/* === Brand: CSS Variables === */
:root {
  /* Typography */
  --font-body: 'DM Sans', sans-serif;
  --font-display: 'DM Serif Display', serif;

  /* Grey Scale */
  --grey-50:  #FAFAF9;
  --grey-100: #F5F5F4;
  --grey-200: #E7E5E4;
  --grey-300: #D6D3D1;
  --grey-400: #A8A29E;
  --grey-500: #78716C;
  --grey-600: #57534E;
  --grey-800: #292524;
  --grey-900: #1C1917;
  --grey-950: #0F0F0F;

  /* Accent */
  --pink: #FF2867;

  /* Semantic (Light Mode) */
  --bg: var(--grey-50);
  --surface: #FFFFFF;
  --text: var(--grey-900);
  --text-muted: var(--grey-600);
  --border: var(--grey-200);
  --accent: var(--pink);
  --accent-hover: #E6164F;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 50px rgba(0,0,0,0.12);

  /* Motion */
  --ease-out-quart: cubic-bezier(.165, .84, .44, 1);
  --ease-in-out-cubic: cubic-bezier(.645, .045, .355, 1);
  --dur-1: 120ms;
  --dur-2: 180ms;
  --dur-3: 240ms;
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;

  /* Sidebar */
  --sidebar-width: 220px;
  --sidebar-collapsed-width: 60px;
}

/* Dark Mode */
:root.dark {
  --bg: var(--grey-950);
  --surface: var(--grey-900);
  --text: var(--grey-50);
  --text-muted: var(--grey-400);
  --border: var(--grey-800);
  --accent-hover: #FF5088;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.4);
}

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 600;
}

h1 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 2.5rem;
}

h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--text); }

button, .btn {
  font-family: var(--font-body);
  font-weight: 500;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.btn-primary {
  background: var(--accent);
  color: white;
}
.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--text-muted);
}

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

/* === Display mode === */
@media (display-mode: standalone) {
  .hide-in-pwa { display: none !important; }
}
@media not (display-mode: standalone) {
  .hide-in-browser { display: none !important; }
}

/* === Layout === */
#app {
  display: flex;
  min-height: 100vh;
  min-height: 100dvh;
}

.app-content {
  flex: 1;
  min-width: 0;
  margin-left: var(--sidebar-collapsed-width);
  padding: var(--space-2xl) var(--space-xl);
  max-width: 800px;
  transition: margin-left var(--transition-normal);
}

@media (max-width: 768px) {
  .app-content {
    margin-left: var(--sidebar-collapsed-width);
    padding: var(--space-xl) var(--space-lg);
  }
}


/* === Sidebar ===
 * Two columns: icons (fixed) + labels (slides).
 * CSS Grid everywhere for rigid placement.
 */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  height: 100dvh;
  z-index: 200;
  display: grid;
  grid-template-columns: var(--sidebar-collapsed-width) 1fr;
  overflow: clip;
  isolation: isolate;
  pointer-events: none;
}

/* --- Icons column --- */
.sidebar-icons {
  grid-column: 1;
  display: grid;
  grid-template-rows: 56px 1fr auto;
  background: var(--surface);
  box-shadow: 1px 0 0 0 var(--border);
  pointer-events: auto;
  contain: strict;
  will-change: transform;
  transform: translateZ(0);
  z-index: 2;
}

.sidebar-header {
  grid-row: 1;
  display: grid;
  place-items: center;
  height: 56px;
}

.sidebar-nav {
  grid-row: 2;
  display: grid;
  grid-auto-rows: 48px;
  align-content: start;
}

.sidebar-actions {
  grid-row: 3;
  display: grid;
  grid-auto-rows: 48px;
  justify-items: center;
  box-shadow: 0 -1px 0 0 var(--border);
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin: 0 auto;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: var(--radius-md);
  cursor: pointer;
  padding: 0;
  transition: color 150ms ease, background-color 150ms ease;
}

.icon-btn:hover {
  color: var(--text);
  background: var(--grey-100);
}
:root.dark .icon-btn:hover {
  background: var(--grey-800);
}

.icon-btn.active {
  color: var(--accent);
  background: rgba(255, 40, 103, 0.08);
}

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

.toggle-btn svg {
  transition: transform var(--dur-3) var(--ease-out-quart);
}
.sidebar.collapsed .toggle-btn svg {
  transform: rotate(180deg);
}
@media (max-width: 768px) {
  .sidebar:not(.expanded) .toggle-btn svg {
    transform: rotate(180deg);
  }
}

/* --- Labels column --- */
.sidebar-labels {
  grid-column: 2;
  display: grid;
  grid-template-rows: 56px 1fr auto;
  background: var(--surface);
  box-shadow: 1px 0 0 0 var(--border);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  overflow: hidden;
  pointer-events: auto;
  transform: translateX(0);
  opacity: 1;
  transition:
    transform 240ms var(--ease-out-quart),
    opacity 200ms ease;
  will-change: transform, opacity;
  contain: layout style paint;
  z-index: 1;
}

.labels-header {
  grid-row: 1;
  display: grid;
  align-content: center;
  height: 56px;
  padding: 0 var(--space-md);
}

.labels-nav {
  grid-row: 2;
  display: grid;
  grid-auto-rows: 48px;
  align-content: start;
}

.labels-actions {
  grid-row: 3;
  display: grid;
  grid-auto-rows: 48px;
  box-shadow: 0 -1px 0 0 var(--border);
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 400;
  color: var(--text);
  white-space: nowrap;
}

.label-btn {
  height: 48px;
  display: grid;
  align-content: center;
  padding: 0 var(--space-md);
  border: none;
  background: none;
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  text-align: left;
  width: 100%;
  transition: color 150ms ease, background-color 150ms ease;
}

.label-btn:hover {
  color: var(--text);
  background: var(--grey-100);
}
:root.dark .label-btn:hover {
  background: var(--grey-800);
}

.label-btn.active {
  color: var(--accent);
  background: rgba(255, 40, 103, 0.08);
}

/* --- Collapsed: labels slide left behind the icons --- */
.sidebar.collapsed .sidebar-labels {
  transform: translateX(-100%);
  opacity: 0;
  pointer-events: none;
}

/* --- Mobile --- */
@media (max-width: 768px) {
  .sidebar:not(.expanded) .sidebar-labels {
    transform: translateX(-100%);
    opacity: 0;
    pointer-events: none;
  }
  .sidebar.expanded .sidebar-labels {
    box-shadow: var(--shadow-lg);
  }
}

/* Backdrop */
.sidebar-backdrop {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.3);
  z-index: 199;
  opacity: 0; pointer-events: none;
  transition: opacity var(--dur-3) var(--ease-out-quart);
}
.sidebar-backdrop.visible { opacity: 1; pointer-events: auto; }

/* === Overlay === */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.overlay-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  max-width: 400px;
  width: 100%;
}

.overlay-card h3 {
  margin-bottom: var(--space-md);
}

/* === Home View === */
.home-view {
  padding-top: var(--space-xl);
}

.hero {
  margin-bottom: var(--space-4xl);
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 3.5rem;
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  font-weight: 300;
  margin-bottom: var(--space-xl);
}

.hero-description {
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 540px;
  line-height: 1.7;
}

.features {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.feature-card {
  padding: var(--space-xl);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.feature-card h3 {
  margin-bottom: var(--space-sm);
  font-size: 1.125rem;
}

.feature-card p {
  color: var(--text-muted);
  line-height: 1.6;
}

@media (min-width: 640px) {
  .features {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--space-lg);
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2.5rem;
  }
}

/* === About View === */
.about-view,
.contact-view {
  padding-top: var(--space-xl);
}

.page-section {
  margin-bottom: var(--space-2xl);
}

.page-section h1 {
  margin-bottom: var(--space-md);
}

.page-section h2 {
  margin-bottom: var(--space-sm);
}

.page-section p {
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 600px;
}

.lead {
  font-size: 1.125rem;
  line-height: 1.7;
}

/* === Contact View === */
.contact-card {
  padding: var(--space-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-md);
}

.contact-card h3 {
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

.contact-card p {
  font-size: 1.0625rem;
}

/* === Not Found View === */
.not-found-view {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
}

.not-found-view h1 {
  font-size: 5rem;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.not-found-view p {
  color: var(--text-muted);
  margin-bottom: var(--space-xl);
}