/* ===== Design Tokens ===== */
:root {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.25rem);

  /* Spacing (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 640px;
  --content-default: 880px;
  --content-wide: 1120px;

  --font-display: 'Cabinet Grotesk', 'General Sans', sans-serif;
  --font-body: 'Satoshi', 'General Sans', sans-serif;
}

/* ===== Color — cool "security tech" palette ===== */
:root,
[data-theme='light'] {
  --color-bg: #f4f7fa;
  --color-surface: #ffffff;
  --color-surface-2: #fbfdfe;
  --color-surface-offset: #eaf0f5;
  --color-divider: #dfe6ec;
  --color-border: #d2dbe3;

  --color-text: #101820;
  --color-text-muted: #596674;
  --color-text-faint: #9aa7b4;
  --color-text-inverse: #f5f9fb;

  --color-primary: #0a8fa0;
  --color-primary-hover: #077487;
  --color-primary-active: #065b6a;
  --color-primary-highlight: #d4eef2;

  --color-safe: #158a4c;
  --color-safe-highlight: #d9f0e1;
  --color-caution: #b5750a;
  --color-caution-highlight: #f6e6c8;
  --color-danger: #c02b3a;
  --color-danger-highlight: #f6d9dc;

  --shadow-sm: 0 1px 2px rgba(16, 24, 32, 0.06);
  --shadow-md: 0 6px 20px rgba(16, 24, 32, 0.08);
  --shadow-lg: 0 20px 48px rgba(16, 24, 32, 0.14);
}

[data-theme='dark'] {
  --color-bg: #0a1016;
  --color-surface: #10181f;
  --color-surface-2: #141e26;
  --color-surface-offset: #182430;
  --color-divider: #1e2b37;
  --color-border: #263643;

  --color-text: #e7eef3;
  --color-text-muted: #97a6b3;
  --color-text-faint: #5c6b78;
  --color-text-inverse: #0a1016;

  --color-primary: #35d0e0;
  --color-primary-hover: #5fdbe8;
  --color-primary-active: #22b6c6;
  --color-primary-highlight: #16333a;

  --color-safe: #4ade80;
  --color-safe-highlight: #163425;
  --color-caution: #fbbf24;
  --color-caution-highlight: #362a10;
  --color-danger: #f87171;
  --color-danger-highlight: #3a1a1e;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.5);
}

/* ===== Layout helpers ===== */
.wrap {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-5);
}
.narrow {
  max-width: var(--content-narrow);
  margin-inline: auto;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-divider);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}
.brand svg {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
  flex-shrink: 0;
}
.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.theme-toggle {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.theme-toggle:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.theme-toggle svg {
  width: 18px;
  height: 18px;
}

/* ===== Hero ===== */
.hero {
  padding-block: clamp(var(--space-12), 8vw, var(--space-20)) var(--space-8);
  text-align: center;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-5);
}
.hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-2xl);
  letter-spacing: -0.015em;
  max-width: 18ch;
  margin-inline: auto;
  margin-bottom: var(--space-4);
}
.hero h1 em {
  font-style: normal;
  color: var(--color-primary);
}
.hero p {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 46ch;
  margin-inline: auto;
}

/* ===== Tool card ===== */
.tool-section {
  padding-block: var(--space-8) var(--space-16);
}
.tool-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.tabs {
  display: flex;
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface-offset);
}
.tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
}
.tab-btn svg {
  width: 18px;
  height: 18px;
}
.tab-btn:hover {
  color: var(--color-text);
}
.tab-btn[aria-selected='true'] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  background: var(--color-surface);
}
.tab-panels {
  padding: clamp(var(--space-6), 5vw, var(--space-10));
}
.tab-panel {
  display: none;
}
.tab-panel.active {
  display: block;
}
.panel-hint {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-5);
  text-align: center;
}

/* Camera */
.camera-stage {
  position: relative;
  width: 100%;
  max-width: 420px;
  margin: 0 auto var(--space-5);
  aspect-ratio: 1;
  background: var(--color-surface-offset);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.camera-stage video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.camera-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-faint);
  text-align: center;
  padding: var(--space-6);
}
.camera-placeholder svg {
  width: 48px;
  height: 48px;
}
.scan-frame {
  position: absolute;
  inset: 12%;
  border-radius: var(--radius-md);
  pointer-events: none;
}
.scan-frame::before,
.scan-frame::after,
.scan-frame > span::before,
.scan-frame > span::after {
  content: '';
  position: absolute;
  width: 28px;
  height: 28px;
  border: 3px solid var(--color-primary);
}
.scan-frame::before {
  top: 0;
  left: 0;
  border-right: none;
  border-bottom: none;
  border-top-left-radius: var(--radius-sm);
}
.scan-frame::after {
  top: 0;
  right: 0;
  border-left: none;
  border-bottom: none;
  border-top-right-radius: var(--radius-sm);
}
.scan-frame > span::before {
  bottom: 0;
  left: 0;
  border-right: none;
  border-top: none;
  border-bottom-left-radius: var(--radius-sm);
}
.scan-frame > span::after {
  bottom: 0;
  right: 0;
  border-left: none;
  border-top: none;
  border-bottom-right-radius: var(--radius-sm);
}
.camera-controls {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
}
.camera-status {
  text-align: center;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-3);
  min-height: 1.4em;
}

/* Upload */
.dropzone {
  display: block;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-10) var(--space-6);
  text-align: center;
  color: var(--color-text-muted);
  cursor: pointer;
  max-width: 420px;
  margin: 0 auto;
}
.dropzone:hover,
.dropzone.dragover {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
  color: var(--color-text);
}
.dropzone svg {
  width: 40px;
  height: 40px;
  margin: 0 auto var(--space-3);
  color: var(--color-primary);
}
.dropzone strong {
  color: var(--color-text);
}
.dropzone input {
  display: none;
}
.upload-preview {
  max-width: 420px;
  margin: var(--space-5) auto 0;
  text-align: center;
}
.upload-preview img {
  max-height: 220px;
  margin: 0 auto var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

/* Paste */
.paste-form {
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  gap: var(--space-3);
}
.paste-form input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  font-size: var(--text-base);
}
.paste-form input:focus-visible {
  border-color: var(--color-primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
}
.btn svg {
  width: 16px;
  height: 16px;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
}
.btn-secondary {
  background: var(--color-surface-offset);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.btn-ghost {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  padding: var(--space-2) var(--space-3);
  text-decoration: underline;
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.btn-block {
  width: 100%;
}

/* Loading */
.loading-state {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-10) 0;
  text-align: center;
  color: var(--color-text-muted);
}
.loading-state.active {
  display: flex;
}
.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===== Result panel ===== */
.result-panel {
  display: none;
}
.result-panel.active {
  display: block;
}
.verdict-banner {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-6);
}
.verdict-banner .icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: var(--radius-full);
  display: grid;
  place-items: center;
}
.verdict-banner .icon svg {
  width: 24px;
  height: 24px;
}
.verdict-banner h2 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  margin-bottom: var(--space-1);
}
.verdict-banner p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}
.verdict-banner.safe {
  background: var(--color-safe-highlight);
}
.verdict-banner.safe .icon {
  background: var(--color-safe);
  color: var(--color-text-inverse);
}
.verdict-banner.safe h2 {
  color: var(--color-safe);
}
.verdict-banner.caution {
  background: var(--color-caution-highlight);
}
.verdict-banner.caution .icon {
  background: var(--color-caution);
  color: var(--color-text-inverse);
}
.verdict-banner.caution h2 {
  color: var(--color-caution);
}
.verdict-banner.dangerous {
  background: var(--color-danger-highlight);
}
.verdict-banner.dangerous .icon {
  background: var(--color-danger);
  color: var(--color-text-inverse);
}
.verdict-banner.dangerous h2 {
  color: var(--color-danger);
}

.destination-box {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  margin-bottom: var(--space-5);
}
.destination-box .label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-1);
}
.destination-box .url {
  font-size: var(--text-sm);
  word-break: break-all;
  color: var(--color-text);
}

.reasons-list {
  margin-bottom: var(--space-6);
}
.reasons-list li {
  display: flex;
  gap: var(--space-3);
  padding-block: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text);
}
.reasons-list li svg {
  width: 16px;
  height: 16px;
  margin-top: 3px;
  flex-shrink: 0;
  color: var(--color-text-faint);
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

/* ===== How it works ===== */
.how-section {
  padding-block: var(--space-16);
  border-top: 1px solid var(--color-divider);
}
.how-section h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  text-align: center;
  margin-bottom: var(--space-10);
}
.how-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}
.how-step {
  text-align: center;
}
.how-step .num {
  width: 40px;
  height: 40px;
  margin: 0 auto var(--space-4);
  border-radius: var(--radius-full);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 700;
}
.how-step h3 {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-2);
}
.how-step p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-inline: auto;
}

/* ===== Disclaimer ===== */
.disclaimer {
  background: var(--color-surface-offset);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
  padding-block: var(--space-8);
}
.disclaimer .wrap {
  max-width: var(--content-narrow);
}
.disclaimer p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-align: center;
}

/* ===== Footer ===== */
.site-footer {
  padding-block: var(--space-10);
  text-align: center;
}
.site-footer p {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-inline: auto;
}

/* ===== Responsive ===== */
@media (max-width: 720px) {
  .how-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  .tab-btn span.label {
    display: none;
  }
  .paste-form {
    flex-direction: column;
  }
}