:root {
  --bg:           #0e1117;
  --surface:      #171619;
  --card:         #2e2c33;
  --card-border:  #45424c;
  --card-border2: #5c5866;
  --accent:       #906fe5;
  --accent-dim:   rgba(144, 111, 229, 0.12);
  --accent-glow:  rgba(144, 111, 229, 0.25);
  --accent2:      #a07cff;
  --amber:        #FBC02D;
  --amber-dim:    rgba(251, 192, 45, 0.1);
  --red:          #cc2b22;
  --red-dim:      rgba(204, 43, 34, 0.1);

  --text:         #e6deff;
  --text-muted:   #a19bb2;
  --text-dim:     #736f7f;

  --font-body:    'Roboto', 'Inter', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', monospace;
  
  --max-w:        100%;
  --radius-sm:    8px;
  --radius-md:    12px;
  --radius-lg:    16px;
  --radius-full:  9999px;

  /* Transitions */
  --ease:         cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce:  cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* LIGHT MODE OVERRIDE */
body.light-mode {
  --bg:           #f0f2f5;
  --surface:      #ffffff;
  --card:         #ffffff;
  --card-border:  #d8dce8;
  --card-border2: #c2c8d8;
  --text:         #1a1f2e;
  --text-muted:   #5a6380;
  --text-dim:     #9aa0b4;
}

/* THEME TOGGLE BUTTON */
.theme-toggle {
  background: none;
  border: 1px solid var(--card-border2);
  border-radius: var(--radius-full);
  color: var(--text-muted);
  padding: 6px 12px;
  font-size: 1.2rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s, border-color 0.2s;
}
.theme-toggle:hover {
  color: var(--text);
  border-color: var(--accent);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: var(--font-body);
  cursor: pointer;
}

/* BACKGROUND EFFECTS */

/* Subtle dot-grid pattern */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 28px 28px;
}

/* Top-left ambient glow — green on create page */
.bg-glow {
  position: fixed;
  top: -200px;
  left: -200px;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,200,150,0.06) 0%, transparent 70%);
  z-index: 0;
  pointer-events: none;
}

/* Slightly blue-tinted glow for read page */
.bg-glow--read {
  background: radial-gradient(circle, rgba(100,130,255,0.06) 0%, transparent 70%);
  top: -150px;
  right: -150px;
  left: auto;
}

/* PAGE WRAPPER */
.page-wrapper {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px 80px;
}

/* Centered layout variant — used on read.html */
.page-wrapper--centered {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* HEADER */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 0 50px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
  transition: opacity 0.2s;
}
.logo:hover { opacity: 0.85; }

.logo-icon {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), #a07cff);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 0 18px var(--accent-glow);
  flex-shrink: 0;
}

.logo-accent {
  color: var(--accent);
}

/* Nav links */
.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-link:hover { color: var(--text); }

/* HERO SECTION (index.html only) */
.hero {
  text-align: center;
  margin-bottom: 40px;
}

/* Small pill badge above the title */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 14px;
  background: var(--accent-dim);
  border: 1px solid rgba(0,200,150,0.2);
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 22px;
}

/* Main headline */
.hero-title {
  font-size: clamp(2.1rem, 6vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 1.08;
  color: var(--text);
  margin-bottom: 16px;
}

/* Highlighted/gradient word(s) in title */
.hero-highlight {
  background: linear-gradient(135deg, var(--accent) 0%, #a07cff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 420px;
  margin: 0 auto;
}
.hero-subtitle em {
  font-style: normal;
  color: var(--accent);
  font-weight: 500;
}

/* CARD */
.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  position: relative;
  overflow: hidden;

  /* Entry animation */
  animation: slideUp 0.45s var(--ease-bounce) both;
}

/* Top shimmer line on card */
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(0,200,150,0.4) 50%,
    transparent 100%
  );
  pointer-events: none;
}

/* STEP LABELS */
.step-label,
.section-divider {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.section-divider {
  margin: 24px 0 20px;
  padding-top: 24px;
  border-top: 1px solid var(--card-border);
}

/* The numbered circle in step labels */
.step-number {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-dim);
  border: 1px solid rgba(0,200,150,0.3);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
}

/* FORM FIELDS */
.field {
  margin-bottom: 20px;
}

/* Label row with optional right-side text */
.field-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
}

/* Small badge next to label (e.g. "optional") */
.label-badge {
  display: inline-block;
  padding: 1px 7px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--card-border2);
  border-radius: var(--radius-full);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  margin-left: 7px;
  vertical-align: middle;
  text-transform: none;
}

/* Character counter (right side of textarea label) */
.char-count {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
  transition: color 0.2s;
}
.char-count.warn  { color: var(--amber); }
.char-count.over  { color: var(--red); }

/* INPUTS */
textarea,
input[type="password"],
input[type="text"],
input[type="email"],
select {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 13px 16px;
  outline: none;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
  appearance: none;
  -webkit-appearance: none;
}

/* Focused state */
textarea:focus,
input:focus,
select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,200,150,0.14);
}

/* Textarea uses monospace for code-like feel */
textarea {
  resize: vertical;
  min-height: 150px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.7;
}

/* Placeholder text colour */
::placeholder { color: var(--text-dim); }

/* INPUT WITH ICON (password toggle) */
.input-with-icon {
  position: relative;
}
.input-with-icon input {
  padding-right: 46px;
}

/* Small icon button inside an input */
.icon-btn {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  transition: color 0.2s;
  border-radius: 4px;
}
.icon-btn:hover { color: var(--text); }

/* ── SELECT WRAPPER (custom arrow) */
.select-wrap {
  position: relative;
}
.select-wrap select {
  padding-right: 40px;
  cursor: pointer;
}
/* The little chevron SVG inside select-wrap */
.select-chevron {
  position: absolute;
  right: 13px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--text-dim);
}
select option {
  background: var(--card);
  color: var(--text);
}

/* TWO-COLUMN OPTIONS LAYOUT */
.options-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* PASSWORD STRENGTH INDICATOR */
.strength-bar {
  display: flex;
  gap: 5px;
  margin-top: 8px;
}
.strength-pip {
  flex: 1;
  height: 3px;
  border-radius: 2px;
  background: var(--card-border2);
  transition: background 0.3s var(--ease);
  display: block;
}
/* Strength pip colour states — set via JS */
.strength-pip.s-weak   { background: var(--red); }
.strength-pip.s-fair   { background: var(--amber); }
.strength-pip.s-strong { background: var(--accent); }

.strength-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  margin-top: 5px;
  color: var(--text-dim);
  letter-spacing: 0.04em;
  min-height: 16px;
  transition: color 0.3s;
}

/* ALERTS */
.alert {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 0.84rem;
  line-height: 1.55;
  margin-bottom: 20px;
}
.alert svg {
  flex-shrink: 0;
  margin-top: 2px;
}
.alert strong { font-weight: 600; }

/* Amber / warning alert */
.alert-warn {
  background: var(--amber-dim);
  border: 1px solid rgba(245,166,35,0.2);
  color: #c9974a;
}
.alert-warn svg { color: var(--amber); }
.alert-warn strong { color: var(--amber); }

/* Red / error alert */
.alert-error {
  background: var(--red-dim);
  border: 1px solid rgba(245,101,101,0.2);
  color: #d9706f;
}
.alert-error svg { color: var(--red); }
.alert-error strong { color: var(--red); }

/* BUTTONS */

/* Primary CTA button */
.btn-primary {
  width: 100%;
  padding: 15px 24px;
  background: linear-gradient(135deg, var(--accent) 0%, #a07cff 100%);
  border: none;
  border-radius: var(--radius-md);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: opacity 0.2s, transform 0.15s, box-shadow 0.2s;
  box-shadow: 0 4px 22px rgba(0,200,150,0.3);
  text-decoration: none;
}
.btn-primary:hover:not(:disabled) {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 6px 28px rgba(0,200,150,0.4);
}
.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 2px 12px rgba(0,200,150,0.25);
}
.btn-primary:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
}

/* Secondary button */
.btn-secondary {
  padding: 10px 18px;
  background: var(--surface);
  border: 1px solid var(--card-border2);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: border-color 0.2s, background 0.2s;
  text-decoration: none;
}
.btn-secondary:hover {
  border-color: var(--accent);
  background: rgba(0,200,150,0.05);
}

/* Ghost / text-like button */
.btn-ghost {
  padding: 10px 16px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s;
  text-decoration: none;
}
.btn-ghost:hover { color: var(--text); }

/* ── BUTTON LOADING SPINNER ──────────────────────────────────── */
.btn-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

/* SUCCESS BOX (appears after note created)  */
.success-box {
  background: rgba(0,200,150,0.05);
  border: 1px solid rgba(0,200,150,0.2);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-top: 20px;
  animation: slideUp 0.35s var(--ease-bounce) both;
}

.success-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

/* The generated link display */
.link-display {
  background: var(--surface);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent2);
  word-break: break-all;
  line-height: 1.55;
  user-select: all;   /* lets the user select all with one click */
}

.success-actions {
  display: flex;
  gap: 10px;
  margin-top: 14px;
  flex-wrap: wrap;
}

/* Burn notice at bottom of success box */
.burn-notice {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding: 10px 12px;
  background: rgba(245,101,101,0.06);
  border: 1px solid rgba(245,101,101,0.18);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: #c9706f;
}
.burn-notice svg { color: var(--red); flex-shrink: 0; }

/* HOW IT WORKS SECTION */
.how-it-works {
  margin-top: 64px;
  text-align: center;
}

.section-title {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 32px;
}

/* 4-column step cards */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  text-align: left;
}

.step-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 20px 18px;
  transition: border-color 0.2s, transform 0.2s;
}
.step-card:hover {
  border-color: var(--card-border2);
  transform: translateY(-2px);
}

/* Icon circle for each step */
.step-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}
.step-icon--write   { background: rgba(100,130,255,0.1); color: #906fe5; }
.step-icon--encrypt { background: var(--accent-dim);      color: var(--accent); }
.step-icon--share   { background: rgba(180,130,255,0.1); color: #a07cff; }
.step-icon--burn    { background: rgba(245,101,101,0.1); color: var(--red); }

.step-card h3 {
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
  color: var(--text);
}
.step-card p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* READ PAGE STATES */
.read-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px 0;
}

/* Each state is a centered card-like block */
.read-state {
  width: 100%;
  max-width: 520px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  text-align: center;
  position: relative;
  overflow: hidden;
  animation: slideUp 0.45s var(--ease-bounce) both;
}

/* Top shimmer on read states */
.read-state::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,200,150,0.35), transparent);
  pointer-events: none;
}

/* State icon circle */
.state-icon {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 22px;
}

/* State icon colour variants */
.state-icon--spin    { background: rgba(255,255,255,0.04); color: var(--text-muted); animation: spin 1.2s linear infinite; }
.state-icon--lock    { background: rgba(100,130,255,0.1); color: #906fe5; }
.state-icon--success { background: var(--accent-dim);      color: var(--accent); }
.state-icon--flame   { background: rgba(245,166,35,0.1);  color: var(--amber); }
.state-icon--error   { background: var(--red-dim);         color: var(--red); }

.read-state h2 {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 10px;
}
.read-state p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* The revealed message box */
.message-box, .password-box,
.paste-box, .note-box {
  background: var(--surface);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
  text-align: left;
  margin: 22px 0 18px;
  animation: slideUp 0.3s var(--ease) both;
}

.revealed-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 4px;
}

/* FOOTER */
.site-footer {
  margin-top: 60px;
  padding: 20px 0;
  border-top: 1px solid var(--card-border);
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  margin: 0 4px;
  transition: color 0.2s;
}
.footer-link:hover { color: var(--text); }
.author-link {
  color: var(--amber);
}

/* UTILITY CLASSES */

/* Hide elements — JS removes this class to show them */
.hidden { display: none !important; }

/* KEYFRAME ANIMATIONS */
@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* RESPONSIVE: TABLET */
@media (max-width: 680px) {
  .steps-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* RESPONSIVE: MOBILE */
@media (max-width: 480px) {
  /* Tighter horizontal padding */
  .page-wrapper { padding: 0 16px 60px; }
  .card { padding: 22px 18px; }
  .read-state { padding: 30px 20px; }

  /* Stack the options (password + expiry) vertically */
  .options-row { grid-template-columns: 1fr; }

  /* Stack the steps 1 per row */
  .steps-grid { grid-template-columns: 1fr; }

  /* Hero */
  .hero-title { font-size: 2rem; }
  .hero-subtitle { font-size: 0.9rem; }

  /* Success actions stack */
  .success-actions { flex-direction: column; }

  /* Header nav hide on tiny screens */
  .site-nav { display: none; }
}
/* desktop responsiveness */
@media (min-width: 1280px) {
  .page-wrapper {
    max-width: 1200px;
  }
}