/* ========================================
   Design System — joshsi.com
   Pure CSS, no build step required
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* ---------- Design Tokens ---------- */
:root {
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;

  /* Light palette */
  --color-bg: #f4f4f5;
  /* zinc-100 */
  --color-bg-card: #ffffff;
  --color-fg: #27272a;
  /* zinc-800 */
  --color-fg-muted: #52525b;
  /* zinc-600 */
  --color-fg-subtle: #a1a1aa;
  /* zinc-400 */
  --color-border: #e4e4e7;
  /* zinc-200 */
  --color-accent: #2563eb;
  /* blue-600 */
  --color-accent-hover: #1d4ed8;
  /* blue-700 */
  --color-accent-muted: #93c5fd;
  /* blue-300 */

  /* Surfaces */
  --color-surface-hover: #f4f4f5;
  --color-btn-primary-bg: #27272a;
  --color-btn-primary-fg: #f4f4f5;
  --color-btn-primary-hover: #3f3f46;
  --color-btn-secondary-bg: #fafafa;
  --color-btn-secondary-fg: #27272a;
  --color-btn-secondary-hover: #f4f4f5;

  /* Feedback */
  --color-correct: #16a34a;
  --color-correct-bg: transparent;
  --color-incorrect: #ef4444;
  --color-incorrect-bg: #fef2f2;

  /* Spacing & sizing */
  --container-max: 80rem;
  --container-inner-max: 64rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Dark Mode ---------- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #09090b;
    /* zinc-950 */
    --color-bg-card: #18181b;
    /* zinc-900 */
    --color-fg: #f4f4f5;
    /* zinc-100 */
    --color-fg-muted: #a1a1aa;
    /* zinc-400 */
    --color-fg-subtle: #71717a;
    /* zinc-500 */
    --color-border: #27272a;
    /* zinc-800 */
    --color-accent: #60a5fa;
    /* blue-400 */
    --color-accent-hover: #93c5fd;
    /* blue-300 */
    --color-accent-muted: #1e40af;
    /* blue-800 */

    --color-surface-hover: #27272a;
    --color-btn-primary-bg: #3f3f46;
    --color-btn-primary-fg: #f4f4f5;
    --color-btn-primary-hover: #52525b;
    --color-btn-secondary-bg: rgba(39, 39, 42, 0.5);
    --color-btn-secondary-fg: #d4d4d8;
    --color-btn-secondary-hover: #27272a;

    --color-correct: #4ade80;
    --color-correct-bg: transparent;
    --color-incorrect: #ef4444;
    --color-incorrect-bg: rgba(127, 29, 29, 0.5);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
  }
}

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

html {
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  background-color: var(--color-bg);
  color: var(--color-fg);
  min-height: 100dvh;
}

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

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

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

a:focus-visible {
  outline: 2px dotted var(--color-accent);
  outline-offset: 2px;
}

/* ---------- Layout: Container ---------- */
.container-outer {
  padding-left: 1rem;
  padding-right: 1rem;
}

@media (min-width: 640px) {
  .container-outer {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

.container-inner-wrap {
  margin-left: auto;
  margin-right: auto;
  max-width: var(--container-max);
}

@media (min-width: 1024px) {
  .container-inner-wrap {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

.container-inner {
  position: relative;
  padding-left: 1rem;
  padding-right: 1rem;
}

@media (min-width: 640px) {
  .container-inner {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

@media (min-width: 1024px) {
  .container-inner {
    padding-left: 3rem;
    padding-right: 3rem;
  }
}

.container-content {
  margin-left: auto;
  margin-right: auto;
  max-width: var(--container-inner-max);
}

/* ---------- Typography ---------- */
.heading-xl {
  font-size: clamp(1.5rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--color-fg);
}

.text-body {
  font-size: clamp(0.875rem, 2vw, 1rem);
  line-height: 1.75;
  color: var(--color-fg-muted);
}

.text-sm {
  font-size: 0.875rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  text-decoration: none;
  outline-offset: 2px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--color-btn-primary-bg);
  color: var(--color-btn-primary-fg);
}

.btn-primary:hover {
  background-color: var(--color-btn-primary-hover);
  color: var(--color-btn-primary-fg);
}

.btn-secondary {
  background-color: var(--color-btn-secondary-bg);
  color: var(--color-btn-secondary-fg);
}

.btn-secondary:hover {
  background-color: var(--color-btn-secondary-hover);
  color: var(--color-btn-secondary-fg);
}

/* ---------- Social Links ---------- */
.social-link {
  display: inline-block;
  padding: 0.25rem;
  margin: -0.25rem;
  text-decoration: none;
}

.social-link svg {
  width: 1.5rem;
  height: 1.5rem;
  fill: var(--color-fg-subtle);
  transition: fill var(--transition-fast);
}

.social-link:hover svg {
  fill: var(--color-fg-muted);
}

/* ---------- Hero Grid ---------- */
.hero-grid {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: clamp(1rem, 4vw, 4rem);
}
.hero-text {
  flex: 1 1 55%;
}
.hero-image {
  flex: 1 1 45%;
  display: flex;
  justify-content: center;
}

.hero-image-wrap {
  max-width: 20rem;
  width: 100%;
  padding: 0 0.625rem;
}

@media (min-width: 1024px) {
  .hero-image-wrap {
    max-width: 100%;
  }
}

.hero-headshot {
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-xl);
  background-color: var(--color-bg-card);
  transform: rotate(3deg);
  transition: transform var(--transition-base);
}

.hero-headshot:hover {
  transform: rotate(0deg) scale(1.02);
}

.social-row {
  display: flex;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.cta-area {
  margin-top: clamp(1.5rem, 5vw, 8rem);
}

/* ---------- Memorization Tool ---------- */
.mem-source-input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 1rem;
  font-family: var(--font-sans);
  background-color: transparent;
  color: var(--color-fg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  -webkit-text-security: disc;
}

.mem-source-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.mem-settings {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
  font-size: 0.875rem;
  color: var(--color-fg-muted);
}

.mem-settings label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.mem-settings input[type="checkbox"] {
  accent-color: var(--color-accent);
  border-radius: 0.25rem;
}

.mem-mode-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.mem-mode-btn {
  padding: 0.25rem 0.75rem;
  font-size: 0.875rem;
  font-family: var(--font-sans);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  background-color: var(--color-btn-secondary-bg);
  color: var(--color-fg-muted);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.mem-mode-btn:hover {
  background-color: var(--color-btn-secondary-hover);
}

.mem-mode-btn.active {
  background-color: var(--color-accent);
  color: #fff;
}

.mem-controls-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.mem-controls-row .mem-mode-group {
  margin-bottom: 0;
}

/* Locked / disabled state for settings */
.mem-locked {
  opacity: 0.45;
  pointer-events: none;
}

.mem-mode-btn:disabled {
  cursor: not-allowed;
}

/* Reset button */
.btn-reset {
  background-color: var(--color-incorrect);
  color: #fff;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  font-size: 0.875rem;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), opacity var(--transition-fast);
}

.btn-reset:hover {
  background-color: #dc2626;
  color: #fff;
}

.mem-passage-container {
  position: relative;
  min-height: 10rem;
  width: 100%;
}

.mem-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  padding: 1rem;
  font-size: 1rem;
  line-height: 1.75;
  font-family: var(--font-sans);
  background: transparent;
  color: transparent;
  caret-color: var(--color-accent);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  resize: none;
  overflow-y: hidden;
  white-space: pre-wrap;
  word-wrap: break-word;
  outline: none;
  z-index: 2;
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.mem-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.mem-input::placeholder {
  color: var(--color-fg-subtle);
  opacity: 1;
}

.mem-passage {
  width: 100%;
  min-height: 10rem;
  padding: 1rem;
  font-size: 1rem;
  line-height: 1.75;
  font-family: var(--font-sans);
  background-color: var(--color-bg-card);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  white-space: pre-wrap;
  word-wrap: break-word;
  z-index: 1;
  pointer-events: none;
}

.char-correct {
  color: var(--color-correct);
}

.char-incorrect {
  color: var(--color-incorrect);
  background-color: var(--color-incorrect-bg);
  border-radius: 2px;
}

.char-skipped {
  color: var(--color-fg-subtle);
}

.char-blank {
  color: transparent;
  border-bottom: 2px solid var(--color-fg-subtle);
  margin-right: 1px;
}

.char-blank-space {
  color: transparent;
}

/* ---------- 404 ---------- */
.not-found {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 4rem;
}

@media (min-width: 640px) {
  .not-found {
    padding-top: 8rem;
  }
}

.not-found .code {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-fg-subtle);
}

.not-found h1 {
  margin-top: 1rem;
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-fg);
}

@media (min-width: 640px) {
  .not-found h1 {
    font-size: 3rem;
  }
}

.not-found .desc {
  margin-top: 1rem;
  color: var(--color-fg-muted);
}

/* ---------- Fade-in Animation ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.5s ease-out both;
}

.fade-in-delay-1 {
  animation-delay: 0.1s;
}

.fade-in-delay-2 {
  animation-delay: 0.2s;
}

.fade-in-delay-3 {
  animation-delay: 0.3s;
}

/* ---------- HTMX transition ---------- */
.htmx-swapping {
  opacity: 0;
  transition: opacity 0.15s ease-out;
}

/* ---------- Utilities ---------- */
.mt-4 {
  margin-top: 1rem;
}

.mt-6 {
  margin-top: 1.5rem;
}

.mb-2 {
  margin-bottom: 0.5rem;
}

.mb-4 {
  margin-bottom: 1rem;
}

.space-y-7>*+* {
  margin-top: 1.75rem;
}