/* ============================================
   Financial Calculator Solution
   Premium Design System
   ============================================ */

/* Import Fonts */
@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable.min.css');
@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&display=swap');

/* CSS Variables */
:root {
  /* Color Palette - Premium Finance Theme */
  --primary-900: #0d1b2a;
  --primary-800: #1b263b;
  --primary-700: #264653;
  --primary-600: #2a6f6e;
  --primary-500: #2a9d8f;
  
  --accent-gold: #e9c46a;
  --accent-orange: #f4a261;
  --accent-coral: #e76f51;
  
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;
  
  /* Neutrals */
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  
  /* Typography */
  --font-primary: 'Pretendard Variable', 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono: 'Space Mono', 'Consolas', monospace;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-glow: 0 0 40px rgba(42, 157, 143, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

/* 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;
  overflow-x: hidden;
}

body {
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-100);
  background: var(--primary-900);
  min-height: 100vh;
  overflow-x: hidden;
  width: 100%;
  max-width: 100vw;
  position: relative;
}

/* Prevent horizontal overflow */
html, body {
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}

/* When mobile menu is open, prevent body scroll */
body.menu-open {
  overflow: hidden !important;
  position: fixed;
  width: 100%;
}

img, video, iframe, embed, object {
  max-width: 100%;
  height: auto;
}

/* Prevent text overflow */
* {
  word-wrap: break-word;
  overflow-wrap: break-word;
}

/* Fix flexbox children overflow */
.calculator-box,
.results-box,
.summary-card,
.calc-card,
.info-box,
.chart-container {
  min-width: 0;
}

/* Background Pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(ellipse at 20% 20%, rgba(42, 157, 143, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(233, 196, 106, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(27, 38, 59, 0.8) 0%, transparent 100%);
  pointer-events: none;
  z-index: -1;
}

/* Grid Pattern Overlay */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(42, 157, 143, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 157, 143, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: -1;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.25rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: 1.25rem; }

p {
  color: var(--gray-300);
}

a {
  color: var(--primary-500);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Layout */
.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  overflow-x: hidden;
}

/* Page wrapper to prevent overflow */
.page-wrapper {
  width: 100%;
  max-width: 100vw;
  overflow-x: hidden;
}

.page-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  width: 100%;
  max-width: 100vw;
  overflow-x: hidden;
}

.main-content {
  flex: 1;
  padding: var(--space-8) 0;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
}

/* Header */
.header {
  background: rgba(13, 27, 42, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(42, 157, 143, 0.2);
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  max-width: 100vw;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
  position: relative;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-50);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-500), var(--accent-gold));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

/* Desktop Navigation */
.nav, .nav-desktop {
  display: flex;
  gap: var(--space-2);
}

.nav-link {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  color: var(--gray-300);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  background: rgba(42, 157, 143, 0.15);
  color: var(--primary-500);
}

/* Mobile Navigation (Outside Header - Full Screen Overlay) */
.nav-mobile {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100vw;
  height: 100vh;
  margin: 0;
  padding: 100px var(--space-6) var(--space-6);
  background: rgba(13, 27, 42, 0.99);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  flex-direction: column;
  justify-content: flex-start;
  align-items: stretch;
  gap: var(--space-3);
  z-index: 9999;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

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

.nav-mobile .nav-link {
  padding: var(--space-4) var(--space-5);
  font-size: 1.2rem;
  border-radius: var(--radius-lg);
  background: rgba(42, 157, 143, 0.15);
  text-align: center;
  color: var(--gray-100);
  border: 1px solid rgba(42, 157, 143, 0.3);
  display: block;
  width: 100%;
}

.nav-mobile .nav-link:hover,
.nav-mobile .nav-link.active {
  background: rgba(42, 157, 143, 0.3);
}

/* Ad Banner Space */
.ad-banner {
  background: linear-gradient(135deg, rgba(27, 38, 59, 0.8), rgba(38, 70, 83, 0.8));
  border: 1px dashed rgba(42, 157, 143, 0.3);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  text-align: center;
  margin: var(--space-6) 0;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
  font-size: 0.875rem;
}

.ad-sidebar {
  background: linear-gradient(180deg, rgba(27, 38, 59, 0.6), rgba(38, 70, 83, 0.6));
  border: 1px dashed rgba(42, 157, 143, 0.3);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  min-height: 250px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
  font-size: 0.875rem;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: var(--space-16) 0;
}

.hero-title {
  background: linear-gradient(135deg, var(--gray-50), var(--primary-500));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-4);
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--gray-400);
  max-width: 600px;
  margin: 0 auto var(--space-8);
}

/* Calculator Cards Grid */
.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-8);
  width: 100%;
  max-width: 100%;
}

.calc-card {
  background: linear-gradient(145deg, rgba(27, 38, 59, 0.9), rgba(13, 27, 42, 0.9));
  border: 1px solid rgba(42, 157, 143, 0.2);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.calc-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-500), var(--accent-gold));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.calc-card:hover {
  transform: translateY(-4px);
  border-color: rgba(42, 157, 143, 0.4);
  box-shadow: var(--shadow-glow);
}

.calc-card:hover::before {
  transform: scaleX(1);
}

.calc-card-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary-600), var(--primary-500));
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: var(--space-5);
}

.calc-card h3 {
  margin-bottom: var(--space-3);
  color: var(--gray-50);
}

.calc-card p {
  font-size: 0.9rem;
  margin-bottom: var(--space-6);
}

.calc-card-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--primary-500);
  font-weight: 600;
  font-size: 0.9rem;
}

.calc-card-cta svg {
  transition: transform var(--transition-fast);
}

.calc-card:hover .calc-card-cta svg {
  transform: translateX(4px);
}

/* Calculator Page Layout */
.calculator-layout {
  display: flex;
  justify-content: center;
  gap: var(--space-8);
  align-items: start;
  width: 100%;
  max-width: 100%;
}

@media (max-width: 1024px) {
  .calculator-layout {
    flex-direction: column;
    width: 100%;
    max-width: 100%;
  }
}

.calculator-main {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  width: 100%;
  max-width: 900px;
  min-width: 0; /* Fix for flex children overflow */
}

.calculator-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  position: sticky;
  top: 100px;
  width: 300px;
  flex-shrink: 0;
  min-width: 0;
}

/* Calculator Box */
.calculator-box {
  background: linear-gradient(145deg, rgba(27, 38, 59, 0.95), rgba(13, 27, 42, 0.95));
  border: 1px solid rgba(42, 157, 143, 0.2);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  backdrop-filter: blur(10px);
}

.calculator-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid rgba(42, 157, 143, 0.1);
}

.calculator-header-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--primary-600), var(--primary-500));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.calculator-header h1 {
  font-size: 1.75rem;
}

.calculator-header p {
  font-size: 0.9rem;
  margin-top: var(--space-1);
}

/* Form Elements */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-200);
  margin-bottom: var(--space-2);
}

.form-hint {
  font-size: 0.75rem;
  color: var(--gray-500);
  font-weight: 400;
  margin-left: var(--space-2);
}

.input-wrapper {
  position: relative;
}

.input-prefix,
.input-suffix {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-400);
  font-size: 0.9rem;
  font-weight: 500;
  pointer-events: none;
}

.input-prefix {
  left: var(--space-4);
}

.input-suffix {
  right: var(--space-4);
}

input[type="text"],
input[type="number"],
select {
  width: 100%;
  padding: var(--space-4);
  background: rgba(13, 27, 42, 0.8);
  border: 1px solid rgba(42, 157, 143, 0.2);
  border-radius: var(--radius-md);
  color: var(--gray-100);
  font-family: var(--font-mono);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

input[type="number"] {
  text-align: right;
}

input.has-prefix {
  padding-left: var(--space-10);
}

input.has-suffix {
  padding-right: var(--space-12);
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px rgba(42, 157, 143, 0.2);
}

input::placeholder {
  color: var(--gray-600);
}

/* Select Dropdown */
select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-10);
  cursor: pointer;
}

/* Range Slider */
.range-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: rgba(42, 157, 143, 0.2);
  border-radius: var(--radius-full);
  outline: none;
  margin: var(--space-3) 0;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: linear-gradient(135deg, var(--primary-500), var(--accent-gold));
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.range-values {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--gray-500);
}

/* Button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6);
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
  color: white;
  box-shadow: 0 4px 14px rgba(42, 157, 143, 0.4);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(42, 157, 143, 0.5);
}

.btn-secondary {
  background: rgba(42, 157, 143, 0.1);
  color: var(--primary-500);
  border: 1px solid rgba(42, 157, 143, 0.3);
}

.btn-secondary:hover {
  background: rgba(42, 157, 143, 0.2);
}

.btn-lg {
  padding: var(--space-5) var(--space-8);
  font-size: 1.1rem;
}

.btn-block {
  width: 100%;
}

/* Results Box */
.results-box {
  background: linear-gradient(145deg, rgba(42, 157, 143, 0.1), rgba(27, 38, 59, 0.9));
  border: 1px solid rgba(42, 157, 143, 0.3);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin-top: var(--space-6);
}

.results-title {
  font-size: 1rem;
  color: var(--gray-400);
  margin-bottom: var(--space-6);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) 0;
  border-bottom: 1px solid rgba(42, 157, 143, 0.1);
}

.result-item:last-child {
  border-bottom: none;
}

.result-label {
  font-size: 0.9rem;
  color: var(--gray-400);
}

.result-value {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-50);
}

.result-value.highlight {
  color: var(--primary-500);
  font-size: 1.5rem;
}

.result-value.success {
  color: var(--success);
}

.result-value.warning {
  color: var(--warning);
}

/* Summary Cards */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  width: 100%;
  max-width: 100%;
}

.summary-card {
  background: rgba(13, 27, 42, 0.6);
  border: 1px solid rgba(42, 157, 143, 0.15);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: center;
}

.summary-card-label {
  font-size: 0.8rem;
  color: var(--gray-500);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.summary-card-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-50);
}

.summary-card-value.primary {
  color: var(--primary-500);
}

.summary-card-value.gold {
  color: var(--accent-gold);
}

/* Chart Container */
.chart-container {
  background: rgba(13, 27, 42, 0.5);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-top: var(--space-6);
  width: 100%;
  max-width: 100%;
  overflow: hidden;
}

.chart-title {
  font-size: 1rem;
  color: var(--gray-300);
  margin-bottom: var(--space-4);
}

.chart-wrapper {
  position: relative;
  height: 300px;
}

/* Table */
.table-container {
  overflow-x: auto;
  margin-top: var(--space-6);
  width: 100%;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.data-table th,
.data-table td {
  padding: var(--space-3) var(--space-4);
  text-align: right;
  border-bottom: 1px solid rgba(42, 157, 143, 0.1);
}

.data-table th {
  color: var(--gray-400);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

.data-table th:first-child,
.data-table td:first-child {
  text-align: left;
}

.data-table td {
  font-family: var(--font-mono);
  color: var(--gray-200);
}

.data-table tr:hover {
  background: rgba(42, 157, 143, 0.05);
}

/* Entry Row (for dynamic inputs) */
.entry-row {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: var(--space-3);
  padding: var(--space-3);
  background: rgba(13, 27, 42, 0.5);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
  align-items: center;
}

.entry-row input {
  padding: var(--space-3);
  font-size: 0.9rem;
}

.btn-remove {
  width: 36px;
  height: 36px;
  padding: 0;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--danger);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-remove:hover {
  background: rgba(239, 68, 68, 0.2);
}

.btn-add {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-3);
  background: rgba(42, 157, 143, 0.1);
  border: 1px dashed rgba(42, 157, 143, 0.3);
  color: var(--primary-500);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.btn-add:hover {
  background: rgba(42, 157, 143, 0.2);
  border-style: solid;
}

/* Tabs */
.tabs {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  border-bottom: 1px solid rgba(42, 157, 143, 0.2);
  padding-bottom: var(--space-2);
}

.tab-btn {
  padding: var(--space-3) var(--space-5);
  background: transparent;
  border: none;
  color: var(--gray-400);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--gray-200);
  background: rgba(42, 157, 143, 0.1);
}

.tab-btn.active {
  color: var(--primary-500);
  background: rgba(42, 157, 143, 0.15);
  border-bottom: 2px solid var(--primary-500);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Info Box */
.info-box {
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-top: var(--space-6);
}

.info-box-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--info);
  margin-bottom: var(--space-2);
}

.info-box p {
  font-size: 0.85rem;
  color: var(--gray-400);
  line-height: 1.6;
}

/* Footer */
.footer {
  background: rgba(13, 27, 42, 0.9);
  border-top: 1px solid rgba(42, 157, 143, 0.1);
  padding: var(--space-8) 0;
  margin-top: var(--space-16);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-text {
  color: var(--gray-500);
  font-size: 0.875rem;
}

.footer-links {
  display: flex;
  gap: var(--space-6);
}

.footer-links a {
  color: var(--gray-400);
  font-size: 0.875rem;
}

/* Mobile Menu */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--gray-300);
  cursor: pointer;
  padding: var(--space-2);
  z-index: 1000;
  position: relative;
}

.mobile-menu-btn svg {
  display: block;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.animate-fade-in {
  animation: fadeIn 0.5s ease forwards;
}

.animate-slide-in {
  animation: slideIn 0.5s ease forwards;
}

/* Staggered Animation */
.stagger-1 { animation-delay: 0.1s; opacity: 0; }
.stagger-2 { animation-delay: 0.2s; opacity: 0; }
.stagger-3 { animation-delay: 0.3s; opacity: 0; }
.stagger-4 { animation-delay: 0.4s; opacity: 0; }

/* ============================================
   UTILITY CLASSES FOR MOBILE
   ============================================ */

/* Hide on mobile */
.hide-mobile {
  display: block;
}

/* Show only on mobile */
.show-mobile {
  display: none;
}

/* Text truncation */
.text-truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Scrollable container */
.scroll-x {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

/* Flex utilities */
.flex-col-mobile {
  display: flex;
}

/* Grid gap utilities */
.gap-responsive {
  gap: var(--space-4);
}

/* Font size utilities */
.text-responsive-lg {
  font-size: 1.5rem;
}

.text-responsive-xl {
  font-size: 2rem;
}

.text-responsive-2xl {
  font-size: 2.5rem;
}

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

/* Tablet (1024px and below) */
@media (max-width: 1024px) {
  .calculator-sidebar {
    position: static;
  }
  
  .ad-sidebar {
    min-height: 150px;
  }
}

/* Mobile Large (768px and below) */
@media (max-width: 768px) {
  /* Prevent overflow on mobile */
  html, body, .page-wrapper {
    overflow-x: hidden !important;
    width: 100% !important;
    max-width: 100% !important;
  }
  
  /* Container */
  .container {
    padding: 0 var(--space-4);
    width: 100%;
    max-width: 100%;
  }
  
  /* Header on mobile - remove overflow restrictions */
  .header {
    position: fixed !important;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    width: 100%;
    overflow: visible !important;
  }
  
  .header .container,
  .header .header-inner {
    overflow: visible !important;
  }
  
  /* Add padding to body to compensate for fixed header */
  .main-content {
    padding-top: 76px !important;
    padding-bottom: var(--space-4);
  }
  
  /* Hide desktop nav, show mobile menu button */
  .nav-desktop {
    display: none !important;
  }
  
  .mobile-menu-btn {
    display: block;
    z-index: 10000 !important;
    position: relative;
  }
  
  /* Logo */
  .logo {
    font-size: 1.25rem;
  }
  
  .logo-icon {
    width: 36px;
    height: 36px;
    font-size: 1.1rem;
  }
  
  /* Hero */
  .hero {
    padding: var(--space-8) 0;
  }
  
  .hero-subtitle {
    font-size: 1rem;
    padding: 0 var(--space-2);
  }
  
  /* Main Content */
  .main-content {
    padding-top: 72px !important;
    padding-left: 0;
    padding-right: 0;
    padding-bottom: var(--space-4);
  }
  
  /* Calculator Box */
  .calculator-box {
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 100%;
  }
  
  /* Results Box */
  .results-box {
    width: 100%;
    max-width: 100%;
  }
  
  /* Input fields */
  input[type="text"],
  input[type="number"],
  select {
    width: 100%;
    max-width: 100%;
  }
  
  /* Input wrapper */
  .input-wrapper {
    width: 100%;
    max-width: 100%;
  }
  
  /* Form group */
  .form-group {
    width: 100%;
    max-width: 100%;
  }
  
  /* Calculator Header */
  .calculator-header {
    flex-direction: column;
    text-align: center;
    gap: var(--space-3);
    margin-bottom: var(--space-5);
    padding-bottom: var(--space-4);
  }
  
  .calculator-header-icon {
    width: 48px;
    height: 48px;
    font-size: 1.25rem;
  }
  
  .calculator-header h1 {
    font-size: 1.35rem;
  }
  
  .calculator-header p {
    font-size: 0.85rem;
  }
  
  /* Results Box */
  .results-box {
    padding: var(--space-4);
    margin-top: var(--space-4);
  }
  
  .results-title {
    font-size: 0.85rem;
    margin-bottom: var(--space-4);
  }
  
  /* Summary Grid */
  .summary-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3);
  }
  
  .summary-card {
    padding: var(--space-3);
  }
  
  .summary-card-label {
    font-size: 0.7rem;
  }
  
  .summary-card-value {
    font-size: 1.1rem;
  }
  
  /* Result Items */
  .result-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
    padding: var(--space-3) 0;
  }
  
  .result-value {
    font-size: 1.1rem;
  }
  
  .result-value.highlight {
    font-size: 1.25rem;
  }
  
  /* Chart */
  .chart-container {
    padding: var(--space-4);
  }
  
  .chart-wrapper {
    height: 250px;
  }
  
  .chart-title {
    font-size: 0.9rem;
  }
  
  /* Table */
  .data-table {
    font-size: 0.75rem;
  }
  
  .data-table th,
  .data-table td {
    padding: var(--space-2) var(--space-2);
    white-space: nowrap;
  }
  
  .data-table th {
    font-size: 0.65rem;
  }
  
  /* Form Elements */
  .form-label {
    font-size: 0.8rem;
  }
  
  .form-hint {
    display: block;
    margin-left: 0;
    margin-top: var(--space-1);
  }
  
  input[type="text"],
  input[type="number"],
  select {
    padding: var(--space-3);
    font-size: 16px; /* Prevent zoom on iOS */
  }
  
  /* Entry Row */
  .entry-row {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2);
  }
  
  .entry-row .btn-remove {
    grid-column: span 2;
    width: 100%;
    height: 32px;
  }
  
  /* Buttons */
  .btn {
    padding: var(--space-3) var(--space-4);
    font-size: 0.95rem;
  }
  
  .btn-lg {
    padding: var(--space-4) var(--space-6);
    font-size: 1rem;
  }
  
  /* Tabs */
  .tabs {
    gap: var(--space-1);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  
  .tabs::-webkit-scrollbar {
    display: none;
  }
  
  .tab-btn {
    padding: var(--space-2) var(--space-3);
    font-size: 0.8rem;
    white-space: nowrap;
    flex-shrink: 0;
  }
  
  /* Info Box */
  .info-box {
    padding: var(--space-3);
  }
  
  .info-box-title {
    font-size: 0.85rem;
  }
  
  .info-box p {
    font-size: 0.8rem;
  }
  
  /* Ad Banners */
  .ad-banner {
    padding: var(--space-4);
    min-height: 80px;
    margin: var(--space-4) 0;
    font-size: 0.75rem;
    width: 100%;
    max-width: 100%;
  }
  
  .ad-sidebar {
    min-height: 150px;
    padding: var(--space-3);
    width: 100%;
    max-width: 100%;
  }
  
  /* Range slider fix */
  .range-slider {
    width: 100%;
    max-width: 100%;
  }
  
  .range-values {
    width: 100%;
    max-width: 100%;
  }
  
  /* Calculator Cards */
  .calc-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  
  .calc-card {
    padding: var(--space-5);
  }
  
  .calc-card-icon {
    width: 52px;
    height: 52px;
    font-size: 1.5rem;
  }
  
  /* Footer */
  .footer {
    padding: var(--space-6) 0;
    margin-top: var(--space-8);
  }
  
  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: var(--space-3);
  }
  
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4);
  }
  
  .footer-links a {
    font-size: 0.8rem;
  }
}

/* Mobile Small (480px and below) */
@media (max-width: 480px) {
  /* Force no overflow */
  html, body, .page-wrapper, .main-content, .container {
    overflow-x: hidden !important;
    width: 100% !important;
    max-width: 100% !important;
  }
  
  /* Container */
  .container {
    padding: 0 var(--space-3);
  }
  
  /* Calculator cards */
  .calc-grid {
    grid-template-columns: 1fr;
  }
  
  /* Typography */
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.25rem; }
  h3 { font-size: 1.1rem; }
  h4 { font-size: 1rem; }
  
  /* Hero */
  .hero {
    padding: var(--space-6) 0;
  }
  
  .hero-subtitle {
    font-size: 0.9rem;
  }
  
  /* Calculator Header */
  .calculator-header h1 {
    font-size: 1.2rem;
  }
  
  /* Summary Grid - Stack on very small screens */
  .summary-grid {
    grid-template-columns: 1fr;
  }
  
  .summary-card-value {
    font-size: 1.25rem;
  }
  
  /* Chart */
  .chart-wrapper {
    height: 220px;
  }
  
  /* Table - Smaller text */
  .data-table {
    font-size: 0.7rem;
  }
  
  .data-table th,
  .data-table td {
    padding: var(--space-2) var(--space-1);
  }
  
  /* Entry Row - Stack completely */
  .entry-row {
    grid-template-columns: 1fr;
  }
  
  .entry-row .btn-remove {
    grid-column: span 1;
  }
  
  /* Range Slider Values */
  .range-values {
    font-size: 0.65rem;
  }
  
  /* Buttons */
  .btn-lg {
    padding: var(--space-3) var(--space-4);
    font-size: 0.95rem;
  }
  
  /* Utility classes for 480px */
  .hide-mobile {
    display: none;
  }
  
  .show-mobile {
    display: block;
  }
  
  .flex-col-mobile {
    flex-direction: column;
  }
  
  .gap-responsive {
    gap: var(--space-2);
  }
  
  .text-responsive-lg {
    font-size: 1.1rem;
  }
  
  .text-responsive-xl {
    font-size: 1.5rem;
  }
  
  .text-responsive-2xl {
    font-size: 1.75rem;
  }
}

/* Mobile Medium (600px) utility breakpoint */
@media (max-width: 600px) {
  .text-responsive-lg {
    font-size: 1.25rem;
  }
  
  .text-responsive-xl {
    font-size: 1.75rem;
  }
  
  .text-responsive-2xl {
    font-size: 2rem;
  }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
  /* Larger touch targets */
  .nav-link {
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .btn {
    min-height: 44px;
  }
  
  .tab-btn {
    min-height: 40px;
  }
  
  /* Disable hover effects */
  .calc-card:hover {
    transform: none;
  }
  
  .calc-card:active {
    transform: scale(0.98);
  }
  
  .btn-primary:hover {
    transform: none;
  }
  
  .btn-primary:active {
    transform: scale(0.98);
  }
  
  /* Range slider larger thumb */
  .range-slider::-webkit-slider-thumb {
    width: 28px;
    height: 28px;
  }
}

/* Landscape mode on phones */
@media (max-height: 500px) and (orientation: landscape) {
  .hero {
    padding: var(--space-4) 0;
  }
  
  .calculator-header {
    flex-direction: row;
    text-align: left;
  }
  
  .chart-wrapper {
    height: 200px;
  }
}

/* Safe area for notched devices */
@supports (padding: max(0px)) {
  .header {
    padding-left: max(var(--space-4), env(safe-area-inset-left));
    padding-right: max(var(--space-4), env(safe-area-inset-right));
  }
  
  .footer {
    padding-bottom: max(var(--space-8), env(safe-area-inset-bottom));
  }
}

/* Print Styles */
@media print {
  body::before,
  body::after,
  .header,
  .footer,
  .ad-banner,
  .ad-sidebar,
  .btn {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .calculator-box {
    border: 1px solid #ccc;
    background: white;
  }
}