/* ========================================
   Design Tokens
   "Living Botanical Manuscript"
   A quiet cafe with greenery, a reading corner
   ======================================== */

:root {
  /* Typography */
  --font-heading: "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;

  /* Light mode — warm cream & botanical greens */
  --color-bg: #f5f0e8;
  --color-surface: #faf7f2;
  --color-text: #3d3529;
  --color-text-muted: #7a6f5f;
  --color-accent: #4a7c59;
  --color-accent-hover: #3a6347;
  --color-accent-light: #e8f0e6;
  --color-border: #ddd5c6;
  --color-highlight: #f0ebe0;

  /* Extra botanical tones */
  --color-leaf: #5a8a66;
  --color-petal: #c4a882;
  --color-bark: #8b7355;
  --color-moss: #6b9470;
  --color-paper: #efe9dd;

  /* Layout */
  --max-width: 680px;
  --radius: 8px;
  --radius-lg: 16px;
}

/* Dark tokens — system preference */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #1e1c18;
    --color-surface: #2a2720;
    --color-text: #e4ddd0;
    --color-text-muted: #a89d8a;
    --color-accent: #7fb88c;
    --color-accent-hover: #9dcca7;
    --color-accent-light: #2a3329;
    --color-border: #3d3729;
    --color-highlight: #2f2c24;
    --color-leaf: #7fb88c;
    --color-petal: #b5a48e;
    --color-bark: #9e8d77;
    --color-moss: #6b9470;
    --color-paper: #252219;
  }
}

/* Dark tokens — manual override */
:root[data-theme="dark"] {
  --color-bg: #1e1c18;
  --color-surface: #2a2720;
  --color-text: #e4ddd0;
  --color-text-muted: #a89d8a;
  --color-accent: #7fb88c;
  --color-accent-hover: #9dcca7;
  --color-accent-light: #2a3329;
  --color-border: #3d3729;
  --color-highlight: #2f2c24;
  --color-leaf: #7fb88c;
  --color-petal: #b5a48e;
  --color-bark: #9e8d77;
  --color-moss: #6b9470;
  --color-paper: #252219;
}

/* ========================================
   Reset & Base
   ======================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ========================================
   Theme toggle — subtle, top-right
   ======================================== */

.theme-toggle {
  position: fixed;
  top: var(--space-md);
  right: var(--space-md);
  z-index: 50;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  opacity: 0.45;
  transition: opacity 0.3s ease, color 0.3s ease, transform 0.3s cubic-bezier(0.23, 1, 0.32, 1);
}

.theme-toggle:hover {
  opacity: 0.9;
  transform: rotate(15deg);
}

.theme-toggle svg {
  width: 1.1rem;
  height: 1.1rem;
}

/* Show sun in dark mode, moon in light mode */
.theme-icon--sun { display: none; }
.theme-icon--moon { display: block; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-icon--sun { display: block; }
  :root:not([data-theme="light"]) .theme-icon--moon { display: none; }
}
:root[data-theme="dark"] .theme-icon--sun { display: block; }
:root[data-theme="dark"] .theme-icon--moon { display: none; }
:root[data-theme="light"] .theme-icon--sun { display: none; }
:root[data-theme="light"] .theme-icon--moon { display: block; }

/* Paper-grain texture overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.025;
  z-index: 100;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-size: 256px 256px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) body::before { opacity: 0.04; }
}
:root[data-theme="dark"] body::before { opacity: 0.04; }

/* ========================================
   Layout
   ======================================== */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
  position: relative;
}

@media (max-width: 480px) {
  .container {
    padding: var(--space-xl) var(--space-md);
  }
}

/* ========================================
   Reveal animations — elements fade/rise in
   ======================================== */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s cubic-bezier(0.23, 1, 0.32, 1),
              transform 0.7s cubic-bezier(0.23, 1, 0.32, 1);
}

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

/* Stagger children */
.reveal-stagger > .reveal:nth-child(1) { transition-delay: 0s; }
.reveal-stagger > .reveal:nth-child(2) { transition-delay: 0.08s; }
.reveal-stagger > .reveal:nth-child(3) { transition-delay: 0.16s; }
.reveal-stagger > .reveal:nth-child(4) { transition-delay: 0.24s; }
.reveal-stagger > .reveal:nth-child(5) { transition-delay: 0.32s; }

/* ========================================
   Organic dividers (leaf vine SVG)
   ======================================== */

.divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin: var(--space-xl) 0;
  color: var(--color-border);
}

.divider::before,
.divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--color-border) 30%,
    var(--color-border) 70%,
    transparent
  );
}

.divider-leaf {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  opacity: 0.4;
}

/* ========================================
   Portrait
   ======================================== */

.portrait-frame {
  width: 160px;
  height: 160px;
  margin: 0 auto var(--space-lg);
  border-radius: 50%;
  padding: 4px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-moss), var(--color-petal));
  box-shadow:
    0 4px 20px -4px rgba(74, 124, 89, 0.2),
    0 0 0 6px var(--color-bg);
  position: relative;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .portrait-frame {
    box-shadow: 0 4px 20px -4px rgba(0, 0, 0, 0.4), 0 0 0 6px var(--color-bg);
  }
}
:root[data-theme="dark"] .portrait-frame {
  box-shadow: 0 4px 20px -4px rgba(0, 0, 0, 0.4), 0 0 0 6px var(--color-bg);
}

.portrait {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 20%;
}

@media (min-width: 640px) {
  .portrait-frame {
    width: 180px;
    height: 180px;
  }
}

/* ========================================
   Identity Header
   ======================================== */

.identity {
  text-align: center;
  margin-bottom: var(--space-lg);
  padding: var(--space-xl) 0 var(--space-lg);
  position: relative;
}

/* Soft botanical halo behind the name */
.identity::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -55%);
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    var(--color-accent-light) 0%,
    transparent 70%
  );
  opacity: 0.5;
  pointer-events: none;
  z-index: -1;
}

.greeting {
  font-family: var(--font-body);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.name {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-md);
  color: var(--color-text);
  line-height: 1.1;
}

.tagline {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 440px;
  margin: 0 auto;
  line-height: 1.65;
}

@media (min-width: 640px) {
  .name {
    font-size: 3.5rem;
  }
}

/* ========================================
   Section Labels (shared)
   ======================================== */

.section-label {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
  position: relative;
  display: inline-block;
}

/* Underline accent — a short botanical stroke */
.section-label::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 40px;
  height: 2px;
  border-radius: 2px;
  background-color: var(--color-accent);
  opacity: 0.6;
}

/* ========================================
   Prose
   ======================================== */

.prose p {
  margin-bottom: var(--space-md);
  color: var(--color-text);
  font-size: 0.95rem;
  line-height: 1.8;
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose .invite {
  font-family: var(--font-heading);
  font-style: italic;
  color: var(--color-accent);
  margin-top: var(--space-lg);
  padding-left: var(--space-md);
  border-left: 2px solid var(--color-accent);
  opacity: 0.85;
}

/* Stylistic first letter for lead paragraph */
.prose .lead-paragraph::first-letter {
  font-family: var(--font-heading);
  font-size: 3.2em;
  float: left;
  line-height: 0.8;
  margin-right: 0.08em;
  margin-top: 0.05em;
  color: var(--color-accent);
}

/* ========================================
   About / Đôi điều
   ======================================== */

.about {
  margin-bottom: var(--space-xl);
}

/* ========================================
   Now / Đang làm gì
   ======================================== */

.now {
  margin-bottom: var(--space-xl);
}

.now-grid {
  display: grid;
  gap: var(--space-md);
}

@media (min-width: 480px) {
  .now-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.now-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  position: relative;
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.23, 1, 0.32, 1),
              box-shadow 0.3s ease;
}

/* Decorative corner accent */
.now-card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 40px;
  height: 40px;
  border-top: 2px solid var(--color-accent);
  border-left: 2px solid var(--color-accent);
  border-top-left-radius: var(--radius-lg);
  opacity: 0.35;
  transition: opacity 0.3s ease, width 0.3s ease, height 0.3s ease;
}

.now-card:hover::before {
  opacity: 0.6;
  width: 56px;
  height: 56px;
}

.now-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px -8px rgba(74, 124, 89, 0.1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .now-card:hover {
    box-shadow: 0 8px 24px -8px rgba(0, 0, 0, 0.3);
  }
}
:root[data-theme="dark"] .now-card:hover {
  box-shadow: 0 8px 24px -8px rgba(0, 0, 0, 0.3);
}

.now-card h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 400;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.now-card p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ========================================
   Coaching / Góc Trò Chuyện
   ======================================== */

.coaching {
  margin-bottom: var(--space-xl);
}

.coaching .prose {
  margin-bottom: var(--space-lg);
}

.topic-list {
  display: grid;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.topic {
  background-color: var(--color-accent-light);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  position: relative;
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.23, 1, 0.32, 1);
}

/* Side accent bar */
.topic::before {
  content: "";
  position: absolute;
  top: var(--space-md);
  bottom: var(--space-md);
  left: 0;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: linear-gradient(180deg, var(--color-accent), var(--color-moss));
  opacity: 0.5;
  transition: opacity 0.3s ease;
}

.topic:hover::before {
  opacity: 0.8;
}

.topic:hover {
  transform: translateX(4px);
}

.topic h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 400;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.topic p {
  font-size: 0.88rem;
  color: var(--color-text);
  line-height: 1.7;
}

.coaching-cta {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.75;
  padding: var(--space-md) var(--space-lg);
  background: linear-gradient(135deg, var(--color-accent-light), transparent 80%);
  border-radius: var(--radius-lg);
}

/* ========================================
   Footer
   ======================================== */

.site-footer {
  padding-top: var(--space-xl);
  text-align: center;
  position: relative;
}

/* Botanical footer ornament */
.site-footer::before {
  content: "";
  display: block;
  width: 60px;
  height: 1px;
  background: var(--color-border);
  margin: 0 auto var(--space-lg);
}

/* Compact icon row */
.footer-icons {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.footer-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  text-decoration: none;
  transition: color 0.2s ease,
              border-color 0.2s ease,
              background-color 0.2s ease,
              transform 0.2s cubic-bezier(0.23, 1, 0.32, 1);
}

.footer-icon svg {
  width: 1.1rem;
  height: 1.1rem;
}

.footer-icon:hover,
.footer-icon:focus-visible {
  color: var(--color-surface);
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  transform: translateY(-2px);
  outline: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .footer-icon:hover,
  :root:not([data-theme="light"]) .footer-icon:focus-visible {
    color: var(--color-bg);
  }
}
:root[data-theme="dark"] .footer-icon:hover,
:root[data-theme="dark"] .footer-icon:focus-visible {
  color: var(--color-bg);
}

.site-footer p {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  opacity: 0.7;
}

/* ========================================
   Selection style
   ======================================== */

::selection {
  background-color: var(--color-accent-light);
  color: var(--color-accent);
}


/* ========================================
   Focus styles for accessibility
   ======================================== */

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

/* ========================================
   Scrollbar (subtle, botanical)
   ======================================== */

@supports (scrollbar-width: thin) {
  html {
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
  }
}

/* ========================================
   Language toggle — subtle pill, top-left
   ======================================== */

.lang-toggle {
  position: fixed;
  top: var(--space-md);
  left: var(--space-md);
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 0.2em;
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: transparent;
  color: var(--color-text-muted);
  font-family: var(--font-body);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  cursor: pointer;
  opacity: 0.5;
  transition: opacity 0.3s ease, border-color 0.3s ease;
}

.lang-toggle:hover {
  opacity: 0.9;
  border-color: var(--color-accent);
}

.lang-sep {
  opacity: 0.4;
}

.lang-opt {
  padding: 0.1em 0.15em;
  border-radius: 3px;
  transition: color 0.2s ease, font-weight 0.2s ease;
}

.lang-opt.active {
  color: var(--color-accent);
  font-weight: 600;
}