/* ========================================
   DESIGN SYSTEM — MnemoGen
   ======================================== */
:root {
  --bg-base: #080b14;
  --bg-surface: #0d1220;
  --bg-card: #111827;
  --bg-card-hover: #161f32;
  --border: rgba(99,102,241,.18);
  --border-bright: rgba(99,102,241,.4);

  --accent: #6366f1;
  --accent-2: #8b5cf6;
  --accent-3: #06b6d4;
  --accent-glow: rgba(99,102,241,.35);

  --green: #10b981;
  --green-bg: rgba(16,185,129,.12);
  --red: #ef4444;
  --red-bg: rgba(239,68,68,.12);
  --amber: #f59e0b;

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #475569;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --font-sans: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --shadow-card: 0 4px 24px rgba(0,0,0,.4);
  --shadow-glow: 0 0 40px rgba(99,102,241,.2);
  --transition: .22s cubic-bezier(.4,0,.2,1);
}

/* ========== RESET ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
select { font-family: inherit; }
textarea { font-family: var(--font-mono); }

/* ========== BACKGROUND ========== */
.bg-grid {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(99,102,241,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99,102,241,.04) 1px, transparent 1px);
  background-size: 48px 48px;
}
.orb {
  position: fixed; border-radius: 50%; filter: blur(80px);
  pointer-events: none; z-index: 0; animation: drift 20s ease-in-out infinite alternate;
}
.orb-1 { width: 480px; height: 480px; top: -120px; left: -100px;
  background: radial-gradient(circle, rgba(99,102,241,.18) 0%, transparent 70%); animation-delay: 0s; }
.orb-2 { width: 400px; height: 400px; bottom: 10%; right: -80px;
  background: radial-gradient(circle, rgba(139,92,246,.14) 0%, transparent 70%); animation-delay: -8s; }
.orb-3 { width: 320px; height: 320px; top: 50%; left: 40%;
  background: radial-gradient(circle, rgba(6,182,212,.1) 0%, transparent 70%); animation-delay: -14s; }

@keyframes drift {
  from { transform: translate(0,0) scale(1); }
  to   { transform: translate(30px, 40px) scale(1.08); }
}

/* ========== HEADER ========== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(8,11,20,.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
}
.header-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.logo { display: flex; align-items: center; gap: .6rem; }
.logo-icon { font-size: 1.4rem; }
.logo-text { font-size: 1.1rem; font-weight: 700; letter-spacing: -.02em; }
.logo-badge {
  font-size: .65rem; font-weight: 600; letter-spacing: .08em;
  background: var(--accent-glow); color: var(--accent);
  border: 1px solid var(--border-bright); border-radius: 99px; padding: 2px 8px;
}
.nav-links { display: flex; gap: .4rem; }
.nav-link {
  font-size: .85rem; font-weight: 500; color: var(--text-secondary);
  padding: .45rem .9rem; border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: var(--text-primary); background: rgba(99,102,241,.12);
}

/* ========== HERO ========== */
.hero {
  position: relative; z-index: 1;
  padding: 7rem 2rem 5rem;
  text-align: center; max-width: 860px; margin: 0 auto;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: .6rem;
  font-size: .78rem; color: var(--text-secondary);
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 99px; padding: .4rem 1rem; margin-bottom: 2rem;
}
.hero-badge code { color: var(--accent); font-family: var(--font-mono); font-size: .76rem; }
.pulse-dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--green);
  box-shadow: 0 0 0 0 rgba(16,185,129,.4);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(16,185,129,.5); }
  70%  { box-shadow: 0 0 0 8px rgba(16,185,129,0); }
  100% { box-shadow: 0 0 0 0 rgba(16,185,129,0); }
}
.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800; line-height: 1.12; letter-spacing: -.04em;
  margin-bottom: 1.2rem;
}
.gradient-text {
  background: linear-gradient(135deg, var(--accent), var(--accent-2), var(--accent-3));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-subtitle { font-size: 1rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 2.4rem; }
.btn-hero { font-size: 1rem; padding: .85rem 2rem; }

.hero-stats {
  display: flex; gap: 1.5rem; justify-content: center; flex-wrap: wrap;
  margin-top: 4rem;
}
.stat-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 1.2rem 2rem; text-align: center;
  flex: 1; min-width: 140px; max-width: 200px;
  transition: var(--transition);
}
.stat-card:hover { border-color: var(--border-bright); box-shadow: var(--shadow-glow); transform: translateY(-2px); }
.stat-number { display: block; font-size: 1.6rem; font-weight: 800; color: var(--accent); letter-spacing: -.03em; }
.stat-label { display: block; font-size: .78rem; color: var(--text-muted); margin-top: .2rem; }

/* ========== SECTIONS ========== */
.section { position: relative; z-index: 1; padding: 5rem 2rem; }
.section-alt { background: rgba(13,18,32,.6); }
.container { max-width: 880px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 3rem; }
.section-title { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 700; letter-spacing: -.03em; margin-bottom: .6rem; }
.section-sub { font-size: .95rem; color: var(--text-secondary); }

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex; align-items: center; gap: .6rem;
  font-weight: 600; border-radius: var(--radius-md);
  transition: var(--transition); position: relative; overflow: hidden;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; padding: .7rem 1.6rem; font-size: .9rem;
  box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 28px var(--accent-glow); filter: brightness(1.1); }
.btn-primary:active { transform: translateY(0); }
.btn-primary.loading .btn-text { opacity: 0; }
.btn-primary.loading .btn-spinner { display: block; }

/* ========== CONTROLS CARD ========== */
.controls-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-xl); padding: 2rem 2.4rem;
  margin-bottom: 2rem; box-shadow: var(--shadow-card);
}
.controls-row { display: flex; gap: 2rem; flex-wrap: wrap; margin-bottom: 2rem; }
.control-group { flex: 1; min-width: 200px; }
.control-label {
  display: flex; align-items: center; gap: .4rem;
  font-size: .8rem; font-weight: 600; color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: .06em; margin-bottom: .6rem;
}
.control-select {
  width: 100%; background: var(--bg-surface); color: var(--text-primary);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: .7rem 1rem; font-size: .9rem; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right .8rem center; background-size: 16px;
  cursor: pointer; transition: var(--transition);
}
.control-select:focus { outline: none; border-color: var(--border-bright); }
.control-select-sm { max-width: 260px; }

.toggle-group { display: flex; gap: .6rem; }
.toggle-btn {
  flex: 1; display: flex; flex-direction: column; align-items: center; gap: .2rem;
  background: var(--bg-surface); color: var(--text-secondary);
  border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: .75rem 1.2rem; font-size: .9rem; font-weight: 600;
  transition: var(--transition);
}
.toggle-btn:hover { border-color: var(--border-bright); color: var(--text-primary); }
.toggle-btn.active {
  background: rgba(99,102,241,.15); border-color: var(--accent);
  color: var(--accent); box-shadow: 0 0 16px rgba(99,102,241,.15);
}
.toggle-badge { font-size: .68rem; font-weight: 500; color: var(--text-muted); }
.toggle-btn.active .toggle-badge { color: var(--accent); opacity: .8; }

.btn-generate {
  width: 100%; justify-content: center;
  padding: 1rem 2rem; font-size: 1rem;
}
.btn-icon { font-size: 1.1rem; }
.btn-spinner {
  display: none; width: 18px; height: 18px;
  border: 2px solid rgba(255,255,255,.3); border-top-color: #fff;
  border-radius: 50%; animation: spin .8s linear infinite;
  position: absolute;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ========== RESULT CARD ========== */
.result-card {
  background: var(--bg-card); border: 1px solid var(--border-bright);
  border-radius: var(--radius-xl); padding: 2rem 2.4rem;
  box-shadow: var(--shadow-card), var(--shadow-glow);
  animation: fadeSlideIn .4s ease;
}
@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hidden { display: none !important; }

.result-header { display: flex; align-items: flex-start; justify-content: space-between; flex-wrap: wrap; gap: 1rem; margin-bottom: 1.5rem; }
.result-meta { display: flex; flex-wrap: wrap; gap: .5rem; }
.result-badge {
  font-size: .75rem; font-weight: 600; padding: .3rem .8rem;
  border-radius: 99px; background: rgba(99,102,241,.1); color: var(--accent);
  border: 1px solid var(--border);
}
.result-badge-valid {
  display: flex; align-items: center; gap: .3rem;
  background: var(--green-bg); color: var(--green); border-color: rgba(16,185,129,.25);
}
.result-actions { display: flex; gap: .6rem; }
.action-btn {
  display: flex; align-items: center; gap: .4rem;
  font-size: .82rem; font-weight: 600; color: var(--text-secondary);
  background: var(--bg-surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: .5rem 1rem; transition: var(--transition);
}
.action-btn:hover { color: var(--text-primary); border-color: var(--border-bright); }
.action-btn-danger:hover { color: var(--amber); border-color: rgba(245,158,11,.4); }

/* Words Grid */
.words-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: .7rem; margin-bottom: 1.5rem;
  animation: fadeSlideIn .3s ease;
}
.word-chip {
  display: flex; align-items: center; gap: .5rem;
  background: var(--bg-surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: .5rem .8rem;
  font-size: .9rem; transition: var(--transition);
}
.word-chip:hover { border-color: var(--border-bright); }
.word-num {
  font-size: .68rem; font-weight: 700; color: var(--accent);
  font-family: var(--font-mono); min-width: 18px;
}
.word-text { font-family: var(--font-mono); font-size: .88rem; font-weight: 500; }

/* Raw phrase */
.phrase-raw-wrapper { margin-bottom: 1.5rem; }
.phrase-raw-label { font-size: .75rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: .06em; margin-bottom: .5rem; }
.phrase-raw {
  background: var(--bg-surface); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 1rem 1.2rem;
  position: relative; min-height: 3.5rem; display: flex; align-items: center;
}
.phrase-raw.masked .phrase-text {
  filter: blur(8px); user-select: none; pointer-events: none;
}
.phrase-text {
  font-family: var(--font-mono); font-size: .88rem; line-height: 1.8;
  color: var(--text-primary); word-break: break-word; transition: filter .3s ease;
}

/* Warning */
.warning-banner {
  display: flex; gap: .8rem; align-items: flex-start;
  background: rgba(245,158,11,.07); border: 1px solid rgba(245,158,11,.2);
  border-radius: var(--radius-md); padding: 1rem 1.2rem;
  font-size: .85rem; color: #fcd34d;
}
.warning-icon { font-size: 1.1rem; flex-shrink: 0; }
.warning-text strong { display: block; margin-bottom: .2rem; }

/* ========== VALIDATOR ========== */
.validator-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-xl); padding: 2rem 2.4rem;
  box-shadow: var(--shadow-card);
}
.validator-input-group { margin-bottom: 1.2rem; }
.validator-textarea {
  width: 100%; background: var(--bg-surface); color: var(--text-primary);
  border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 1rem 1.2rem; font-size: .9rem; resize: vertical;
  transition: var(--transition); margin-top: .6rem; line-height: 1.7;
}
.validator-textarea:focus { outline: none; border-color: var(--border-bright); }
.word-counter { font-size: .78rem; color: var(--text-muted); text-align: right; margin-top: .4rem; }
.validator-controls { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; margin-bottom: 1.2rem; }

/* Validation result */
.validation-result {
  display: flex; align-items: center; gap: 1rem;
  border-radius: var(--radius-md); padding: 1rem 1.4rem;
  animation: fadeSlideIn .3s ease;
}
.validation-result.valid { background: var(--green-bg); border: 1px solid rgba(16,185,129,.25); }
.validation-result.invalid { background: var(--red-bg); border: 1px solid rgba(239,68,68,.25); }
.vr-icon { font-size: 1.8rem; }
.vr-title { font-size: 1rem; font-weight: 700; margin-bottom: .2rem; }
.validation-result.valid .vr-title { color: var(--green); }
.validation-result.invalid .vr-title { color: var(--red); }
.vr-desc { font-size: .85rem; color: var(--text-secondary); }

/* ========== FEATURES GRID ========== */
.features-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 1.2rem; }
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 1.6rem;
  transition: var(--transition);
}
.feature-card:hover { border-color: var(--border-bright); transform: translateY(-3px); box-shadow: var(--shadow-glow); }
.feature-icon { font-size: 2rem; margin-bottom: .8rem; }
.feature-title { font-size: 1rem; font-weight: 700; margin-bottom: .5rem; }
.feature-desc { font-size: .85rem; color: var(--text-secondary); line-height: 1.7; }
.feature-desc code { color: var(--accent); font-family: var(--font-mono); font-size: .82rem; }

/* ========== FOOTER ========== */
.site-footer {
  position: relative; z-index: 1;
  border-top: 1px solid var(--border); padding: 2.5rem 2rem; text-align: center;
}
.footer-inner { max-width: 880px; margin: 0 auto; }
.footer-logo { font-size: 1.1rem; margin-bottom: .6rem; }
.footer-text { font-size: .85rem; color: var(--text-muted); margin-bottom: .4rem; }
.footer-warning { font-size: .8rem; color: var(--amber); opacity: .7; }

/* ========== TOAST ========== */
.toast {
  position: fixed; bottom: 2rem; right: 2rem; z-index: 999;
  background: var(--bg-card); border: 1px solid var(--border-bright);
  color: var(--text-primary); font-size: .88rem; font-weight: 500;
  padding: .8rem 1.4rem; border-radius: var(--radius-md);
  box-shadow: var(--shadow-card); opacity: 0; pointer-events: none;
  transform: translateY(10px);
  transition: opacity .25s ease, transform .25s ease;
}
.toast.show { opacity: 1; transform: translateY(0); pointer-events: auto; }

/* ========== RESPONSIVE ========== */
@media (max-width: 640px) {
  .site-header { padding: 0 1rem; }
  .nav-links { gap: 0; }
  .nav-link { padding: .4rem .6rem; font-size: .8rem; }
  .hero { padding: 5rem 1.2rem 3rem; }
  .hero-stats { gap: .8rem; }
  .stat-card { padding: 1rem 1.2rem; min-width: 100px; }
  .controls-card, .result-card, .validator-card { padding: 1.4rem; }
  .controls-row { gap: 1.2rem; }
  .result-header { flex-direction: column; }
  .words-grid { grid-template-columns: repeat(3, 1fr); }
  .validator-controls { flex-direction: column; align-items: stretch; }
  .control-select-sm { max-width: 100%; }
  .section { padding: 3.5rem 1.2rem; }
  .features-grid { grid-template-columns: 1fr 1fr; }
}