:root {
    --bg: #07111f;
    --panel: rgba(255, 255, 255, 0.09);
    --panel-strong: rgba(255, 255, 255, 0.14);
    --border: rgba(255, 255, 255, 0.16);
    --text: #eef6ff;
    --muted: #a8b5c7;
    --primary: #50d8ff;
    --secondary: #8b5cf6;
    --success: #4ade80;
    --danger: #fb7185;
    --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
    --radius: 24px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Inter', Arial, sans-serif;
    color: var(--text);
    background: radial-gradient(circle at top left, #142d4e 0, #07111f 45%, #040812 100%);
    min-height: 100vh;
}

.bg-blur {
    position: fixed;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.35;
    z-index: -1;
}

.bg-one {
    background: var(--primary);
    top: 70px;
    left: -80px;
}

.bg-two {
    background: var(--secondary);
    bottom: 80px;
    right: -90px;
}

.container {
    width: min(1120px, 92%);
    margin: 0 auto;
}

.hero {
    padding: 60px 0 35px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.6fr 0.8fr;
    gap: 28px;
    align-items: center;
}

.badge {
    display: inline-flex;
    padding: 8px 14px;
    border: 1px solid rgba(80, 216, 255, 0.4);
    color: var(--primary);
    border-radius: 999px;
    font-weight: 700;
    font-size: 13px;
    background: rgba(80, 216, 255, 0.08);
}

.badge.soft {
    color: var(--success);
    border-color: rgba(74, 222, 128, 0.35);
    background: rgba(74, 222, 128, 0.09);
}

.hero h1 {
    font-size: clamp(34px, 6vw, 64px);
    line-height: 1.02;
    margin: 18px 0 16px;
    letter-spacing: -0.05em;
}

.hero p {
    color: var(--muted);
    max-width: 720px;
    font-size: 17px;
    line-height: 1.7;
}

.hero-card,
.panel {
    background: linear-gradient(145deg, rgba(255,255,255,0.13), rgba(255,255,255,0.06));
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    backdrop-filter: blur(18px);
    border-radius: var(--radius);
}

.hero-card {
    padding: 24px;
}

.mini-title {
    font-size: 13px;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 12px;
}

.spec-row {
    display: flex;
    justify-content: space-between;
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
}

.spec-row:last-child {
    border-bottom: 0;
}

.spec-row span {
    color: var(--muted);
}

.panel {
    margin-bottom: 26px;
    padding: 28px;
}

.panel-head h2,
.result-header h2,
.section-title h2 {
    margin: 0 0 8px;
    font-size: 26px;
}

.panel-head p,
.section-title p {
    margin: 0 0 24px;
    color: var(--muted);
}

.sdes-form {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 9px;
}

label {
    font-weight: 700;
}

input,
select {
    width: 100%;
    border: 1px solid var(--border);
    background: rgba(255,255,255,0.08);
    color: var(--text);
    border-radius: 16px;
    padding: 15px 16px;
    font-size: 16px;
    outline: none;
}

select option {
    color: #111827;
}

input:focus,
select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(80,216,255,0.12);
}

small {
    color: var(--muted);
    line-height: 1.4;
}

.button-group {
    grid-column: 1 / -1;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn,
.toggle-btn {
    border: 0;
    cursor: pointer;
    font-weight: 800;
    border-radius: 16px;
    padding: 14px 22px;
    letter-spacing: 0.02em;
}

.btn.primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
}

.btn.secondary,
.toggle-btn {
    background: rgba(255,255,255,0.1);
    color: var(--text);
    border: 1px solid var(--border);
}

.alert {
    padding: 14px 16px;
    border-radius: 16px;
    background: rgba(251,113,133,0.13);
    border: 1px solid rgba(251,113,133,0.35);
    color: #fecdd3;
    margin-bottom: 18px;
    font-weight: 700;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 18px;
    margin-bottom: 22px;
}

.result-text {
    font-size: 34px;
    font-weight: 900;
    letter-spacing: 0.12em;
    color: var(--success);
}

.bit-row,
.mini-bits {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.bit-box {
    width: 58px;
    height: 68px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    background: rgba(80,216,255,0.1);
    border: 1px solid rgba(80,216,255,0.3);
}

.bit-index {
    font-size: 11px;
    color: var(--muted);
}

.bit-box strong {
    font-size: 28px;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-top: 22px;
}

.summary-grid div {
    padding: 16px;
    border-radius: 18px;
    background: rgba(255,255,255,0.07);
    border: 1px solid var(--border);
}

.summary-grid span {
    display: block;
    color: var(--muted);
    margin-bottom: 6px;
    font-size: 13px;
}

.summary-grid strong {
    letter-spacing: 0.08em;
}

.toggle-btn {
    width: 100%;
    text-align: left;
    font-size: 16px;
}

.solution-content {
    display: none;
    margin-top: 28px;
}

.solution-content.show {
    display: block;
}

.steps {
    display: grid;
    gap: 16px;
}

.step-card {
    display: grid;
    grid-template-columns: 46px 1fr;
    gap: 16px;
    background: rgba(255,255,255,0.07);
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 18px;
}

.step-number {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(80,216,255,0.25), rgba(139,92,246,0.25));
    font-weight: 900;
}

.step-body h3 {
    margin: 0 0 8px;
    font-size: 19px;
}

.step-body p {
    margin: 0 0 14px;
    color: var(--muted);
    line-height: 1.6;
}

.calc-box {
    display: grid;
    gap: 7px;
    margin-top: 10px;
    padding: 14px;
    border-radius: 16px;
    background: rgba(0,0,0,0.18);
    border: 1px solid rgba(255,255,255,0.1);
}

.calc-box span {
    color: var(--muted);
    font-size: 13px;
    font-weight: 700;
}

code {
    color: #dbeafe;
    font-size: 15px;
    white-space: normal;
    word-break: break-word;
}

.result-calc code {
    color: #bbf7d0;
}

.mini-bits {
    margin-top: 12px;
}

.mini-bits span {
    width: 32px;
    height: 32px;
    display: grid;
    place-items: center;
    border-radius: 10px;
    background: rgba(74,222,128,0.12);
    border: 1px solid rgba(74,222,128,0.24);
    font-weight: 800;
}

.sbox-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-top: 14px;
}

.sbox-card {
    padding: 14px;
    border-radius: 16px;
    border: 1px solid rgba(80,216,255,0.22);
    background: rgba(80,216,255,0.07);
}

.sbox-card h4 {
    margin: 0 0 8px;
    color: var(--primary);
}

.sbox-card p {
    margin: 5px 0;
}

.mt {
    margin-top: 34px;
}

.footer {
    text-align: center;
    color: var(--muted);
    padding: 28px 16px 44px;
}

@media (max-width: 860px) {
    .hero-grid,
    .sdes-form,
    .summary-grid,
    .sbox-grid {
        grid-template-columns: 1fr;
    }

    .result-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .result-text {
        font-size: 26px;
    }
}

@media (max-width: 520px) {
    .hero {
        padding-top: 34px;
    }

    .panel {
        padding: 20px;
    }

    .step-card {
        grid-template-columns: 1fr;
    }

    .bit-box {
        width: 46px;
        height: 58px;
    }
}

/* Tampilan solusi seperti contoh PDF */
.paper-card {
    margin: 16px 0;
    padding: 20px;
    border-radius: 20px;
    background: rgba(255,255,255,0.08);
    border: 1px solid var(--border);
}

.paper-card h3 {
    margin: 0 0 14px;
    color: var(--primary);
}

.table-wrap {
    width: 100%;
    overflow-x: auto;
    border-radius: 16px;
    border: 1px solid rgba(255,255,255,0.12);
}

.bit-table {
    width: 100%;
    min-width: 640px;
    border-collapse: collapse;
    background: rgba(3, 7, 18, 0.35);
}

.bit-table th,
.bit-table td {
    border: 1px solid rgba(255,255,255,0.14);
    text-align: center;
    padding: 11px 12px;
    font-weight: 800;
}

.bit-table th {
    background: rgba(80,216,255,0.18);
    color: #e0f7ff;
}

.bit-table .row-label {
    text-align: left;
    color: #bfdbfe;
    min-width: 180px;
    background: rgba(255,255,255,0.06);
}

.table-note,
.swap-note {
    margin: 14px 0 0;
    color: var(--text);
    line-height: 1.7;
    padding: 12px 14px;
    border-radius: 14px;
    background: rgba(74,222,128,0.09);
    border: 1px solid rgba(74,222,128,0.22);
}

.swap-note {
    background: rgba(139,92,246,0.10);
    border-color: rgba(139,92,246,0.25);
}

.final-note {
    font-size: 18px;
    font-weight: 900;
    color: #bbf7d0;
}