/* ============================================
   Joe's Space — Design System & Styles
   ============================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Sans+TC:wght@300;400;500;700&display=swap');

/* ---------- Design Tokens ---------- */
:root {
  /* Primary palette — Mint / Sage */
  --mint-50:  #f0fdf9;
  --mint-100: #ccfbef;
  --mint-200: #99f6df;
  --mint-300: #5dead0;
  --mint-400: #38d1b8;
  --mint-500: #14b8a6;
  --mint-600: #0d9488;
  --mint-700: #0f766e;

  /* Warm neutrals */
  --sand-50:  #fafaf8;
  --sand-100: #f5f5f0;
  --sand-200: #e8e8e0;
  --sand-300: #d4d4c8;
  --sand-600: #6b6b5e;
  --sand-800: #363630;
  --sand-900: #1c1c18;

  /* Accent — soft coral for contrast moments */
  --coral:    #f0846a;

  /* Functional */
  --color-bg:           var(--sand-50);
  --color-surface:      #ffffff;
  --color-text:         var(--sand-900);
  --color-text-secondary: var(--sand-600);
  --color-primary:      var(--mint-500);
  --color-primary-hover: var(--mint-600);
  --color-primary-light: var(--mint-100);
  --color-border:       var(--sand-200);

  /* Typography */
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body:    'Noto Sans TC', 'Inter', sans-serif;

  /* Type scale */
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;
  --text-6xl:  3.75rem;

  /* 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;

  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg:  0 12px 32px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.04);
  --shadow-glow: 0 0 40px rgba(20, 184, 166, 0.15);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 200ms;
  --duration-normal: 350ms;
  --duration-slow: 600ms;

  /* Layout */
  --container-max: 1120px;
  --nav-height: 72px;
}

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

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-24) 0;
}

.section-label {
  display: inline-block;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section-title {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-4);
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: 1.8;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-header .section-subtitle {
  margin: 0 auto;
}

/* ---------- Navigation ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: background var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

.navbar.scrolled {
  background: rgba(250, 250, 248, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--color-border);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav-logo span {
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

.nav-links a {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-full);
  transition: color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out);
}

.nav-links a:hover {
  color: var(--color-text);
  background: var(--sand-100);
}

.nav-links a.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--duration-normal) var(--ease-out),
              opacity var(--duration-fast);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--nav-height) var(--space-6) var(--space-16);
  overflow: hidden;
  background: linear-gradient(170deg, var(--mint-50) 0%, var(--sand-50) 40%, var(--color-bg) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
}

.hero-title {
  font-size: var(--text-6xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--space-6);
  background: linear-gradient(135deg, var(--mint-600) 0%, var(--mint-400) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-10);
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: #ffffff;
  background: linear-gradient(135deg, var(--mint-500), var(--mint-600));
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
  text-decoration: none;
}

.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
  color: #ffffff;
}

.hero-cta svg {
  width: 18px;
  height: 18px;
  transition: transform var(--duration-normal) var(--ease-out);
}

.hero-cta:hover svg {
  transform: translateX(3px);
}

/* Wave decoration */
.hero-wave {
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  z-index: 1;
}

.hero-wave svg {
  display: block;
  width: 100%;
  height: auto;
}

/* Floating shapes */
.hero-shapes {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.hero-shape {
  position: absolute;
  border-radius: 50%;
  opacity: 0.12;
  animation: float 20s ease-in-out infinite;
}

.hero-shape:nth-child(1) {
  width: 400px;
  height: 400px;
  background: var(--mint-300);
  top: -100px;
  right: -100px;
  animation-delay: 0s;
}

.hero-shape:nth-child(2) {
  width: 300px;
  height: 300px;
  background: var(--mint-200);
  bottom: 100px;
  left: -80px;
  animation-delay: -7s;
}

.hero-shape:nth-child(3) {
  width: 200px;
  height: 200px;
  background: var(--mint-400);
  top: 30%;
  right: 15%;
  animation-delay: -14s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25%      { transform: translate(20px, -30px) scale(1.05); }
  50%      { transform: translate(-10px, 20px) scale(0.95); }
  75%      { transform: translate(15px, 10px) scale(1.02); }
}

/* ---------- Cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--mint-200);
}

.card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-5);
  color: var(--mint-600);
}

.card-icon svg {
  width: 24px;
  height: 24px;
}

.card-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.card-text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ---------- Feature cards (preview on homepage) ---------- */
.preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.preview-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  text-align: center;
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

.preview-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.preview-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-5);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--mint-100), var(--mint-200));
  border-radius: var(--radius-lg);
  color: var(--mint-600);
}

.preview-icon svg {
  width: 28px;
  height: 28px;
}

.preview-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.preview-text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ---------- About page ---------- */
.about-story {
  max-width: 720px;
  margin: 0 auto var(--space-16);
}

.about-story-text {
  font-size: var(--text-lg);
  line-height: 2;
  color: var(--color-text-secondary);
}

.about-story-text strong {
  color: var(--color-text);
  font-weight: 500;
}

.about-highlight {
  display: inline;
  background: linear-gradient(to top, var(--mint-100) 40%, transparent 40%);
  padding: 0 2px;
}

.credential-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.credential-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.credential-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  color: var(--mint-600);
}

.credential-icon svg {
  width: 22px;
  height: 22px;
}

.credential-title {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.credential-text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* ---------- Portfolio ---------- */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.portfolio-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
  display: flex;
  flex-direction: column;
}

.portfolio-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.portfolio-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.portfolio-card-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-sm);
  color: var(--mint-600);
}

.portfolio-card-icon svg {
  width: 20px;
  height: 20px;
}

.portfolio-card-title {
  font-size: var(--text-lg);
  font-weight: 600;
}

.portfolio-card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-5);
  flex-grow: 1;
}

.portfolio-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.portfolio-tag {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--mint-700);
  background: var(--mint-50);
  border: 1px solid var(--mint-200);
  border-radius: var(--radius-full);
}

.portfolio-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-5);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
}

.portfolio-link svg {
  width: 16px;
  height: 16px;
  transition: transform var(--duration-fast) var(--ease-out);
}

.portfolio-link:hover svg {
  transform: translateX(3px);
}

.portfolio-github-cta {
  text-align: center;
  margin-top: var(--space-12);
}

/* ---------- Teaching ---------- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-bottom: var(--space-16);
}

.stat-card {
  text-align: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8) var(--space-6);
}

.stat-number {
  font-family: var(--font-display);
  font-size: var(--text-5xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--mint-500), var(--mint-700));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-2);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
}

.org-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
}

.org-tag {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: border-color var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
}

.org-tag:hover {
  border-color: var(--mint-300);
  color: var(--color-text);
}

.teaching-topics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-16);
}

.topic-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.topic-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  color: var(--mint-600);
}

.topic-icon svg {
  width: 20px;
  height: 20px;
}

.topic-title {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.topic-text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* ---------- Contact ---------- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.contact-item-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  color: var(--mint-600);
}

.contact-item-icon svg {
  width: 22px;
  height: 22px;
}

.contact-item-label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-1);
}

.contact-item-value {
  font-weight: 500;
}

.contact-item-value a {
  color: var(--color-text);
}

.contact-item-value a:hover {
  color: var(--color-primary);
}

/* Form */
.contact-form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--sand-50);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--mint-400);
  box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.1);
}

.form-textarea {
  min-height: 140px;
  resize: vertical;
}

.form-submit {
  width: 100%;
  padding: var(--space-4);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: #ffffff;
  background: linear-gradient(135deg, var(--mint-500), var(--mint-600));
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

.form-submit:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.form-submit:active {
  transform: translateY(0);
}

/* ---------- Page Header (inner pages) ---------- */
.page-header {
  padding: calc(var(--nav-height) + var(--space-16)) 0 var(--space-16);
  background: linear-gradient(170deg, var(--mint-50) 0%, var(--color-bg) 100%);
  text-align: center;
}

.page-header .section-title {
  font-size: var(--text-5xl);
}

/* ---------- Footer ---------- */
.footer {
  background: var(--sand-900);
  color: var(--sand-300);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-brand p {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--sand-600);
  max-width: 320px;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: #ffffff;
}

.footer-logo span {
  color: var(--mint-400);
}

.footer h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--sand-300);
  margin-bottom: var(--space-5);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--sand-600);
  transition: color var(--duration-fast) var(--ease-out);
}

.footer-links a:hover {
  color: var(--mint-400);
}

.footer-social {
  display: flex;
  gap: var(--space-3);
  list-style: none;
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.06);
  color: var(--sand-300);
  transition: background var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
}

.footer-social a:hover {
  background: var(--mint-600);
  color: #ffffff;
}

.footer-social svg {
  width: 18px;
  height: 18px;
}

.footer-bottom {
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--sand-600);
}

/* ---------- Ask Me Anything — Floating Widget ---------- */

/* FAB trigger button */
.askme-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  width: 60px;
  height: 60px;
  border-radius: var(--radius-full);
  border: none;
  background: linear-gradient(135deg, var(--mint-500), var(--mint-600));
  color: #fff;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(20, 184, 166, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.askme-fab:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 28px rgba(20, 184, 166, 0.45);
}

.askme-fab:active {
  transform: scale(0.95);
}

.askme-fab svg {
  width: 28px;
  height: 28px;
  transition: transform var(--duration-normal) var(--ease-out);
}

.askme-fab.open svg {
  transform: rotate(90deg);
}

/* Pulse ring on FAB */
.askme-fab::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: var(--radius-full);
  border: 2px solid var(--mint-400);
  opacity: 0;
  animation: askme-pulse 3s ease-in-out infinite;
}

.askme-fab.open::before {
  animation: none;
  opacity: 0;
}

@keyframes askme-pulse {
  0%, 100% { transform: scale(1); opacity: 0; }
  50% { transform: scale(1.2); opacity: 0.4; }
}

/* Chat panel */
.askme-panel {
  position: fixed;
  bottom: 96px;
  right: 24px;
  z-index: 9998;
  width: 380px;
  max-height: 520px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: 0 12px 48px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.06);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(0.8) translateY(20px);
  opacity: 0;
  pointer-events: none;
  transform-origin: bottom right;
  transition: transform var(--duration-normal) var(--ease-out),
              opacity var(--duration-normal) var(--ease-out);
}

.askme-panel.open {
  transform: scale(1) translateY(0);
  opacity: 1;
  pointer-events: auto;
}

/* Panel header */
.askme-header {
  padding: var(--space-4) var(--space-5);
  background: linear-gradient(135deg, var(--mint-500), var(--mint-600));
  color: #fff;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.askme-header-avatar {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.2);
  border-radius: var(--radius-full);
  font-size: 1.1rem;
}

.askme-header-info h3 {
  color: #fff;
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: 1px;
}

.askme-header-info p {
  font-size: var(--text-xs);
  opacity: 0.85;
}

/* Chat area */
.askme-chat {
  flex: 1;
  padding: var(--space-4);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  scroll-behavior: smooth;
  min-height: 260px;
  max-height: 340px;
  background: var(--sand-50);
}

.askme-bubble {
  display: flex;
  gap: var(--space-2);
  max-width: 85%;
  animation: askme-fade-in 0.3s var(--ease-out) both;
}

@keyframes askme-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.askme-bubble-ai  { align-self: flex-start; }
.askme-bubble-user { align-self: flex-end; flex-direction: row-reverse; }

.askme-avatar {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
}

.askme-bubble-user .askme-avatar { background: var(--mint-200); }

.askme-text {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
}

.askme-bubble-ai .askme-text {
  background: #fff;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-bottom-left-radius: 4px;
}

.askme-bubble-user .askme-text {
  background: linear-gradient(135deg, var(--mint-500), var(--mint-600));
  color: #fff;
  border-bottom-right-radius: 4px;
}

/* Typing dots */
.askme-typing {
  display: inline-flex;
  gap: 4px;
  padding: var(--space-2) var(--space-3);
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  border-bottom-left-radius: 4px;
}

.askme-typing-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--sand-300);
  animation: askme-dot-bounce 1.2s ease-in-out infinite;
}

.askme-typing-dot:nth-child(2) { animation-delay: 0.15s; }
.askme-typing-dot:nth-child(3) { animation-delay: 0.3s; }

@keyframes askme-dot-bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-5px); opacity: 1; }
}

/* Input form */
.askme-form {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.askme-input {
  flex: 1;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text);
  background: var(--sand-50);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  outline: none;
  transition: border-color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.askme-input:focus {
  border-color: var(--mint-400);
  box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.1);
}

.askme-input::placeholder {
  color: var(--sand-300);
}

.askme-send {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--mint-500), var(--mint-600));
  color: #fff;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.askme-send:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-glow);
}

.askme-send:active { transform: scale(0.95); }

.askme-send:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.askme-send svg {
  width: 18px;
  height: 18px;
}

/* Mobile responsive */
@media (max-width: 480px) {
  .askme-panel {
    width: calc(100vw - 24px);
    right: 12px;
    bottom: 88px;
    max-height: 70vh;
  }

  .askme-fab {
    right: 16px;
    bottom: 16px;
    width: 54px;
    height: 54px;
  }
}

/* ---------- Scroll Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered reveals */
.reveal-delay-1 { transition-delay: 100ms; }
.reveal-delay-2 { transition-delay: 200ms; }
.reveal-delay-3 { transition-delay: 300ms; }
.reveal-delay-4 { transition-delay: 400ms; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  color: #ffffff;
  background: linear-gradient(135deg, var(--mint-500), var(--mint-600));
}

.btn-primary:hover {
  box-shadow: var(--shadow-glow);
  color: #ffffff;
}

.btn-outline {
  color: var(--color-text);
  background: transparent;
  border: 1.5px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--mint-300);
  color: var(--color-primary);
}

.btn svg {
  width: 16px;
  height: 16px;
}

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

  .reveal {
    opacity: 1;
    transform: none;
  }

  html {
    scroll-behavior: auto;
  }
}

/* ---------- Responsive ---------- */

/* Tablet */
@media (max-width: 1024px) {
  .hero-title {
    font-size: var(--text-5xl);
  }

  .card-grid,
  .preview-grid,
  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .contact-layout {
    grid-template-columns: 1fr;
  }
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(250, 250, 248, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: var(--space-4) var(--space-6);
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--duration-normal) var(--ease-out),
                opacity var(--duration-normal) var(--ease-out);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding: calc(var(--nav-height) + var(--space-16)) var(--space-6) var(--space-20);
  }

  .hero-title {
    font-size: var(--text-4xl);
  }

  .hero-subtitle {
    font-size: var(--text-lg);
  }

  .section {
    padding: var(--space-16) 0;
  }

  .section-title {
    font-size: var(--text-3xl);
  }

  .page-header .section-title {
    font-size: var(--text-4xl);
  }

  .card-grid,
  .preview-grid,
  .portfolio-grid,
  .credential-grid,
  .stats-row,
  .teaching-topics {
    grid-template-columns: 1fr;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .hero-title {
    font-size: var(--text-3xl);
  }

  .stat-number {
    font-size: var(--text-4xl);
  }
}