-secondary:hover {
    background-color: #287e7c;
}

/* Komponen Representasi Blok Bit (Array UI) */
.bit-container {
    display: flex;
    justify-content: center;
    margin: 1.5rem 0;
}

.bit-row {
    display: flex;
    gap: 0.35rem;
}

.bit-box {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    font-weight: bold;
    font-size: 1.1rem;
    border-radius: 6px;
    border: 2px solid;
}

.bit-box.one {
    background-color: var(--bit-one-bg);
    border-color: var(--bit-one-border);
    color: #2b6cb0;
}

.bit-box.zero {
    background-color: var(--bit-zero-bg);
    border-color: var(--bit-zero-border);
    color: #c53030;
}

/* Desain Section Hasil / Solusi Detail Step-by-Step */
.solution-block {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 2px dashed var(--border-color);
}

.solution-block h3 {
    font-size: 1.1rem;
    color: #2d3748;
    margin-bottom: 1rem;
    background: #edf2f7;
    padding: 0.4rem 0.8rem;
    border-left: 4px solid var(--primary-color);
}

.round-title {
    margin: 1.2rem 0 0.5rem 0;
    color: var(--accent-color);
    font-size: 1rem;
}

.step-item {
    margin-bottom: 1rem;
    padding-left: 0.5rem;
}

.step-item p {
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
    color: #4a5568;
}

.nested-step {
    background: #f7fafc;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    border-left: 3px solid var(--accent-color);
    font-size: 0.88rem;
    line-height: 1.6;
}

.flex-row {
    display: flex;
    gap: 2rem;
    margin-top: 0.25rem;
}

.flex-row>div {
    font-size: 0.85rem;
    font-weight: 500;
}

.highlight-swap {
    background: #f0fff4;
    padding: 0.5rem;
    border-radius: 6px;
    border: 1px dashed #38a169;
}

/* Kelas Pembantu */
.hidden {
    display: none !important;
}