/* === Theme variables === */
:root {
  --bg: #0f172a;
  --card: rgba(15, 23, 42, 0.75);
  --card-inner: rgba(15, 23, 42, 0.55);
  --text: #e2e8f0;
  --muted: rgba(226, 232, 240, 0.78);
  --accent-weak: #f97316;
  --accent-medium: #facc15;
  --accent-strong: #4ade80;
  --accent-excellent: #38bdf8;
  --border: rgba(148, 163, 184, 0.2);
  --input-bg: rgba(15, 23, 42, 0.6);
  --placeholder: rgba(226, 232, 240, 0.4);
  --shadow: rgba(15, 23, 42, 0.3);
}

/* Light theme */
[data-theme="light"] {
  --bg: #f1f5f9;
  --card: rgba(255, 255, 255, 0.85);
  --card-inner: rgba(241, 245, 249, 0.6);
  --text: #1e293b;
  --muted: rgba(51, 65, 85, 0.78);
  --border: rgba(148, 163, 184, 0.3);
  --input-bg: rgba(241, 245, 249, 0.9);
  --placeholder: rgba(51, 65, 85, 0.4);
  --shadow: rgba(0, 0, 0, 0.08);
}

/* Auto theme */
@media (prefers-color-scheme: light) {
  [data-theme="auto"] {
    --bg: #f1f5f9;
    --card: rgba(255, 255, 255, 0.85);
    --card-inner: rgba(241, 245, 249, 0.6);
    --text: #1e293b;
    --muted: rgba(51, 65, 85, 0.78);
    --border: rgba(148, 163, 184, 0.3);
    --input-bg: rgba(241, 245, 249, 0.9);
    --placeholder: rgba(51, 65, 85, 0.4);
    --shadow: rgba(0, 0, 0, 0.08);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: radial-gradient(circle at 20% 20%, rgba(56, 189, 248, 0.15), transparent 55%),
    radial-gradient(circle at 80% 0%, rgba(129, 140, 248, 0.2), transparent 50%),
    var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 3rem 1.5rem 4rem;
}

.skip-nav {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  padding: 0.5rem 1rem; background: var(--accent-excellent); color: #000;
  font-weight: 600; border-radius: 0 0 8px 8px; text-decoration: none;
}
.skip-nav:focus { left: 50%; transform: translateX(-50%); }

.layout { width: min(960px, 100%); display: grid; gap: 2.5rem; }

/* === Main tabs === */
.main-tabs {
  display: flex; gap: 0.5rem; align-items: center;
}
.main-tab {
  padding: 0.5rem 1.2rem; border-radius: 999px; border: 1px solid var(--border);
  background: transparent; color: var(--muted); font-size: 0.9rem; font-weight: 600;
  cursor: pointer; transition: all 180ms ease;
}
.main-tab.active {
  background: var(--accent-excellent); color: #0f172a; border-color: transparent;
}
.main-tab:hover:not(.active) { border-color: var(--accent-excellent); color: var(--text); }
.btn-history-toggle { margin-left: auto; }

/* === Hero / Analyzer === */
.hero {
  background: var(--card); border: 1px solid var(--border); border-radius: 32px;
  padding: clamp(1.5rem, 3vw, 2.5rem); backdrop-filter: blur(18px);
  box-shadow: 0 40px 80px var(--shadow);
}
.hero h1 { margin-top: 0; font-size: clamp(2rem, 4vw, 2.8rem); line-height: 1.2; }
.hero p { color: var(--muted); font-size: 1.05rem; line-height: 1.7; }

.password-form { display: grid; gap: 1rem; margin-top: 2rem; }
.password-form label { font-weight: 600; letter-spacing: 0.02em; }

.input-wrapper { position: relative; display: flex; flex-direction: column; }
.password-form input[type="password"],
.password-form input[type="text"] {
  font-size: 1.2rem; padding: 0.75rem 6rem 0.75rem 1rem; border-radius: 16px;
  border: 1px solid transparent; background: var(--input-bg); color: inherit;
  transition: border 180ms ease, box-shadow 180ms ease;
}
.password-form input:focus {
  outline: none; border-color: rgba(56, 189, 248, 0.5);
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.15);
}
.password-form input::placeholder { color: var(--placeholder); }

.toggle-visibility {
  position: absolute; inset: 0.35rem 0.6rem auto auto;
  padding: 0.35rem 0.75rem; border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.4); background: var(--card-inner);
  color: var(--muted); font-size: 0.85rem; font-weight: 600; cursor: pointer;
  transition: border 180ms ease, background 180ms ease, color 180ms ease;
}
.toggle-visibility:hover, .toggle-visibility:focus-visible {
  border-color: rgba(56, 189, 248, 0.7); color: var(--text); outline: none;
}

/* Inline strength bar under input */
.inline-strength-bar {
  position: absolute; bottom: 0; left: 0; height: 3px; width: 10%;
  border-radius: 0 0 16px 16px; background-color: #f87171;
  opacity: 0; transition: width 300ms ease, background-color 300ms ease, opacity 200ms ease;
}

.password-actions {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem;
}
.strength-label { margin: 0; color: var(--muted); font-size: 0.95rem; }
.action-buttons { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.btn-action, .btn-primary {
  padding: 0.35rem 0.85rem; border-radius: 999px; border: 1px solid rgba(148, 163, 184, 0.4);
  background: var(--card-inner); color: var(--muted); font-size: 0.82rem; font-weight: 600;
  cursor: pointer; transition: border 180ms ease, background 180ms ease, color 180ms ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent-excellent); color: #0f172a; border-color: transparent;
  font-size: 0.9rem; padding: 0.5rem 1.2rem;
}
.btn-action:hover, .btn-action:focus-visible { border-color: rgba(56, 189, 248, 0.7); color: var(--text); outline: none; }
.btn-primary:hover { opacity: 0.9; }

.btn-icon {
  padding: 0.3rem 0.6rem; border-radius: 999px; border: 1px solid var(--border);
  background: transparent; color: var(--muted); font-size: 0.85rem; font-weight: 600;
  cursor: pointer; transition: all 180ms ease; text-decoration: none;
}
.btn-icon:hover { border-color: var(--accent-excellent); color: var(--text); }

/* === Badges === */
.badges-row { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 0.25rem; }
.badge {
  display: inline-flex; align-items: center; padding: 0.3rem 0.75rem; border-radius: 999px;
  font-size: 0.8rem; font-weight: 600; cursor: default;
}
.badge-checking { background: rgba(148, 163, 184, 0.2); color: var(--muted); }
.badge-breach-safe { background: rgba(74, 222, 128, 0.15); color: #4ade80; border: 1px solid rgba(74, 222, 128, 0.3); }
.badge-breach-found { background: rgba(248, 113, 113, 0.15); color: #f87171; border: 1px solid rgba(248, 113, 113, 0.3); }
.badge-unavailable { background: rgba(148, 163, 184, 0.1); color: var(--muted); }
.badge-nist-ok { background: rgba(56, 189, 248, 0.15); color: #38bdf8; border: 1px solid rgba(56, 189, 248, 0.3); }
.badge-nist-fail { background: rgba(249, 115, 22, 0.15); color: #f97316; border: 1px solid rgba(249, 115, 22, 0.3); }

/* === Analysis === */
.analysis {
  background: var(--card); border: 1px solid var(--border); border-radius: 32px;
  padding: clamp(1.5rem, 3vw, 2.5rem); display: grid; gap: 2rem;
  backdrop-filter: blur(16px); box-shadow: 0 30px 80px var(--shadow);
  opacity: 0; transform: translateY(12px);
  transition: opacity 300ms ease, transform 300ms ease; pointer-events: none;
}
.analysis.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }

.meter { position: relative; width: 100%; height: 12px; border-radius: 999px; background: rgba(148, 163, 184, 0.2); overflow: hidden; }
.meter-fill {
  position: absolute; inset: 0; width: 20%; transform: scaleX(0.1); transform-origin: left;
  border-radius: inherit; background: linear-gradient(90deg, #f87171, #f97316, #facc15, #4ade80, #38bdf8);
  transition: transform 360ms cubic-bezier(0.16, 1, 0.3, 1);
}
.meter-fill[data-strength='1'] { transform: scaleX(0.2); }
.meter-fill[data-strength='2'] { transform: scaleX(0.4); }
.meter-fill[data-strength='3'] { transform: scaleX(0.7); }
.meter-fill[data-strength='4'] { transform: scaleX(1); }

.stats { display: grid; gap: 1.5rem; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.stat {
  background: var(--card-inner); border-radius: 24px; border: 1px solid rgba(148, 163, 184, 0.25);
  padding: 1.5rem; min-height: 120px; transition: border 200ms ease;
}
.stat:hover { border-color: rgba(56, 189, 248, 0.45); }
.stat h2 { margin: 0 0 0.5rem; font-size: 1.1rem; }
.stat-value { margin: 0; font-size: 1.75rem; font-weight: 700; }
.stat-value.skeleton {
  background: linear-gradient(90deg, transparent 30%, rgba(148, 163, 184, 0.15) 50%, transparent 70%);
  background-size: 200% 100%; animation: shimmer 1.2s ease infinite;
  border-radius: 8px; color: transparent; min-width: 80px; min-height: 1.75rem;
}
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
.stat-sub { margin: 0.75rem 0 0; font-size: 0.85rem; color: var(--muted); }

.lists { display: grid; gap: 1.5rem; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.list { margin: 0; padding: 0; list-style: none; display: grid; gap: 0.75rem; }
.list li {
  background: var(--card-inner); border-radius: 18px; padding: 1rem 1.25rem;
  border: 1px solid rgba(148, 163, 184, 0.2); position: relative; overflow: hidden;
}
.list li::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(120deg, rgba(56, 189, 248, 0.12), transparent 60%);
  opacity: 0; transition: opacity 240ms ease;
}
.list li:hover::before { opacity: 1; }

/* === Recommendations === */
.recommendations { display: grid; gap: 1rem; }
.recommendations h2 { margin: 0; font-size: 1.2rem; }
.recommendations-list { display: grid; gap: 0.75rem; }
.recommendation-card {
  background: var(--card-inner); border: 1px solid var(--border); border-radius: 18px;
  padding: 1rem 1.25rem; display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem;
}
.rec-tip { margin: 0; flex: 1 1 100%; font-size: 0.9rem; color: var(--muted); }
.rec-example {
  margin: 0; font-family: monospace; font-size: 0.95rem; padding: 0.3rem 0.6rem;
  background: rgba(148, 163, 184, 0.1); border-radius: 8px; word-break: break-all;
}
.rec-gain {
  font-size: 0.8rem; font-weight: 700; color: #4ade80; padding: 0.2rem 0.5rem;
  background: rgba(74, 222, 128, 0.1); border-radius: 999px;
}

/* === Generator panel === */
.generator-panel {
  background: var(--card); border: 1px solid var(--border); border-radius: 32px;
  padding: clamp(1.5rem, 3vw, 2.5rem); backdrop-filter: blur(18px);
  box-shadow: 0 30px 80px var(--shadow); display: grid; gap: 1.5rem;
}
.generator-panel h2 { margin: 0; }

.gen-tabs { display: flex; gap: 0.5rem; }
.gen-tab {
  padding: 0.4rem 1rem; border-radius: 999px; border: 1px solid var(--border);
  background: transparent; color: var(--muted); font-size: 0.85rem; font-weight: 600;
  cursor: pointer; transition: all 180ms ease;
}
.gen-tab.active { background: var(--accent-excellent); color: #0f172a; border-color: transparent; }
.gen-tab:hover:not(.active) { border-color: var(--accent-excellent); }

.gen-mode { display: grid; gap: 1rem; }
.gen-control { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.gen-control label { font-weight: 600; font-size: 0.9rem; min-width: 140px; }
.gen-control input[type="range"] { flex: 1; min-width: 120px; accent-color: var(--accent-excellent); }
.gen-control select {
  padding: 0.4rem 0.8rem; border-radius: 12px; border: 1px solid var(--border);
  background: var(--input-bg); color: var(--text); font-size: 0.85rem;
}

.gen-toggles { display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem; }
.gen-toggles label {
  display: flex; align-items: center; gap: 0.4rem; font-size: 0.9rem; cursor: pointer;
}
.gen-toggles input[type="checkbox"] { accent-color: var(--accent-excellent); width: 18px; height: 18px; }

.mnemonic-tip {
  font-style: italic; color: var(--muted); font-size: 0.9rem;
  padding: 0.75rem 1rem; background: var(--card-inner); border-radius: 14px;
  border: 1px solid var(--border);
}

.gen-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.batch-results {
  list-style: none; margin: 0; padding: 0; display: grid; gap: 0.5rem;
}
.batch-item {
  display: flex; align-items: center; gap: 0.5rem; padding: 0.75rem 1rem;
  background: var(--card-inner); border: 1px solid var(--border); border-radius: 14px;
  flex-wrap: wrap;
}
.batch-password { flex: 1; font-family: monospace; font-size: 0.9rem; word-break: break-all; }
.batch-copy, .batch-use { font-size: 0.75rem; padding: 0.25rem 0.6rem; }

/* === History sidebar === */
.history-sidebar {
  position: fixed; top: 0; right: 0; width: 320px; height: 100vh;
  background: var(--card); border-left: 1px solid var(--border);
  backdrop-filter: blur(20px); z-index: 50; padding: 1.5rem;
  transform: translateX(100%); transition: transform 300ms ease;
  display: flex; flex-direction: column; gap: 1rem; overflow-y: auto;
}
.history-sidebar.open { transform: translateX(0); }
.history-header { display: flex; justify-content: space-between; align-items: center; }
.history-header h2 { margin: 0; font-size: 1.2rem; }
.history-actions { display: flex; gap: 0.3rem; }
.history-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.5rem; }
.history-empty { color: var(--muted); font-size: 0.9rem; }
.history-item {
  display: flex; justify-content: space-between; align-items: center; gap: 0.5rem;
  padding: 0.75rem; background: var(--card-inner); border: 1px solid var(--border);
  border-radius: 14px;
}
.history-info { display: flex; flex-direction: column; gap: 0.2rem; min-width: 0; flex: 1; }
.history-pw { font-family: monospace; font-size: 0.85rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.history-meta { font-size: 0.75rem; color: var(--muted); }

/* === FAQ === */
.faq {
  background: var(--card); border: 1px solid var(--border); border-radius: 28px;
  padding: clamp(1.5rem, 3vw, 2.5rem); backdrop-filter: blur(14px);
  box-shadow: 0 24px 60px var(--shadow); display: grid; gap: 0.75rem;
}
.faq h2 { margin: 0 0 0.5rem; font-size: 1.35rem; }
.faq-item {
  background: var(--card-inner); border: 1px solid var(--border); border-radius: 16px;
  overflow: hidden; transition: border 200ms ease;
}
.faq-item:hover { border-color: rgba(56, 189, 248, 0.3); }
.faq-item summary {
  padding: 1rem 1.25rem; font-weight: 600; font-size: 0.95rem; cursor: pointer;
  list-style: none; display: flex; align-items: center; gap: 0.5rem;
}
.faq-item summary::before { content: '+'; font-size: 1.2rem; color: var(--accent-excellent); flex-shrink: 0; }
.faq-item[open] summary::before { content: '\2212'; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item p { margin: 0; padding: 0 1.25rem 1rem; font-size: 0.9rem; line-height: 1.6; color: var(--muted); }

/* === Education === */
.education {
  display: grid; gap: 1.5rem; background: var(--card); border: 1px solid var(--border);
  border-radius: 28px; padding: clamp(1.5rem, 3vw, 2.5rem); backdrop-filter: blur(14px);
  box-shadow: 0 24px 60px var(--shadow);
}
.education-card {
  background: var(--card-inner); border: 1px solid rgba(148, 163, 184, 0.2); border-radius: 20px;
  padding: clamp(1.25rem, 3vw, 1.8rem); display: grid; gap: 0.75rem;
}
.education-card h2 { margin: 0; font-size: 1.35rem; }
.education-card ul {
  margin: 0; padding-left: 1.2rem; display: grid; gap: 0.65rem;
  color: var(--muted); font-size: 0.95rem; line-height: 1.6;
}
.education-card li::marker { color: var(--accent-excellent); }

/* === Footer === */
.footer {
  margin-top: 3rem; max-width: min(720px, 90vw); text-align: center;
  color: var(--muted); font-size: 0.95rem; line-height: 1.6;
}
.footer-controls { display: flex; justify-content: center; gap: 0.75rem; margin-top: 1rem; }
.footer-link { text-decoration: none; }

/* === Trainer modal === */
.modal-overlay {
  position: fixed; inset: 0; z-index: 100; background: rgba(0, 0, 0, 0.6);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: opacity 250ms ease;
}
.modal-overlay.open { opacity: 1; pointer-events: auto; }
.modal-content {
  background: var(--card); border: 1px solid var(--border); border-radius: 24px;
  padding: 2rem; max-width: 500px; width: 90%; backdrop-filter: blur(20px);
  display: grid; gap: 1rem;
}
.modal-header { display: flex; justify-content: space-between; align-items: center; }
.modal-header h2 { margin: 0; font-size: 1.3rem; }
.trainer-display {
  font-family: monospace; font-size: 1.5rem; text-align: center;
  padding: 1rem; background: var(--card-inner); border-radius: 14px;
  word-break: break-all;
}
.trainer-chars {
  display: flex; flex-wrap: wrap; gap: 2px; justify-content: center;
  font-family: monospace; font-size: 1.2rem;
}
.char-correct { color: #4ade80; }
.char-wrong { color: #f87171; }
.char-missing { color: var(--muted); }
.trainer-input {
  padding: 0.75rem 1rem; border-radius: 14px; border: 1px solid var(--border);
  background: var(--input-bg); color: var(--text); font-size: 1.1rem;
  font-family: monospace; text-align: center;
}
.trainer-input:focus { outline: none; border-color: rgba(56, 189, 248, 0.5); }
.trainer-result { margin: 0; text-align: center; font-weight: 600; font-size: 0.95rem; }

/* === Responsive === */
@media (max-width: 720px) {
  body { padding: 2rem 1rem 3rem; }
  .hero, .analysis, .generator-panel { border-radius: 24px; }
  .password-actions { flex-direction: column; align-items: flex-start; }
  .main-tabs { flex-wrap: wrap; }
  .history-sidebar { width: 100%; }
}

@media (min-width: 900px) {
  .education { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important; animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important; scroll-behavior: auto !important;
  }
}