/* =========================================
   YouTube Money Calculator — style.css
   Mobile-first, pure CSS, no frameworks
   ========================================= */

/* ===== CSS VARIABLES ===== */
:root {
  /* Brand */
  --red:        #FF0000;
  --red-dark:   #CC0000;
  --red-light:  #FFF5F5;
  --green:      #16A34A;
  --green-light:#DCFCE7;
  --blue:       #2563EB;
  --blue-light: #EFF6FF;
  --orange:     #EA580C;

  /* Neutral */
  --bg:         #F9FAFB;
  --bg-alt:     #F3F4F6;
  --card:       #FFFFFF;
  --text:       #111827;
  --text-muted: #6B7280;
  --text-light: #9CA3AF;
  --border:     #E5E7EB;
  --border-dark:#D1D5DB;

  /* Effects */
  --shadow-xs:  0 1px 2px rgba(0,0,0,0.05);
  --shadow-sm:  0 1px 4px rgba(0,0,0,0.08);
  --shadow:     0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg:  0 8px 32px rgba(0,0,0,0.10);

  /* Spacing & Shape */
  --radius-sm:  8px;
  --radius:     12px;
  --radius-lg:  16px;
  --radius-xl:  20px;
  --transition: 0.18s ease;

  /* Typography */
  --font:       -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono:  'Fira Code', 'Cascadia Code', Consolas, monospace;

  /* Layout */
  --max-width:  1140px;
  --header-h:   64px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul {
  list-style: none;
}

/* ===== CONTAINER ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4 {
  line-height: 1.2;
  font-weight: 700;
  color: var(--text);
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.035em;
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.125rem);
  letter-spacing: -0.025em;
  margin-bottom: 12px;
}

h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

p {
  color: var(--text);
}

/* ===== UTILITY ===== */
.hidden {
  display: none !important;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--red);
  color: #fff;
  border-color: var(--red);
  box-shadow: 0 2px 8px rgba(255,0,0,0.25);
}

.btn-primary:hover {
  background: var(--red-dark);
  border-color: var(--red-dark);
  box-shadow: 0 4px 12px rgba(255,0,0,0.30);
  text-decoration: none;
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-dark);
}

.btn-ghost:hover {
  background: var(--bg-alt);
  text-decoration: none;
}

/* ===== HEADER ===== */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--header-h);
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  flex-shrink: 0;
}

.logo:hover {
  text-decoration: none;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--red);
  color: #fff;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: -1.5px;
  flex-shrink: 0;
}

.logo-text {
  font-size: 0.9375rem;
  white-space: nowrap;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.main-nav a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition);
}

.main-nav a:hover {
  color: var(--text);
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 8px;
  background: none;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: #fff;
  border-bottom: 1px solid var(--border);
  z-index: 199;
  flex-direction: column;
  padding: 8px 0 16px;
  box-shadow: var(--shadow);
}

.mobile-nav.open {
  display: flex;
}

.mobile-nav-link {
  display: block;
  padding: 12px 24px;
  color: var(--text);
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  transition: background var(--transition);
}

.mobile-nav-link:hover {
  background: var(--bg-alt);
}

/* ===== HERO ===== */
.hero {
  background: linear-gradient(145deg, #FFF5F5 0%, #FFFFFF 45%, #F0F9FF 100%);
  border-bottom: 1px solid var(--border);
  padding: 72px 0 64px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--green-light);
  color: var(--green);
  font-size: 0.8125rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.hero h1 {
  margin-bottom: 12px;
}

.hero-tagline {
  font-size: 1.1875rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-bottom: 12px;
}

.hero-desc {
  color: var(--text-muted);
  font-size: 0.9375rem;
  max-width: 560px;
  margin-bottom: 28px;
}

.hero-nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* Hero Stats */
.hero-stats {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
}

.stat-value {
  font-size: 1.625rem;
  font-weight: 800;
  color: var(--green);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ===== CALCULATOR SECTION ===== */
.calculator-section {
  padding: 64px 0 80px;
}

.calc-header {
  text-align: center;
  max-width: 620px;
  margin: 0 auto 32px;
}

.calc-header h2 {
  margin-bottom: 8px;
}

.calc-header p {
  color: var(--text-muted);
  font-size: 0.9375rem;
}

/* Calculator Card */
.calculator-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

/* ===== MODE TOGGLE ===== */
.mode-toggle {
  display: flex;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}

.mode-btn {
  flex: 1;
  padding: 16px 24px;
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: var(--font);
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
  margin-bottom: -1px;
}

.mode-btn.active {
  color: var(--red);
  background: var(--card);
  border-bottom-color: var(--red);
}

.mode-btn:hover:not(.active) {
  color: var(--text);
  background: #EBEBEB;
}

/* ===== FORM ===== */
.calc-panel {
  padding: 32px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.adv-top-grid {
  grid-template-columns: 1fr 1fr;
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
  line-height: 1.3;
}

.form-input {
  padding: 12px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
}

.form-input:focus {
  outline: none;
  border-color: var(--blue);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.form-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Slider */
.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  outline: none;
  cursor: pointer;
  margin: 6px 0 4px;
  background: var(--border);
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--red);
  cursor: pointer;
  border: 3px solid #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,0.22);
  transition: transform var(--transition);
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--red);
  cursor: pointer;
  border: 3px solid #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,0.22);
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-light);
}

.rpm-badge {
  background: var(--red);
  color: #fff;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: background var(--transition);
}

/* Content Type Toggle */
.content-type-toggle {
  display: flex;
  gap: 8px;
}

.content-btn {
  flex: 1;
  padding: 10px 14px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  font-size: 0.875rem;
  font-weight: 600;
  font-family: var(--font);
  color: var(--text-muted);
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
  text-align: center;
}

.content-btn.active {
  border-color: var(--red);
  color: var(--red);
  background: var(--red-light);
}

.content-btn:hover:not(.active) {
  border-color: var(--border-dark);
  color: var(--text);
}

/* ===== AUDIENCE SECTION ===== */
.audience-section {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 28px 32px;
  margin-top: 0;
}

.audience-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
  gap: 16px;
}

.audience-title {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.audience-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.pct-total-badge {
  white-space: nowrap;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-muted);
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: 100px;
  padding: 4px 14px;
  transition: color var(--transition), border-color var(--transition);
  flex-shrink: 0;
}

.pct-total-badge.valid {
  color: var(--green);
  border-color: #86EFAC;
  background: var(--green-light);
}

.pct-total-badge.invalid {
  color: #DC2626;
  border-color: #FECACA;
  background: #FEF2F2;
}

.pct-input-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
}

.pct-input {
  max-width: 80px;
  text-align: right;
}

.pct-symbol {
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.9375rem;
}

.flag {
  font-size: 1.125rem;
  line-height: 1;
}

.validation-msg {
  margin-top: 16px;
  padding: 12px 16px;
  background: #FEF2F2;
  border: 1px solid #FECACA;
  border-radius: var(--radius-sm);
  color: #DC2626;
  font-size: 0.875rem;
  font-weight: 500;
}

/* ===== ADVANCED OPTIONS ===== */
.adv-options-wrap {
  padding: 0 32px 0;
  border-bottom: 1px solid var(--border);
}

.adv-options {
  border-radius: 0;
}

.adv-options summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
  transition: color var(--transition);
}

.adv-options summary::-webkit-details-marker {
  display: none;
}

.adv-options summary::before {
  content: '▶';
  font-size: 0.65rem;
  transition: transform var(--transition);
  color: var(--text-light);
}

.adv-options[open] summary::before {
  transform: rotate(90deg);
}

.adv-options summary:hover {
  color: var(--text);
}

.summary-hint {
  font-weight: 400;
  color: var(--text-light);
}

.adv-options-inner {
  padding: 0 0 24px;
}

.custom-rpm-row {
  margin-bottom: 8px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  cursor: pointer;
  accent-color: var(--red);
}

/* ===== RESULTS ===== */
.results-section {
  padding: 32px;
  background: var(--bg-alt);
  border-top: 2px solid var(--border);
}

.results-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  gap: 12px;
}

.results-heading {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  margin: 0;
}

.results-mode-tag {
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: 100px;
  padding: 3px 12px;
  color: var(--text-muted);
}

/* Results Grid */
.results-grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 20px;
}

.result-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 18px;
  text-align: center;
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition);
}

.result-card:hover {
  box-shadow: var(--shadow-sm);
}

.result-card--main {
  background: linear-gradient(135deg, #ECFDF5 0%, #D1FAE5 100%);
  border-color: #6EE7B7;
}

.result-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.result-value {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.025em;
  line-height: 1.1;
}

.result-value--primary {
  font-size: 2rem;
  color: var(--green);
}

.result-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Comparison Card */
.comparison-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-xs);
}

.comparison-card-header {
  margin-bottom: 20px;
}

.comparison-card-header h3 {
  font-size: 0.9375rem;
  margin-bottom: 4px;
}

.comparison-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin: 0;
}

.comparison-grid {
  display: flex;
  align-items: stretch;
  gap: 16px;
}

.comparison-item {
  flex: 1;
  padding: 20px 16px;
  border-radius: var(--radius-sm);
  text-align: center;
}

.comparison-item--longform {
  background: linear-gradient(135deg, #EFF6FF, #DBEAFE);
  border: 1px solid #BFDBFE;
}

.comparison-item--shorts {
  background: linear-gradient(135deg, #FFF7ED, #FED7AA);
  border: 1px solid #FDBA74;
}

.comparison-type {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.comparison-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}

.comparison-rpm {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.comparison-divider {
  display: flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--text-light);
  letter-spacing: 0.05em;
  flex-shrink: 0;
  padding: 0 4px;
}

.comparison-note {
  margin-top: 12px;
  font-size: 0.8125rem;
  color: var(--text-muted);
  text-align: center;
}

/* Disclaimer */
.disclaimer {
  font-size: 0.8125rem;
  color: var(--text-muted);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  line-height: 1.5;
}

/* ===== CONTENT SECTIONS ===== */
.content-section {
  padding: 80px 0;
}

.content-section--alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.content-section > .container > p {
  max-width: 700px;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* Formula Highlight */
.formula-highlight {
  display: inline-block;
  background: var(--text);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  margin: 20px 0 32px;
  letter-spacing: 0.02em;
}

/* Info Grid */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.info-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.info-icon {
  font-size: 2rem;
  line-height: 1;
  margin-bottom: 14px;
}

.info-card h3 {
  margin-bottom: 8px;
}

.info-card p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin: 0;
}

/* CTA Inline */
.cta-inline {
  margin-top: 40px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.cta-inline p {
  margin: 0;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
}

/* ===== METRIC CARDS (CPM vs RPM) ===== */
.metric-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 32px;
}

.metric-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.metric-card--cpm {
  border-top: 4px solid #7C3AED;
}

.metric-card--rpm {
  border-top: 4px solid var(--green);
}

.metric-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.metric-header h3 {
  font-size: 1.75rem;
  margin: 0;
}

.metric-badge {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 100px;
}

.metric-card > p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.metric-example {
  background: var(--bg-alt);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.metric-facts {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.metric-facts li {
  font-size: 0.875rem;
  color: var(--text-muted);
  padding-left: 14px;
  position: relative;
}

.metric-facts li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--text-light);
  font-size: 1.25rem;
  line-height: 0.9;
}

/* Formula Box */
.formula-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--blue);
  border-radius: var(--radius-sm);
  padding: 24px 28px;
  margin-top: 28px;
}

.formula-box h3 {
  font-size: 0.9375rem;
  margin-bottom: 10px;
}

.formula-code {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  background: var(--bg-alt);
  border-radius: var(--radius-sm);
  padding: 12px 18px;
  margin-bottom: 12px;
  color: var(--text);
}

.formula-box > p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.formula-note {
  font-size: 0.8125rem !important;
  color: var(--text-light) !important;
}

/* ===== FORMAT CARDS (Shorts vs Long-form) ===== */
.format-compare {
  display: flex;
  align-items: stretch;
  gap: 24px;
  margin: 32px 0 24px;
}

.format-vs {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 800;
  color: var(--text-light);
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

.format-card {
  flex: 1;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.format-card--longform {
  border-top: 4px solid var(--blue);
}

.format-card--shorts {
  border-top: 4px solid var(--orange);
}

.format-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.format-card h3 {
  margin-bottom: 10px;
}

.format-rpm-badge {
  display: inline-block;
  background: var(--green-light);
  color: var(--green);
  font-size: 0.8125rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 16px;
}

.format-rpm-badge--low {
  background: #FEF3C7;
  color: #D97706;
}

.format-card ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.format-card li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding-left: 16px;
  position: relative;
}

.format-card li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--green);
  font-size: 0.75rem;
  top: 1px;
}

.format-example {
  background: var(--bg-alt);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Callout */
.callout {
  background: #FFFBEB;
  border: 1px solid #FDE68A;
  border-left: 4px solid #F59E0B;
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  font-size: 0.9375rem;
  color: #78350F;
  line-height: 1.65;
}

.callout a {
  color: #D97706;
  font-weight: 600;
}

/* ===== TABLES ===== */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  margin-top: 20px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  font-size: 0.9rem;
  min-width: 460px;
}

.data-table th {
  background: var(--bg-alt);
  padding: 13px 20px;
  text-align: left;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
}

.th-note {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.75rem;
  color: var(--text-light);
}

.data-table td {
  padding: 13px 20px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:hover td {
  background: var(--bg-alt);
}

.td-green {
  color: var(--green);
  font-weight: 600;
}

.tr-highlight td {
  background: linear-gradient(135deg, #ECFDF5, #D1FAE5);
  font-weight: 600;
}

.tr-highlight:hover td {
  background: #D1FAE5 !important;
}

.table-note {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 12px;
}

/* ===== FACTORS GRID ===== */
.factors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin-top: 32px;
}

.factor-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition), transform var(--transition);
}

.factor-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.factor-icon {
  font-size: 1.75rem;
  margin-bottom: 10px;
  line-height: 1;
}

.factor-card h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.factor-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin: 0;
}

/* ===== FAQ ===== */
.faq-list {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: box-shadow var(--transition);
}

.faq-item.open {
  box-shadow: var(--shadow-sm);
}

.faq-q {
  width: 100%;
  padding: 20px 24px;
  text-align: left;
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: background var(--transition);
  font-family: var(--font);
  line-height: 1.4;
}

.faq-q:hover {
  background: var(--bg-alt);
}

.faq-item.open .faq-q {
  background: var(--bg-alt);
}

.faq-icon {
  font-size: 1.375rem;
  font-weight: 400;
  color: var(--red);
  flex-shrink: 0;
  line-height: 1;
  transition: transform var(--transition);
  display: block;
  width: 24px;
  text-align: center;
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
}

.faq-a {
  padding: 0 24px 20px;
}

.faq-a[hidden] {
  display: none;
}

.faq-a p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  margin: 0;
  line-height: 1.7;
}

.faq-a a {
  color: var(--blue);
  font-weight: 500;
}

/* ===== FOOTER ===== */
.site-footer {
  background: #111827;
  color: #9CA3AF;
  padding: 64px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand {
  max-width: 320px;
}

.footer-logo .logo-text {
  color: #fff;
}

.footer-brand p {
  font-size: 0.875rem;
  color: #6B7280;
  margin-top: 12px;
  line-height: 1.65;
}

.footer-col h4 {
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 18px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  color: #6B7280;
  font-size: 0.875rem;
  text-decoration: none;
  transition: color var(--transition);
}

.footer-col a:hover {
  color: #fff;
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid #1F2937;
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: #4B5563;
  margin: 0;
}

/* ===== RESPONSIVE ===== */

/* Tablet */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .stat-card {
    flex: 1;
    min-width: 140px;
  }

  .metric-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .footer-brand {
    grid-column: 1 / -1;
    max-width: none;
  }

  .format-compare {
    flex-direction: column;
  }

  .format-vs {
    height: 24px;
  }
}

/* Mobile */
@media (max-width: 640px) {
  /* Nav */
  .main-nav {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  /* Hero */
  .hero {
    padding: 48px 0 40px;
  }

  .hero-nav {
    flex-direction: column;
  }

  .hero-nav .btn {
    width: 100%;
    text-align: center;
  }

  .hero-stats {
    flex-direction: column;
  }

  /* Calculator */
  .calculator-section {
    padding: 40px 0 56px;
  }

  .calc-panel {
    padding: 20px;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .adv-top-grid {
    grid-template-columns: 1fr;
  }

  .grid-4 {
    grid-template-columns: 1fr 1fr;
  }

  .audience-section {
    padding: 20px;
  }

  .audience-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .adv-options-wrap {
    padding: 0 20px;
  }

  /* Results */
  .results-section {
    padding: 20px;
  }

  .results-grid {
    grid-template-columns: 1fr 1fr;
  }

  .result-card--main {
    grid-column: 1 / -1;
  }

  .result-value--primary {
    font-size: 2.25rem;
  }

  .comparison-grid {
    flex-direction: column;
  }

  .comparison-divider {
    transform: none;
    height: 1px;
    background: var(--border);
    display: block;
    padding: 0;
    font-size: 0;
  }

  /* Content */
  .content-section {
    padding: 48px 0;
  }

  .cta-inline {
    flex-direction: column;
    align-items: flex-start;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-brand {
    grid-column: auto;
  }
}

@media (max-width: 400px) {
  .grid-4 {
    grid-template-columns: 1fr 1fr;
  }

  .results-grid {
    grid-template-columns: 1fr 1fr;
  }

  .content-type-toggle {
    flex-direction: column;
  }
}

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

  html {
    scroll-behavior: auto;
  }
}

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ===== PRINT ===== */
@media print {
  .site-header,
  .hero-nav,
  .cta-inline,
  .site-footer {
    display: none;
  }
}