@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;600&display=swap');

/* ---- Reset & Base ---- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-dark: #0d1117;
  --bg-card: #161b22;
  --bg-glass: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.08);
  --accent: #f5a623;
  --accent-2: #f0f0f0;
  --accent-glow: rgba(245, 166, 35, 0.3);
  --green: #10b981;
  --yellow: #f59e0b;
  --red: #ef4444;
  --blue: #3b82f6;
  --text-1: #f0f6fc;
  --text-2: #8b949e;
  --text-3: #484f58;
  --font-mono: 'JetBrains Mono', monospace;
  --font-sans: 'Inter', sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-dark);
  color: var(--text-1);
  min-height: 100vh;
  line-height: 1.6;
}

/* ---- Background gradient mesh ---- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(124, 58, 237, 0.15) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(59, 130, 246, 0.1) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* ---- Layout ---- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px 80px;
  position: relative;
  z-index: 1;
}

/*
   Header 
*/
.site-header {
  text-align: center;
  padding: 56px 0 32px;
}

.site-header .badge {
  display: inline-block;
  background: var(--accent-glow);
  border: 1px solid rgb(245, 166, 35);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 14px;
  border-radius: 99px;
  margin-bottom: 20px;
}

.site-header h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  background: linear-gradient(135deg, #f5a623 0%, #e5ad54 50%, #f5a623 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.site-header p {
  color: var(--text-2);
  font-size: 1rem;
  max-width: 520px;
  margin: 0 auto;
}

/*
   Card / Section
*/
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-title .icon {
  width: 32px;
  height: 32px;
  background: var(--accent-glow);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

/*
   Form Controls
*/
.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.input-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.input-row select {
  flex-shrink: 0;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  padding: 0 12px;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s;
}

.input-row select:hover {
  border-color: var(--accent);
}

input[type="text"],
textarea {
  width: 100%;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-1);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 12px 16px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="text"]:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input[type="text"]::placeholder {
  color: var(--text-3);
}

/*
   Radio Mode Selector
*/
.mode-selector {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
}

.mode-option {
  flex: 1;
  position: relative;
}

.mode-option input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
}

.mode-option label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-glass);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text-2);
  margin: 0;
}

.mode-option input:checked+label {
  border-color: var(--accent);
  background: var(--accent-glow);
  color: #f5a623;
  box-shadow: 0 0 0 1px var(--accent);
}

.mode-option label:hover {
  border-color: rgba(124, 58, 237, 0.5);
  color: var(--text-1);
}

/*
   Buttons
*/
.btn-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #f5a624);
  color: #fff;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-secondary {
  background: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.btn-secondary:hover {
  background: rgba(59, 130, 246, 0.25);
  transform: translateY(-1px);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.1);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.25);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.2);
}

.btn-sm {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-glass);
  color: var(--text-2);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-sm:hover {
  border-color: var(--accent);
  color: #a78bfa;
}

/* 
   Status Message
*/
.status-msg {
  margin-top: 12px;
  font-size: 0.85rem;
  min-height: 20px;
  padding: 0 2px;
  border-radius: 4px;
  transition: all 0.2s;
}

.status-msg.error {
  color: #f87171;
}

.status-msg.success {
  color: #34d399;
}

.status-msg.info {
  color: var(--text-2);
}

/*
   Output Section
*/
#output-section {
  display: none;
}

.output-box {
  display: flex;
  gap: 10px;
  align-items: stretch;
}

.output-box input {
  flex: 1;
  background: rgba(16, 185, 129, 0.05);
  border-color: rgba(16, 185, 129, 0.2);
  font-size: 1rem;
  letter-spacing: 0.05em;
}

.output-box input:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
}

#copy-btn {
  padding: 12px 20px;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-sm);
  color: #34d399;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}

#copy-btn:hover {
  background: rgba(16, 185, 129, 0.25);
}

.verify-ok {
  color: #34d399;
  font-size: 0.82rem;
  margin-top: 8px;
}

.verify-warn {
  color: #f59e0b;
  font-size: 0.82rem;
  margin-top: 8px;
}

.verify-info {
  color: var(--text-3);
  font-size: 0.82rem;
  margin-top: 8px;
}

/* 
   Results Section
*/
#results-section {
  display: none;
}

.results-tabs {
  display: flex;
  gap: 4px;
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-sm);
  padding: 4px;
  margin-bottom: 20px;
}

.tab-btn {
  flex: 1;
  padding: 8px;
  background: transparent;
  border: none;
  border-radius: 6px;
  color: var(--text-2);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.tab-btn.active {
  background: var(--bg-card);
  color: var(--text-1);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/*
   Key Expansion Panel
*/
.kex-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 16px;
}

.kex-header {
  background: rgba;
  border-bottom: 1px solid var(--border);
  padding: 14px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
  transition: background 0.2s;
}

.kex-header:hover {
  background: rgba(124, 58, 237, 0.18);
}

.kex-header-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: #f5a624;
}

#kex-body {
  padding: 20px;
  background: var(--bg-dark);
  max-height: 600px;
  overflow-y: auto;
}

#kex-body.collapsed {
  display: none;
}

/* Key Expansion internal styles */
.kex-section-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
  margin: 20px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

.kex-section-title:first-child {
  margin-top: 0;
}

.kex-init-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 8px;
}

.kex-word {
  margin-bottom: 12px;
}

.kex-word.init {}

.kex-word.g-func {
  background: rgba(245, 166, 36, 0.05);
  border: 1px solid rgba(245, 166, 36, 0.15);
  border-radius: 8px;
  padding: 14px;
}

.kex-word.xor-only {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.kex-idx {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #f5a624;
  font-weight: 600;
  min-width: 40px;
  display: inline-block;
}

.kex-val {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-1);
  font-weight: 600;
}

/* g() function detail */
.g-func-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: #f5a624;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.g-func-title::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  background: #f5a624;
  border-radius: 50%;
}

.g-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 8px;
  margin-bottom: 10px;
}

.g-step {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 6px;
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.g-step.result {
  background: rgba(245, 166, 36, 0.15);
  border: 1px solid rgba(245, 166, 36, 0.25);
}

.g-lbl {
  font-size: 0.7rem;
  color: var(--text-3);
  font-weight: 500;
}

.g-val {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-1);
  font-weight: 600;
}

.kex-formula {
  font-size: 0.8rem;
  color: var(--text-2);
  font-family: var(--font-mono);
  background: rgba(0, 0, 0, 0.25);
  border-radius: 6px;
  padding: 8px 10px;
  margin-top: 8px;
}

.kex-formula strong {
  color: #34d399;
}

.kex-xor-detail {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-2);
}

.kex-xor-detail strong {
  color: #60a5fa;
}

/* Round Keys grid */
.kex-rk-section {
  margin-top: 24px;
}

.kex-rk-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}

.kex-rk-card {
  background: rgba(59, 130, 246, 0.06);
  border: 1px solid rgba(59, 130, 246, 0.15);
  border-radius: 8px;
  padding: 12px;
}

.kex-rk-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: #60a5fa;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

.kex-rk-words {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-2);
  margin-bottom: 4px;
  word-break: break-all;
}

.kex-rk-hex {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-1);
  font-weight: 600;
  word-break: break-all;
}

/* 
   Round Panels (enkripsi / dekripsi)
*/
.rounds-mode-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
  margin-bottom: 12px;
}

.expand-collapse-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.round-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 10px;
  overflow: hidden;
}

.round-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--bg-glass);
  cursor: pointer;
  user-select: none;
  transition: background 0.2s;
  flex-wrap: wrap;
}

.round-header:hover {
  background: rgba(255, 255, 255, 0.06);
}

.round-label {
  font-weight: 600;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.round-rk {
  font-size: 0.75rem;
  color: var(--text-2);
  flex: 1;
}

.round-rk code {
  font-family: var(--font-mono);
  color: var(--yellow);
  font-size: 0.78rem;
}

.round-toggle {
  color: var(--text-3);
  font-size: 0.8rem;
  flex-shrink: 0;
}

.round-body {
  padding: 16px 18px;
  background: var(--bg-dark);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.round-body.collapsed {
  display: none;
}

/*
   Step Block (satu operasi: before → after)
*/
.step-block {
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-sm);
  padding: 14px;
  border: 1px solid var(--border);
}

.step-op-label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  padding-left: 10px;
  border-left: 3px solid currentColor;
}

.step-matrices {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.step-arrow {
  font-size: 1.2rem;
  color: var(--text-3);
  flex-shrink: 0;
}

/*
   State Matrix Table
*/
.matrix-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.matrix-title {
  font-size: 0.7rem;
  color: var(--text-3);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.matrix-table {
  border-collapse: separate;
  border-spacing: 3px;
}

.matrix-table td {
  width: 36px;
  height: 36px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 4px;
  color: var(--text-1);
  transition: background 0.2s;
}

.matrix-table td:hover {
  background: rgba(124, 58, 237, 0.2);
}

/*
   Info Bar di bawah header
*/
.info-bar {
  background: rgba(59, 130, 246, 0.06);
  border: 1px solid rgba(59, 130, 246, 0.15);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.82rem;
  color: var(--text-2);
  margin-bottom: 20px;
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.info-bar span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.info-bar strong {
  color: #f5a624;
}

/*
   Scrollbar Styling
*/
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 99px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/*
   Responsive
*/
@media (max-width: 640px) {
  .step-matrices {
    flex-direction: column;
  }

  .step-arrow {
    transform: rotate(90deg);
  }

  .kex-init-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .g-steps {
    grid-template-columns: 1fr 1fr;
  }

  .btn-row {
    flex-direction: column;
  }

  .btn-row .btn {
    width: 100%;
    justify-content: center;
  }

  .mode-selector {
    flex-direction: column;
  }
}

/*
   Animasi muncul
*/
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card {
  animation: fadeInUp 0.4s ease both;
}

.card:nth-child(2) {
  animation-delay: 0.05s;
}

.card:nth-child(3) {
  animation-delay: 0.1s;
}

.round-panel {
  animation: fadeInUp 0.25s ease both;
}

/*
   Utility & Missing Classes
*/

/* Input hint text di bawah field */
.input-hint {
  display: block;
  font-size: 0.73rem;
  color: var(--text-3);
  margin-top: 5px;
  font-family: var(--font-sans);
}

/* Placeholder saat panel belum ada konten */
.placeholder-msg {
  color: var(--text-3);
  text-align: center;
  padding: 20px 0;
  font-size: 0.85rem;
  font-style: italic;
}

/* Wrapper W-words di key expansion */
.kex-words {
  margin-bottom: 8px;
}

/* kex-word init: kartu sederhana di grid */
.kex-word.init {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* Detail g() wrapper */
.g-func-detail {
  margin-top: 6px;
}