/* ============================================
   YOSI CLINICAL TOOLS — MAIN STYLESHEET
   Palette: Medical blue-navy + clinical teal
   ============================================ */

/* ——— FONTS ——— */
@import url('https://api.fontshare.com/v2/css?f[]=cabinet-grotesk@400,500,700,800&f[]=satoshi@400,500,700&display=swap');

/* ——— DESIGN TOKENS ——— */
:root,
[data-theme='light'] {
  /* Surfaces */
  --color-bg: #f4f7fb;
  --color-surface: #ffffff;
  --color-surface-2: #f8fafd;
  --color-surface-offset: #eef2f8;
  --color-surface-offset-2: #e4eaf4;
  --color-surface-dynamic: #d8e2f0;
  --color-divider: #d0daea;
  --color-border: #c4d0e4;

  /* Text */
  --color-text: #1a2236;
  --color-text-muted: #5a6a8a;
  --color-text-faint: #9aaac4;
  --color-text-inverse: #f4f7fb;

  /* Primary — Medical Teal */
  --color-primary: #0a6e78;
  --color-primary-hover: #095e67;
  --color-primary-active: #074d55;
  --color-primary-highlight: #cce8eb;
  --color-primary-subtle: #e6f4f5;

  /* Navy accent */
  --color-navy: #1a3460;
  --color-navy-light: #2a4a80;

  /* Status */
  --color-success: #1e7a3e;
  --color-success-bg: #e8f5ec;
  --color-warning: #9a5a00;
  --color-warning-bg: #fff5e0;
  --color-tip: #5a3a9a;
  --color-tip-bg: #f0ecfa;
  --color-orange: #c85000;
  --color-orange-bg: #fff0e6;
  --color-purple: #6a3abf;
  --color-purple-bg: #f2eeff;
  --color-gold: #9a7200;
  --color-gold-bg: #fff8e0;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.875rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(20, 40, 80, 0.08);
  --shadow-md: 0 4px 16px rgba(20, 40, 80, 0.1);
  --shadow-lg: 0 12px 40px rgba(20, 40, 80, 0.12);
  --shadow-card: 0 2px 8px rgba(20, 40, 80, 0.07), 0 0 0 1px rgba(20, 40, 80, 0.05);
  --shadow-card-hover: 0 8px 24px rgba(20, 40, 80, 0.12), 0 0 0 1px rgba(10, 110, 120, 0.15);

  /* Transitions */
  --transition: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Spacing */
  --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;

  /* 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);

  /* Fonts */
  --font-display: 'Cabinet Grotesk', 'Helvetica Neue', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;

  /* Layout */
  --content-default: 1100px;
  --header-height: 64px;
}

[data-theme='dark'] {
  --color-bg: #0f1522;
  --color-surface: #151e2e;
  --color-surface-2: #1a2538;
  --color-surface-offset: #1e2a40;
  --color-surface-offset-2: #222f48;
  --color-surface-dynamic: #2a3850;
  --color-divider: #2a3652;
  --color-border: #334060;
  --color-text: #d0daf0;
  --color-text-muted: #7a90b8;
  --color-text-faint: #4a5e80;
  --color-text-inverse: #0f1522;
  --color-primary: #3eb8c5;
  --color-primary-hover: #2ea4b0;
  --color-primary-active: #1e8c98;
  --color-primary-highlight: #1a3a42;
  --color-primary-subtle: #122830;
  --color-navy: #8aaad8;
  --color-navy-light: #a4bce8;
  --color-success: #4daa68;
  --color-success-bg: #122818;
  --color-warning: #d4860a;
  --color-warning-bg: #201800;
  --color-tip: #9a7adf;
  --color-tip-bg: #1e1428;
  --color-orange: #e87030;
  --color-orange-bg: #201000;
  --color-purple: #a07aef;
  --color-purple-bg: #1c1430;
  --color-gold: #d4a020;
  --color-gold-bg: #201600;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.04);
  --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(62, 184, 197, 0.2);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0f1522;
    --color-surface: #151e2e;
    --color-surface-2: #1a2538;
    --color-surface-offset: #1e2a40;
    --color-surface-offset-2: #222f48;
    --color-surface-dynamic: #2a3850;
    --color-divider: #2a3652;
    --color-border: #334060;
    --color-text: #d0daf0;
    --color-text-muted: #7a90b8;
    --color-text-faint: #4a5e80;
    --color-text-inverse: #0f1522;
    --color-primary: #3eb8c5;
    --color-primary-hover: #2ea4b0;
    --color-primary-active: #1e8c98;
    --color-primary-highlight: #1a3a42;
    --color-primary-subtle: #122830;
    --color-navy: #8aaad8;
    --color-navy-light: #a4bce8;
    --color-success: #4daa68;
    --color-success-bg: #122818;
    --color-warning: #d4860a;
    --color-warning-bg: #201800;
    --color-tip: #9a7adf;
    --color-tip-bg: #1e1428;
    --color-orange: #e87030;
    --color-orange-bg: #201000;
    --color-purple: #a07aef;
    --color-purple-bg: #1c1430;
    --color-gold: #d4a020;
    --color-gold-bg: #201600;
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.04);
    --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(62, 184, 197, 0.2);
  }
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--space-6));
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
}

img, svg { display: block; max-width: 100%; }
ul { list-style: none; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; background: none; border: none; font: inherit; color: inherit; }
h1, h2, h3, h4, h5 { text-wrap: balance; line-height: 1.15; font-family: var(--font-display); }
p, li { text-wrap: pretty; }

a, button, [role='button'] {
  transition: color var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

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

/* ——— LAYOUT ——— */
.container {
  max-width: var(--content-default);
  margin: 0 auto;
  padding-inline: clamp(var(--space-4), 4vw, var(--space-12));
}

/* ——— HEADER ——— */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: oklch(from var(--color-surface) l c h / 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  box-shadow: 0 1px 0 var(--color-divider);
  transition: box-shadow var(--transition);
}

.header--scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.logo-text {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.logo-text strong {
  color: var(--color-primary);
  font-weight: 800;
}

.logo--small .logo-text { font-size: var(--text-xs); }

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-left: auto;
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  white-space: nowrap;
}

.nav-link:hover { color: var(--color-text); background: var(--color-surface-offset); }

.nav-link--cta {
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
  padding: calc(var(--space-2) - 1px) var(--space-4);
}

.nav-link--cta:hover {
  background: var(--color-primary);
  color: white;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: var(--space-4);
}

.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  color: var(--color-text-muted);
}

.theme-toggle:hover { background: var(--color-surface-offset); color: var(--color-text); }

.menu-toggle {
  display: none;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  place-items: center;
  color: var(--color-text-muted);
}

.menu-toggle:hover { background: var(--color-surface-offset); }

/* Mobile nav */
.mobile-nav {
  display: none;
  flex-direction: column;
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  padding: var(--space-4) clamp(var(--space-4), 4vw, var(--space-12));
  gap: var(--space-1);
}

.mobile-nav.is-open {
  display: flex;
}

.mobile-nav-link {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
}

.mobile-nav-link:hover { background: var(--color-surface-offset); color: var(--color-text); }
.mobile-nav-link--cta { color: var(--color-primary); font-weight: 700; }

/* ——— BUTTONS ——— */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  letter-spacing: -0.01em;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(10, 110, 120, 0.3);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-ghost:hover {
  background: var(--color-surface-offset);
  border-color: var(--color-text-muted);
}

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

/* ——— HERO ——— */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(160deg, var(--color-navy) 0%, #0a3a55 50%, var(--color-primary-active) 100%);
  padding-block: clamp(var(--space-16), 10vw, var(--space-24));
  min-height: 520px;
  display: flex;
  align-items: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.hero-rings {
  position: absolute;
  top: 50%;
  right: -10%;
  transform: translateY(-50%);
  width: 600px;
  height: 600px;
}

.ring {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.ring-1 { width: 200px; height: 200px; }
.ring-2 { width: 320px; height: 320px; border-color: rgba(255,255,255,0.06); }
.ring-3 { width: 460px; height: 460px; border-color: rgba(255,255,255,0.04); }
.ring-4 { width: 600px; height: 600px; border-color: rgba(255,255,255,0.02); }

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 680px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.7);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: white;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-5);
}

.hero-accent {
  color: #5de8f5;
}

.hero-sub {
  font-size: var(--text-base);
  color: rgba(255, 255, 255, 0.75);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

.hero-sub em { color: rgba(255,255,255,0.9); font-style: normal; font-weight: 600; }

.hero-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-8);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.6);
  font-weight: 500;
}

.meta-divider {
  color: rgba(255, 255, 255, 0.3);
  font-size: var(--text-xs);
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero-actions .btn-ghost {
  color: rgba(255, 255, 255, 0.8);
  border-color: rgba(255, 255, 255, 0.25);
}

.hero-actions .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border-color: rgba(255, 255, 255, 0.4);
}

/* ——— INTRO BANNER ——— */
.intro-banner {
  background: var(--color-primary-subtle);
  border-bottom: 1px solid var(--color-primary-highlight);
  padding-block: var(--space-5);
}

.intro-banner p {
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-align: center;
  max-width: 70ch;
  margin: 0 auto;
  font-weight: 500;
}

[data-theme='dark'] .intro-banner {
  background: var(--color-primary-subtle);
}

/* ——— QUICK JUMP ——— */
.quick-jump {
  padding-block: var(--space-10);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-divider);
}

.jump-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.jump-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-5);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.jump-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.jump-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-lg);
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.jump-icon--phakic { background: #eff5ff; color: #2a5cb0; }
.jump-icon--astig { background: #fff4ed; color: #c05a00; }
.jump-icon--kerato { background: #f3f0ff; color: #5a30b0; }

[data-theme='dark'] .jump-icon--phakic { background: #1a2840; color: #8aaad8; }
[data-theme='dark'] .jump-icon--astig { background: #201400; color: #e87030; }
[data-theme='dark'] .jump-icon--kerato { background: #1c1430; color: #a07aef; }

.jump-label {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
  font-family: var(--font-display);
}

.jump-count {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

.jump-arrow {
  margin-left: auto;
  color: var(--color-text-faint);
  flex-shrink: 0;
  transition: transform var(--transition);
}

.jump-card:hover .jump-arrow {
  color: var(--color-primary);
  transform: translateX(3px);
}

/* ——— TOOL SECTIONS ——— */
.tool-section {
  padding-block: clamp(var(--space-12), 6vw, var(--space-20));
}

.tool-section--alt {
  background: var(--color-surface);
}

.section-header {
  margin-bottom: var(--space-10);
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.section-badge--iol { background: var(--color-primary-subtle); color: var(--color-primary); }
.section-badge--phakic { background: #eff5ff; color: #2a5cb0; }
.section-badge--astig { background: #fff4ed; color: #c05a00; }
.section-badge--kerato { background: #f3f0ff; color: #5a30b0; }
.section-badge--contact { background: var(--color-success-bg); color: var(--color-success); }

[data-theme='dark'] .section-badge--phakic { background: #1a2840; color: #8aaad8; }
[data-theme='dark'] .section-badge--astig { background: #201400; color: #e87030; }
[data-theme='dark'] .section-badge--kerato { background: #1c1430; color: #a07aef; }

.section-title {
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-3);
}

.section-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 65ch;
  line-height: 1.7;
}

/* ——— SUBSECTIONS ——— */
.subsection {
  margin-bottom: clamp(var(--space-10), 5vw, var(--space-16));
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
}

.subsection:first-of-type { border-top: none; padding-top: 0; }

.subsection-title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  letter-spacing: -0.02em;
}

.subsection-num {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-subtle);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  letter-spacing: 0;
  font-family: var(--font-body);
  flex-shrink: 0;
}

/* ——— GUIDANCE CARDS ——— */
.guidance-card {
  border-radius: var(--radius-xl);
  border: 1.5px solid var(--color-primary-highlight);
  background: var(--color-primary-subtle);
  overflow: hidden;
  margin-bottom: var(--space-6);
}

.guidance-card--warning {
  border-color: #e8c870;
  background: var(--color-warning-bg);
}

.guidance-card--warning .guidance-header {
  background: #fff0b0;
  color: #7a4400;
  border-bottom-color: #e8c870;
}

[data-theme='dark'] .guidance-card--warning {
  background: #201800;
  border-color: #6a4800;
}
[data-theme='dark'] .guidance-card--warning .guidance-header {
  background: #2a1e00;
  color: #d4860a;
  border-bottom-color: #4a3000;
}

.guidance-card--tip {
  border-color: #c8b8f0;
  background: var(--color-tip-bg);
}

.guidance-card--tip .guidance-header {
  background: #e8e0ff;
  color: #4a2890;
  border-bottom-color: #c8b8f0;
}

[data-theme='dark'] .guidance-card--tip {
  background: #1e1428;
  border-color: #4a3070;
}
[data-theme='dark'] .guidance-card--tip .guidance-header {
  background: #261a38;
  color: #9a7adf;
  border-bottom-color: #4a3070;
}

.guidance-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  border-bottom: 1px solid var(--color-primary-highlight);
  font-family: var(--font-display);
}

[data-theme='dark'] .guidance-card {
  background: var(--color-primary-subtle);
  border-color: var(--color-primary-highlight);
}
[data-theme='dark'] .guidance-header {
  background: rgba(62, 184, 197, 0.1);
  border-bottom-color: var(--color-primary-highlight);
}

.guidance-body {
  padding: var(--space-6);
}

.guidance-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
}

.guidance-col h4 {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}

.guidance-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: 55ch;
}

.guidance-list li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  padding-left: var(--space-4);
  position: relative;
}

.guidance-list li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

.guidance-list.pitfall li::before {
  content: '!';
  color: var(--color-warning);
  font-size: 0.7em;
  top: 0.15em;
  background: var(--color-warning-bg);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  left: -2px;
}

.guidance-list strong {
  color: var(--color-text);
  font-weight: 600;
}

/* ——— TOOL GRID ——— */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-5);
}

.tool-grid--single {
  grid-template-columns: minmax(280px, 480px);
}

/* ——— TOOL CARDS ——— */
.tool-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-card);
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  text-decoration: none;
}

.tool-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.tool-card--featured {
  border-color: var(--color-primary-highlight);
  background: linear-gradient(to bottom, var(--color-primary-subtle), var(--color-surface));
}

.tool-card--featured:hover {
  border-color: var(--color-primary);
}

.featured-badge {
  position: absolute;
  top: 0;
  right: 0;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: var(--color-primary);
  color: white;
  padding: 4px 10px;
  border-radius: 0 var(--radius-xl) 0 var(--radius-lg);
}

.tool-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.tool-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-lg);
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.tool-icon--phakic { background: #eff5ff; color: #2a5cb0; }
.tool-icon--astig { background: #fff4ed; color: #c05a00; }
.tool-icon--kerato { background: #f3f0ff; color: #5a30b0; }

[data-theme='dark'] .tool-icon--phakic { background: #1a2840; color: #8aaad8; }
[data-theme='dark'] .tool-icon--astig { background: #201400; color: #e87030; }
[data-theme='dark'] .tool-icon--kerato { background: #1c1430; color: #a07aef; }

.tool-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  justify-content: flex-end;
}

/* Tags */
.tag {
  font-size: 0.67rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.tag--green { background: var(--color-success-bg); color: var(--color-success); }
.tag--blue { background: #e8f0ff; color: #1a50c0; }
.tag--teal { background: var(--color-primary-subtle); color: var(--color-primary); }
.tag--orange { background: var(--color-orange-bg); color: var(--color-orange); }
.tag--purple { background: var(--color-purple-bg); color: var(--color-purple); }
.tag--gold { background: var(--color-gold-bg); color: var(--color-gold); }

[data-theme='dark'] .tag--blue { background: #1a2840; color: #8aaad8; }

.tool-name {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.tool-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  flex: 1;
  margin-bottom: var(--space-4);
}

/* ——— HOW-TO STEPS ——— */
.tool-how {
  background: var(--color-surface-offset);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-bottom: var(--space-4);
}

.tool-how-title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.tool-how-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  list-style: decimal;
  padding-left: var(--space-5);
  counter-reset: step;
}

.tool-how-steps li {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.55;
  padding-left: var(--space-1);
}

/* ——— CARD FOOTER ——— */
.tool-footer {
  margin-top: auto;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
}

.tool-link-label {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-primary);
  font-family: var(--font-display);
  letter-spacing: -0.01em;
  transition: letter-spacing var(--transition);
}

.tool-card:hover .tool-link-label {
  letter-spacing: 0;
}

/* ——— PROSE BLOCK ——— */
.prose-block {
  background: var(--color-surface);
  border-left: 3px solid var(--color-primary);
  padding: var(--space-5) var(--space-6);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  margin-bottom: var(--space-8);
}

.prose-block p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.75;
  max-width: 75ch;
}

/* ——— IOL DRILL-DOWN MENU ——— */
.iol-menu {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.iol-menu-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  width: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  cursor: pointer;
  text-align: left;
  transition: background var(--transition-interactive),
              border-color var(--transition-interactive),
              transform var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.iol-menu-card:hover {
  background: var(--color-surface-2);
  border-color: var(--color-primary);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.iol-menu-num {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-primary);
  font-family: var(--font-display, var(--font-body));
  min-width: 2.5rem;
  flex-shrink: 0;
}

.iol-menu-title {
  flex: 1;
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text);
}

.iol-menu-arrow {
  color: var(--color-text-muted);
  flex-shrink: 0;
  transition: color var(--transition-interactive), transform var(--transition-interactive);
}

.iol-menu-card:hover .iol-menu-arrow {
  color: var(--color-primary);
  transform: translateX(3px);
}

/* Detail view */
.iol-detail[hidden] {
  display: none;
}

.iol-detail {
  display: block;
  animation: fadeSlideIn 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateX(16px); }
  to   { opacity: 1; transform: translateX(0); }
}

.iol-back-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition-interactive),
              border-color var(--transition-interactive),
              color var(--transition-interactive);
}

.iol-back-btn:hover {
  background: var(--color-surface-2);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.iol-back-btn svg {
  transition: transform var(--transition-interactive);
}

.iol-back-btn:hover svg {
  transform: translateX(-3px);
}

/* Hide all subsections by default inside detail; JS reveals the active one */
.iol-detail .subsection {
  display: none;
}

.iol-detail .subsection.is-active {
  display: block;
}

/* ——— POST-RK TOPOGRAPHY FIGURE ——— */
.rk-topo-figure {
  margin: var(--space-8) 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.rk-topo-figure img {
  width: 100%;
  height: auto;
  display: block;
  max-height: 480px;
  object-fit: contain;
  background: #fff;
  padding: var(--space-4);
}

.rk-topo-figure figcaption {
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  line-height: 1.5;
}

/* ——— CONTACT SECTION ——— */
.contact-section {
  background: linear-gradient(160deg, var(--color-navy) 0%, #0a3a55 100%);
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
}

.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: start;
}

.contact-text .section-badge--contact {
  background: rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.9);
}

.contact-title {
  font-size: var(--text-xl);
  font-weight: 800;
  color: white;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
  line-height: 1.15;
}

.contact-desc {
  font-size: var(--text-base);
  color: rgba(255,255,255,0.7);
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.contact-list li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.75);
  font-weight: 500;
}

.contact-list li svg {
  color: #5de8f5;
  flex-shrink: 0;
}

.contact-form-wrap {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-lg);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-group label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}

.form-group input,
.form-group select,
.form-group textarea {
  background: var(--color-surface-offset);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text);
  width: 100%;
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-faint);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-highlight);
}

.form-group select {
  -webkit-appearance: none;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 7L11 1' stroke='%235a6a8a' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-4) center;
  padding-right: var(--space-10);
}

.form-group textarea {
  resize: vertical;
  min-height: 110px;
}

.form-note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-align: center;
  line-height: 1.5;
}

/* ——— FOOTER ——— */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  padding-top: clamp(var(--space-12), 5vw, var(--space-16));
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: var(--space-12);
  padding-bottom: var(--space-12);
}

.footer-brand .logo {
  margin-bottom: var(--space-4);
}

.footer-tagline {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 36ch;
}

.footer-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-col-title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text);
  margin-bottom: var(--space-1);
  font-family: var(--font-display);
}

.footer-col a {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  padding: var(--space-1) 0;
}

.footer-col a:hover { color: var(--color-primary); }

.footer-bottom {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-5);
}

.footer-bottom span {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* ——— RESPONSIVE ——— */
@media (max-width: 900px) {
  .nav { display: none; }
  .menu-toggle { display: grid; }
  .header { height: auto; min-height: var(--header-height); }
  .header-inner { height: var(--header-height); }

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

  .guidance-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .contact-inner {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

@media (max-width: 640px) {
  .hero-title { font-size: clamp(1.75rem, 8vw, 2.5rem); }
  .hero-meta { gap: var(--space-2); }
  .meta-divider { display: none; }

  .jump-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3);
  }

  .jump-card {
    padding: var(--space-4);
    gap: var(--space-3);
  }

  .tool-grid { grid-template-columns: 1fr; }
  .tool-grid--single { grid-template-columns: 1fr; }

  .form-row { grid-template-columns: 1fr; }

  .footer-links { grid-template-columns: 1fr; }

  .hero-actions { flex-direction: column; align-items: flex-start; }
  .hero-actions .btn { width: 100%; justify-content: center; }

  .subsection-title { flex-wrap: wrap; }
}

/* ——— SCROLL REVEAL ——— */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}

/* ——— AUTHOR AVATAR ——— */
.meta-item--author {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.author-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  border: 2px solid rgba(255, 255, 255, 0.35);
  flex-shrink: 0;
}

/* ——— FILE UPLOAD ——— */
.form-label-optional {
  font-weight: 400;
  color: var(--color-text-faint);
  text-transform: none;
  letter-spacing: 0;
  font-size: var(--text-xs);
}

.file-upload {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  background: var(--color-surface-offset);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-5);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}

.file-upload:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-subtle);
}

.file-upload svg {
  color: var(--color-text-faint);
  flex-shrink: 0;
}

.file-upload:hover svg {
  color: var(--color-primary);
}

.file-upload-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.file-upload-main {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

.file-upload-sub {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.file-input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

.file-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.file-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface-offset);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.file-item svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

.file-item-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--color-text);
  font-weight: 500;
}

.file-item-size {
  color: var(--color-text-faint);
  flex-shrink: 0;
}

.file-item-remove {
  width: 20px;
  height: 20px;
  border-radius: var(--radius-full);
  display: grid;
  place-items: center;
  color: var(--color-text-faint);
  cursor: pointer;
  flex-shrink: 0;
}

.file-item-remove:hover {
  background: var(--color-surface-dynamic);
  color: var(--color-error, #a12c7b);
}