/* ═══════════════════════════════════════════════════════════════
   CalcHub — Main Stylesheet
   Stitch-Inspired Material You (MD3) Design System
   ═══════════════════════════════════════════════════════════════ */

/* ──────────────────────────────────────────────────────────────
   RESET & BASE
   ────────────────────────────────────────────────────────────── */

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

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

body {
  font-family: var(--md-font);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.65;
  color: var(--md-on-surface);
  background-color: var(--md-background);
  transition: background-color var(--md-duration) var(--md-easing),
              color var(--md-duration) var(--md-easing);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ──────────────────────────────────────────────────────────────
   TYPOGRAPHY
   ────────────────────────────────────────────────────────────── */

h1 { font-size: clamp(2.4rem, 5vw, 3.5rem); font-weight: 700; letter-spacing: -0.01em; line-height: 1.15; margin-bottom: 20px; }
h2 { font-size: 2rem; font-weight: 700; line-height: 1.25; margin-bottom: 16px; }
h3 { font-size: 1.375rem; font-weight: 600; line-height: 1.35; margin-bottom: 12px; }
h4 { font-size: 1.125rem; font-weight: 600; margin-bottom: 8px; }
h5 { font-size: 1rem; font-weight: 500; margin-bottom: 8px; }
h6 { font-size: 0.875rem; font-weight: 500; margin-bottom: 8px; }
p { margin-bottom: 16px; }

a {
  color: var(--md-primary);
  text-decoration: none;
  transition: color var(--md-duration-fast) var(--md-easing);
}
a:hover { color: color-mix(in srgb, var(--md-primary) 80%, transparent); }

/* ──────────────────────────────────────────────────────────────
   BUTTONS — Strict Pill Shape, No Exceptions
   ────────────────────────────────────────────────────────────── */

button {
  font-family: var(--md-font);
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: all var(--md-duration-fast) var(--md-easing);
}

.btn-md-filled {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--md-primary);
  color: var(--md-on-primary);
  border: none;
  border-radius: var(--md-radius-full);
  padding: 0 28px;
  height: 44px;
  font-family: var(--md-font);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: all 200ms cubic-bezier(0.2, 0, 0, 1);
  text-decoration: none;
  justify-content: center;
  white-space: nowrap;
}
.btn-md-filled:hover {
  background: color-mix(in srgb, var(--md-primary) 88%, transparent);
  box-shadow: 0 2px 12px rgba(103, 80, 164, 0.25);
  transform: translateY(-1px);
  color: var(--md-on-primary);
  text-decoration: none;
}
.btn-md-filled:active { transform: scale(0.95); box-shadow: none; }
.btn-md-filled:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-md-tonal {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  border: none;
  border-radius: var(--md-radius-full);
  padding: 0 24px;
  height: 44px;
  font-family: var(--md-font);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 200ms cubic-bezier(0.2, 0, 0, 1);
  text-decoration: none;
  justify-content: center;
  white-space: nowrap;
}
.btn-md-tonal:hover {
  background: color-mix(in srgb, var(--md-secondary-container) 85%, var(--md-primary) 15%);
  box-shadow: var(--md-shadow-2);
  transform: translateY(-1px);
  color: var(--md-on-secondary-container);
  text-decoration: none;
}
.btn-md-tonal:active { transform: scale(0.95); }

.btn-md-outlined {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--md-primary);
  border: 1.5px solid var(--md-outline);
  border-radius: var(--md-radius-full);
  padding: 0 24px;
  height: 44px;
  font-family: var(--md-font);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 200ms cubic-bezier(0.2, 0, 0, 1);
  text-decoration: none;
  justify-content: center;
  white-space: nowrap;
}
.btn-md-outlined:hover {
  background: color-mix(in srgb, var(--md-primary) 8%, transparent);
  border-color: var(--md-primary);
  color: var(--md-primary);
  text-decoration: none;
}
.btn-md-outlined:active { transform: scale(0.95); }

.btn-md-text {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--md-primary);
  border: none;
  border-radius: var(--md-radius-full);
  padding: 0 16px;
  height: 40px;
  font-family: var(--md-font);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 200ms cubic-bezier(0.2, 0, 0, 1);
  text-decoration: none;
  justify-content: center;
}
.btn-md-text:hover {
  background: color-mix(in srgb, var(--md-primary) 8%, transparent);
  color: var(--md-primary);
  text-decoration: none;
}

.btn-lg { height: 52px; padding: 0 36px; font-size: 1rem; }
.btn-sm { height: 36px; padding: 0 16px; font-size: 0.8rem; }

/* ──────────────────────────────────────────────────────────────
   FORMS — Filled Text Field Style (MD3)
   ────────────────────────────────────────────────────────────── */

.form-group { margin-bottom: 24px; }

label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--md-on-surface-variant);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
input[type="time"],
input[type="search"],
textarea,
select {
  width: 100%;
  background: var(--md-surface-container-low);
  border: none;
  border-bottom: 2px solid var(--md-outline);
  border-radius: var(--md-radius-sm) var(--md-radius-sm) 0 0;
  padding: 16px;
  font-family: var(--md-font);
  font-size: 1rem;
  color: var(--md-on-surface);
  height: 56px;
  outline: none;
  transition: border-color var(--md-duration-fast) var(--md-easing);
}
input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
input[type="date"]:focus,
input[type="time"]:focus,
input[type="search"]:focus,
textarea:focus,
select:focus {
  border-bottom-color: var(--md-primary);
  box-shadow: none;
  outline: none;
}
textarea { height: auto; min-height: 120px; resize: vertical; }

/* MD3 filled field wrapper */
.md-field { display: flex; flex-direction: column; gap: 4px; }
.md-field label { font-size: 0.875rem; font-weight: 500; color: var(--md-on-surface-variant); margin-bottom: 0; }
.md-field input, .md-field select, .md-field textarea {
  background: var(--md-surface-container-low);
  border: none;
  border-bottom: 2px solid var(--md-outline);
  border-radius: var(--md-radius-sm) var(--md-radius-sm) 0 0;
  padding: 16px;
  font-family: var(--md-font);
  font-size: 1rem;
  color: var(--md-on-surface);
  height: 56px;
  outline: none;
  transition: border-color var(--md-duration-fast) var(--md-easing);
  width: 100%;
}
.md-field textarea { height: auto; min-height: 120px; }
.md-field input:focus, .md-field select:focus, .md-field textarea:focus { border-bottom-color: var(--md-primary); }

/* ──────────────────────────────────────────────────────────────
   CARDS — MD3 Spec
   ────────────────────────────────────────────────────────────── */

.md-card {
  background: var(--md-surface-container);
  border-radius: var(--md-radius-lg);
  padding: 24px;
  box-shadow: var(--md-shadow-1);
  transition: box-shadow 300ms cubic-bezier(0.2, 0, 0, 1),
              transform 300ms cubic-bezier(0.2, 0, 0, 1);
}
.md-card:hover { box-shadow: var(--md-shadow-2); }

.md-card-interactive {
  transition: transform 300ms cubic-bezier(0.2, 0, 0, 1),
              box-shadow 300ms cubic-bezier(0.2, 0, 0, 1);
  cursor: pointer;
}
.md-card-interactive:hover {
  transform: scale(1.02) translateY(-2px);
  box-shadow: 0 8px 28px rgba(103, 80, 164, 0.14);
}
.md-card-interactive:active { transform: scale(0.98); }

.card {
  padding: 24px;
  border-radius: var(--md-radius-lg);
  background: var(--md-surface-container);
  box-shadow: var(--md-shadow-1);
  transition: all var(--md-duration-fast) var(--md-easing);
}
.card:hover { box-shadow: var(--md-shadow-2); transform: translateY(-2px); }

/* ──────────────────────────────────────────────────────────────
   RESULT HERO — Tool Result Display
   ────────────────────────────────────────────────────────────── */

.md-result-hero {
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--md-primary) 10%, var(--md-surface-container)),
    var(--md-surface-container) 70%);
  border-radius: var(--md-radius-2xl);
  padding: 40px 32px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(103, 80, 164, 0.1);
  animation: md-scale-in 300ms cubic-bezier(0.2, 0, 0, 1);
}
.md-result-hero .result-primary {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: var(--md-primary);
  line-height: 1.2;
}
.md-result-hero .result-secondary {
  font-size: 1.1rem;
  color: var(--md-on-surface-variant);
  margin-top: 8px;
}

/* ──────────────────────────────────────────────────────────────
   BLUR SHAPES — Organic MD3 Atmosphere
   ────────────────────────────────────────────────────────────── */

.blur-shape {
  position: absolute;
  border-radius: var(--md-radius-full);
  filter: blur(64px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.12;
}
.blur-shape-primary { background: var(--md-primary); }
.blur-shape-secondary { background: var(--md-secondary-container); }
.blur-shape-tertiary { background: var(--md-tertiary); }

/* ──────────────────────────────────────────────────────────────
   SECTION CONTAINERS
   ────────────────────────────────────────────────────────────── */

.md-section { padding: 80px 0; position: relative; overflow: hidden; }
.md-section-tonal { background: var(--md-surface-container); }

/* ──────────────────────────────────────────────────────────────
   NAV / HEADER
   ────────────────────────────────────────────────────────────── */

.site-header {
  background: color-mix(in srgb, var(--md-surface) 92%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid color-mix(in srgb, var(--md-outline) 15%, transparent);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: background var(--md-duration) var(--md-easing);
}

/* ──────────────────────────────────────────────────────────────
   LAYOUT UTILITIES
   ────────────────────────────────────────────────────────────── */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
@media (max-width: 768px) { .container { padding: 0 16px; } }

main { flex: 1; }

.text-center { text-align: center; }
.text-muted { color: var(--md-on-surface-variant); }
.text-primary { color: var(--md-primary); }

/* Breadcrumbs */
.breadcrumbs {
  padding: 12px 0;
  background: transparent;
}
.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  font-size: 0.875rem;
  color: var(--md-on-surface-variant);
}
.breadcrumb-list li:not(:last-child)::after { content: '›'; margin-left: 8px; opacity: 0.5; }
.breadcrumb-list a { color: var(--md-primary); text-decoration: none; }
.breadcrumb-list a:hover { text-decoration: underline; }

/* Grid helpers */
.grid { display: grid; gap: 24px; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
@media (max-width: 768px) {
  .grid-cols-2, .grid-cols-3 { grid-template-columns: 1fr; }
}

/* Bootstrap row/col shims (without Bootstrap loaded) */
.row { display: flex; flex-wrap: wrap; margin: 0 -12px; }
.col-12 { width: 100%; padding: 0 12px; }
.col-lg-4 { padding: 0 12px; }
.col-lg-8 { padding: 0 12px; }
.g-4 { gap: 24px; }
@media (min-width: 992px) {
  .col-lg-4 { width: 33.333%; }
  .col-lg-8 { width: 66.667%; }
  .d-none { display: none !important; }
  .d-lg-block { display: block !important; }
}

/* ──────────────────────────────────────────────────────────────
   ADMIN LAYOUT
   ────────────────────────────────────────────────────────────── */

.admin-wrapper { display: flex; min-height: 100vh; background: var(--md-surface); }
.admin-content { flex: 1; display: flex; flex-direction: column; overflow-y: auto; }
.admin-sidebar {
  width: 260px;
  background: var(--md-surface-container);
  border-right: 1px solid color-mix(in srgb, var(--md-outline) 20%, transparent);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
.sidebar-header {
  padding: 24px;
  border-bottom: 1px solid color-mix(in srgb, var(--md-outline) 20%, transparent);
}
.sidebar-header h2 { font-size: 1.375rem; color: var(--md-primary); margin: 0; }
.sidebar-nav { flex: 1; padding: 16px 0; }
.nav-menu { list-style: none; padding: 0; margin: 0; }
.nav-item { display: flex; }
.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  color: var(--md-on-surface);
  text-decoration: none;
  transition: all var(--md-duration-fast) var(--md-easing);
  width: 100%;
  border-left: 3px solid transparent;
  font-size: 0.9rem;
  font-weight: 500;
}
.nav-link:hover { background: color-mix(in srgb, var(--md-primary) 8%, transparent); color: var(--md-primary); }
.nav-link.active { background: color-mix(in srgb, var(--md-primary) 12%, transparent); color: var(--md-primary); border-left-color: var(--md-primary); }
.sidebar-footer {
  padding: 16px;
  border-top: 1px solid color-mix(in srgb, var(--md-outline) 20%, transparent);
}
.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px;
  border-bottom: 1px solid color-mix(in srgb, var(--md-outline) 15%, transparent);
  background: var(--md-surface);
}
.admin-header h1 { font-size: 1.75rem; margin: 0 0 4px 0; }

/* ──────────────────────────────────────────────────────────────
   ALERTS / FEEDBACK
   ────────────────────────────────────────────────────────────── */

.alert {
  padding: 16px 20px;
  border-radius: var(--md-radius-md);
  margin-bottom: 16px;
  font-size: 0.9rem;
  font-weight: 500;
}
.alert-success { background: color-mix(in srgb, #4caf50 12%, var(--md-surface-container)); color: #1b5e20; }
.alert-error { background: color-mix(in srgb, var(--md-error) 12%, var(--md-surface-container)); color: var(--md-error); }
.alert-warning { background: color-mix(in srgb, #ff9800 12%, var(--md-surface-container)); color: #e65100; }

/* ──────────────────────────────────────────────────────────────
   BADGE / CHIP / PILL
   ────────────────────────────────────────────────────────────── */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: color-mix(in srgb, var(--md-primary-container) 70%, white);
  color: var(--md-primary);
  border: 1.5px solid color-mix(in srgb, var(--md-primary) 20%, transparent);
  border-radius: var(--md-radius-full);
  padding: 7px 18px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

/* ──────────────────────────────────────────────────────────────
   TOOL WRAPPER
   ────────────────────────────────────────────────────────────── */

#tool-wrapper {
  background: var(--md-surface-container);
  border-radius: var(--md-radius-2xl);
  padding: 32px;
  box-shadow: var(--md-shadow-1);
}

/* ──────────────────────────────────────────────────────────────
   PRINT
   ────────────────────────────────────────────────────────────── */

@media print {
  body { background: white; color: black; }
  .site-header, .site-footer, .no-print { display: none; }
}