/* ====== Variabel Warna ====== */
:root {
    --co-bg: #0b0b0b;
    --co-card: #151515;
    --co-line: #262626;
    --co-text: #ffffff;
    --co-sub: #a8a8a8;
    --co-accent: #00d9ff;
    --co-accent2: #00ff99;
}

/* ====== Base & Footer Sticky ====== */
html,
body {
    height: 100%;
}

body {
    margin: 0;
    display: flex;
    flex-direction: column;
    background: var(--co-bg);
    color: var(--co-text);
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, "Helvetica Neue", Arial, sans-serif;
}

/* ====== Wrapper ====== */
.co-wrap {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px clamp(16px, 4vw, 40px) 40px;
    /* top dipadatkan */
}

/* ====== Header mini ====== */
.co-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
    /* rapat dengan konten */
}

.co-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--co-text);
}

.co-brand img {
    width: 28px;
    height: 28px;
    object-fit: contain;
}

.co-back {
    color: #ddd;
    text-decoration: none;
    font-weight: 600;
    border: 1px solid var(--co-line);
    padding: 8px 12px;
    border-radius: 10px;
}

.co-back:hover {
    background: #111;
}

/* ====== Heading ====== */
.co-title {
    text-align: center;
    font-weight: 900;
    font-size: clamp(2rem, 4vw, 3rem);
    margin: 0 0 8px;
    color: var(--co-accent);
}

.co-sub {
    text-align: center;
    color: var(--co-sub);
    margin: 0 0 32px;
    font-size: 1.05rem;
}

/* ====== Grid ====== */
.co-grid {
    display: grid;
    gap: clamp(16px, 3vw, 28px);
    grid-template-columns: 1fr;
}

@media (min-width:900px) {
    .co-grid {
        grid-template-columns: 1.4fr 1fr;
        /* form lebih ramping */
        align-items: start;
    }

    .co-summary {
        position: sticky;
        top: 16px;
    }

    /* batasi lebar maksimal kartu kiri agar tidak kebesaran */
    .co-grid>.co-card:first-child {
        max-width: 720px;
        padding: 20px;
    }
}

/* ====== Card ====== */
.co-card {
    background: var(--co-card);
    border: 1px solid var(--co-line);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, .25);
}

.co-card h3 {
    margin: 0 0 14px;
    font-size: 1.14rem;
}

/* ====== Form ====== */
.co-form {
    display: grid;
    gap: 16px;
}

.co-field {
    display: grid;
    gap: 6px;
}

.co-field>label {
    font-weight: 700;
}

.co-input,
.co-select {
    background: #0b0b0b;
    color: var(--co-text);
    border: 1px solid var(--co-line);
    padding: 10px 12px;
    border-radius: 10px;
    outline: none;
}

.co-input:focus,
.co-select:focus {
    border-color: var(--co-accent);
    box-shadow: 0 0 0 3px #00d9ff20;
}

.co-help {
    color: var(--co-sub);
    font-size: .9rem;
}

/* ====== Summary ====== */
.co-sum-row {
    display: flex;
    justify-content: space-between;
    margin: 10px 0;
    gap: 12px;
}

.co-sum-row .co-label {
    color: var(--co-sub);
}

.co-total {
    font-size: 1.3rem;
    font-weight: 800;
    margin-top: 10px;
}

.co-badge {
    display: inline-block;
    padding: 4px 8px;
    border: 1px solid var(--co-line);
    border-radius: 999px;
    font-size: .85rem;
    color: #ddd;
}

.co-divider {
    border: 0;
    border-top: 1px solid var(--co-line);
    margin: 16px 0;
}

/* ====== Actions (kiri & kanan) ====== */
.co-actions {
    display: flex;
    gap: 12px;
    margin-top: 12px;
}

.co-actions--left {
    justify-content: flex-start;
}

.co-actions--right {
    justify-content: flex-end;
}

/* Buttons */
.co-btn {
    border: none;
    cursor: pointer;
    border-radius: 12px;
    padding: 12px 22px;
    font-weight: 800;
    transition: all .2s ease;
}

.co-btn-primary {
    background: linear-gradient(135deg, var(--co-accent), var(--co-accent2));
    color: #111;
    box-shadow: 0 8px 28px rgba(0, 217, 255, .35), 0 0 20px rgba(0, 255, 153, .25) inset;
}

.co-btn-primary:hover {
    filter: brightness(1.08);
    transform: translateY(-2px);
}

.co-btn-ghost {
    background: #1b1b1b;
    color: #fff;
    border: 1px solid var(--co-line);
}

.co-btn-ghost:hover {
    background: #222;
}

/* ====== Footer ====== */
.co-foot {
    text-align: center;
    padding: 16px 0;
    margin-top: auto;
    border-top: 1px solid var(--co-line);
    color: var(--co-sub);
    background: #0b0b0b;
}