/**
 * Calculadora de Piso Online
 * Desenvolvido por B20 Conteúdo Digital
 * https://www.b20.com.br
 * Todos os direitos reservados
 */

/* ========================================
   RESET E VARIÁVEIS CSS
   ======================================== */

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

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

:root {
    /* GoAdopt Visual Style (Light Mode Fallback) */
    --bg-canvas: #F8FAFC;
    --bg-surface: #FFFFFF;
    --primary-accent: #00DD80;
    --primary-hover: #00C270;
    --text-main: #0F172A;
    --text-muted: #334155;
    --border-subtle: rgba(0, 0, 0, 0.08);
    --shadow-glow: rgba(0, 221, 128, 0.2);
    --glass-bg: rgba(255, 255, 255, 0.9);
    --input-bg: #F1F5F9;
    --hero-bg: linear-gradient(135deg, #F8FAFC, #E2E8F0);
    --hero-text: #0F172A;
    --hero-subtitle-text: #334155;

    /* Mapeamento para variáveis antigas */
    --primary-color: var(--primary-accent);
    --secondary-color: var(--primary-hover);
    --accent-color: rgba(0, 221, 128, 0.15);
    --surface-color: var(--bg-surface);
    --background-color: var(--bg-canvas);
    
    /* Cores de texto */
    --text-primary: var(--text-main);
    --text-secondary: var(--text-muted);
    --text-light: #64748B;
    
    /* Cores de estado */
    --success-color: #00DD80;
    --error-color: #FF4444;
    --warning-color: #FFB020;
    --info-color: #3399FF;
    
    /* Sombras */
    --shadow-sm: 0 4px 10px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.2);
    
    /* Espaçamentos */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Bordas */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    
    /* Transições */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Tipografia */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
}

body.dark-mode {
    --bg-canvas: #0B0E11;
    --bg-surface: #1A1F25;
    --primary-accent: #00DD80;
    --primary-hover: #00C270;
    --text-main: #FFFFFF;
    --text-muted: #94A3B8;
    --border-subtle: rgba(255, 255, 255, 0.1);
    --shadow-glow: rgba(0, 221, 128, 0.2);
    --glass-bg: rgba(11, 14, 17, 0.8);
    --input-bg: rgba(0, 0, 0, 0.2);
    --hero-bg: linear-gradient(135deg, rgba(11, 14, 17, 0.9), rgba(26, 31, 37, 0.9));
    --hero-text: #FFFFFF;
    --hero-subtitle-text: var(--text-muted);

    --primary-color: var(--primary-accent);
    --secondary-color: var(--primary-hover);
    --accent-color: rgba(0, 221, 128, 0.1);
    --surface-color: var(--bg-surface);
    --background-color: var(--bg-canvas);

    --text-primary: var(--text-main);
    --text-secondary: var(--text-muted);
    --text-light: rgba(255, 255, 255, 0.5);
    
    --shadow-sm: 0 4px 10px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.4);
}

/* ========================================
   BASE STYLES
   ======================================== */

html {
    font-size: clamp(14px, 2.5vw, 18px);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    padding-top: 60px;
    padding-bottom: 70px;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

@media (min-width: 768px) {
    body {
        padding-bottom: 0;
    }
}

/* ========================================
   HEADER FIXO
   ======================================== */

.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background-color: var(--glass-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border-subtle);
    z-index: 1000;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.header-content {
    width: 100%;
    max-width: 1200px;
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header-logo i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.header-logo h1 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

/* Desktop Navigation */
.desktop-nav {
    display: none;
    gap: var(--spacing-sm);
}

@media (min-width: 768px) {
    .desktop-nav {
        display: flex;
    }
}

.desktop-nav .nav-link {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-normal);
}

.desktop-nav .nav-link:hover,
.desktop-nav .nav-link.active {
    background: var(--primary-color);
    color: white;
}

.btn-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: var(--accent-color);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.btn-icon:hover {
    transform: scale(1.1);
    background: var(--primary-color);
    color: white;
}

/* ========================================
   BOTTOM NAVIGATION (MOBILE)
   ======================================== */

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 72px;
    background-color: var(--glass-bg);
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.08);
    z-index: 1000;
    padding-bottom: env(safe-area-inset-bottom, 0);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid var(--border-subtle);
    border-radius: 24px 24px 0 0;
}

@media (min-width: 768px) {
    .bottom-nav {
        display: none;
    }
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.75rem;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    flex: 1;
    height: 100%;
    cursor: pointer;
    background: transparent;
    border: none;
    font-family: inherit;
}

.nav-item i {
    font-size: 1.4rem;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-item.active {
    color: var(--primary-color);
}

.nav-item.active i {
    transform: translateY(-4px) scale(1.15);
    filter: drop-shadow(0 4px 6px var(--shadow-glow));
}

/* ========================================
   MAIN CONTENT
   ======================================== */

.main-content {
    min-height: calc(100vh - 130px);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Hero Section */
.hero-section {
    background: var(--hero-bg);
    color: var(--hero-text);
    padding: 120px 0 80px;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-section h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
}

.hero-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-subtle);
    border-radius: 100px;
    padding: 4px 16px 4px 4px;
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
    color: var(--hero-text);
    backdrop-filter: blur(10px);
}

.hero-badge .badge-pill {
    background: var(--primary-accent);
    color: #000000;
    padding: 4px 12px;
    border-radius: 100px;
    font-weight: 700;
    margin-right: 12px;
    text-transform: uppercase;
    font-size: 11px;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.text-gradient {
    color: var(--primary-accent);
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--hero-subtitle-text);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.6;
    font-weight: 400;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 1.1rem;
}

/* ========================================
   CALCULATOR SECTION
   ======================================== */

.calculator-section {
    padding: var(--spacing-lg) 0;
}

.calculator-card {
    background: var(--surface-color);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-subtle);
}

.card-header {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.card-header h3 {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.card-header p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* ========================================
   FORMS
   ======================================== */

.calculator-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

@media (min-width: 768px) {
    .form-row {
        grid-template-columns: 1fr 1fr;
    }
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.form-group label i {
    color: var(--primary-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: var(--spacing-md);
    border: 1px solid var(--border-subtle);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    background: var(--input-bg);
    color: var(--text-primary);
    transition: all var(--transition-normal);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 221, 128, 0.1);
}

.form-group input:invalid:not(:placeholder-shown),
.form-group select:invalid:not(:placeholder-shown),
.form-group textarea:invalid:not(:placeholder-shown) {
    border-color: var(--error-color);
}

.form-help {
    font-size: var(--font-size-xs);
    color: var(--text-light);
}

.info-box {
    background: var(--accent-color);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.info-box i {
    color: var(--primary-color);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.info-box p {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

/* ========================================
   BUTTONS
   ======================================== */

.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    min-height: 44px;
}

.btn-primary {
    background: var(--primary-color);
    color: #000000;
}

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--shadow-glow);
}

.btn-secondary {
    background: var(--accent-color);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
    background: var(--text-primary);
    color: var(--bg-surface);
}

.btn-success {
    background: var(--success-color);
    color: #000000;
}

.btn-success:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--shadow-glow);
}

.btn-danger {
    background: var(--error-color);
    color: white;
}

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.btn-block {
    width: 100%;
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.form-actions .btn {
    flex: 1;
    min-width: 150px;
}

/* ========================================
   RESULT CONTAINER
   ======================================== */

.result-container {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--input-bg);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--primary-color);
}

.result-container.hidden {
    display: none;
}

.result-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.result-header h4 {
    font-size: var(--font-size-xl);
    color: var(--success-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.result-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

@media (min-width: 768px) {
    .result-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.result-item {
    padding: var(--spacing-md);
    background: var(--surface-color);
    border-radius: var(--border-radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-item.highlight {
    background: rgba(0, 221, 128, 0.1);
    font-weight: 600;
    border: 1px solid rgba(0, 221, 128, 0.3);
}

.result-item.special {
    background: var(--primary-color);
    color: #000000;
}

.result-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.result-item.highlight .result-label,
.result-item.special .result-label {
    color: inherit;
}

.result-value {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--primary-color);
}

.result-item.highlight .result-value {
    color: var(--text-primary);
}

.result-item.special .result-value {
    color: white;
}

.result-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.result-actions .btn {
    flex: 1;
}

/* ========================================
   QUICK CALCULATORS
   ======================================== */

.quick-calculators {
    margin-top: var(--spacing-xl);
}

.quick-calculators h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.calculator-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

@media (min-width: 480px) {
    .calculator-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .calculator-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.calculator-card-link {
    background: var(--surface-color);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-align: center;
    text-decoration: none;
    color: var(--text-primary);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-subtle);
}

.calculator-card-link:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    background: rgba(0, 221, 128, 0.05);
    border-color: var(--primary-accent);
}

.calculator-card-link i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.calculator-card-link h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

.calculator-card-link p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* ========================================
   HISTORY SECTION
   ======================================== */

.history-section {
    margin-top: var(--spacing-xl);
    background: var(--surface-color);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.section-header h3 {
    font-size: var(--font-size-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.history-item {
    background: var(--surface-color);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.history-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 4px;
    background: var(--primary-color);
}

.history-item-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.history-title-group {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.history-item-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.history-item-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.btn-delete-history {
    color: var(--error-color);
    background: rgba(239, 68, 68, 0.1);
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

.btn-delete-history:hover {
    background: var(--error-color);
    color: white;
}

.history-item-details {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.detail-group {
    flex: 1;
    min-width: 110px;
    background: var(--background-color);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-md);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.detail-group.highlight {
    background: rgba(0, 221, 128, 0.05);
    border: 1px solid rgba(0, 221, 128, 0.2);
}

.detail-label {
    font-size: 0.7rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.detail-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.highlight-value {
    color: var(--primary-color);
}

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

.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-light);
    font-style: italic;
}

/* ========================================
   FAQ SECTION
   ======================================== */

.faq-section {
    padding: var(--spacing-xl) 0;
    background: var(--surface-color);
}

.faq-section h2 {
    text-align: center;
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--background-color);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: var(--spacing-lg);
    background: none;
    border: none;
    text-align: left;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all var(--transition-normal);
}

.faq-question:hover {
    background: var(--accent-color);
}

.faq-icon {
    font-size: var(--font-size-xl);
    font-weight: 300;
    color: var(--primary-color);
    transition: transform var(--transition-normal);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.8;
}

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

/* ========================================
   TIPS SECTION
   ======================================== */

.tips-section {
    margin-top: var(--spacing-xl);
}

.tips-section h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.tips-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

@media (min-width: 768px) {
    .tips-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .tips-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.tip-card {
    background: var(--surface-color);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.tip-card i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.tip-card h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

.tip-card p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========================================
   ABOUT PAGE
   ======================================== */

.content-section {
    padding: var(--spacing-xl) 0;
}

.about-card {
    background: var(--surface-color);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

@media (min-width: 768px) {
    .about-card {
        padding: var(--spacing-xl);
        margin-bottom: var(--spacing-lg);
        box-shadow: var(--shadow-md);
    }
}

.about-icon {
    width: 60px;
    height: 60px;
    background: rgba(0, 221, 128, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

@media (min-width: 768px) {
    .about-icon {
        width: 80px;
        height: 80px;
        margin: 0 auto var(--spacing-lg);
    }
}

.about-icon i {
    font-size: 2rem;
    color: var(--primary-color);
}

@media (min-width: 768px) {
    .about-icon i {
        font-size: 2.5rem;
    }
}

.about-card h3 {
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

@media (min-width: 768px) {
    .about-card h3 {
        font-size: var(--font-size-2xl);
        margin-bottom: var(--spacing-lg);
    }
}

.about-card p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

@media (min-width: 768px) {
    .about-card p {
        font-size: var(--font-size-base);
        line-height: 1.8;
    }
}

.about-list {
    list-style: none;
    padding: 0;
}

ul.about-list li {
    padding: var(--spacing-sm) 0;
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    font-size: 0.95rem;
}

ul.about-list i {
    color: var(--success-color);
    margin-top: 4px;
}

ol.about-list {
    padding-left: 1.5rem;
}

ol.about-list li {
    display: list-item;
    list-style-type: decimal;
    padding: var(--spacing-xs) 0;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

@media (min-width: 768px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.feature-item {
    background: var(--surface-color);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-align: center;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.feature-item i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.feature-item h4 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
}

.feature-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.highlight-card {
    background: linear-gradient(135deg, var(--primary-color), #00b366);
    color: white;
    border: none;
}

.highlight-card .about-icon {
    background: rgba(255, 255, 255, 0.2);
}

.highlight-card .about-icon i {
    color: white;
}

.highlight-card h3,
.highlight-card p {
    color: white;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

.cta-buttons .btn {
    width: 100%;
}

@media (min-width: 768px) {
    .cta-buttons .btn {
        width: auto;
    }
}



/* ========================================
   CONTACT PAGE
   ======================================== */

.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

@media (min-width: 1024px) {
    .contact-grid {
        grid-template-columns: 2fr 1fr;
    }
}

.contact-card {
    background: var(--surface-color);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.contact-icon i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.contact-card h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

.contact-card p {
    color: var(--text-secondary);
}

.contact-card a {
    color: var(--primary-color);
    text-decoration: none;
}

.contact-card a:hover {
    text-decoration: underline;
}

.social-links {
    background: var(--surface-color);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-align: center;
}

.social-links h4 {
    margin-bottom: var(--spacing-md);
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.social-icons a {
    width: 50px;
    height: 50px;
    background: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 1.5rem;
    transition: all var(--transition-normal);
}

.social-icons a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-4px);
}

.success-message {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--success-color);
    color: white;
    border-radius: var(--border-radius-lg);
}

.success-message.hidden {
    display: none;
}

.success-message i {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.success-message h4 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.faq-mini {
    margin-top: var(--spacing-xl);
    background: var(--surface-color);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
}

.faq-mini h3 {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.faq-mini-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

@media (min-width: 768px) {
    .faq-mini-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.faq-mini-item {
    background: var(--background-color);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
}

.faq-mini-item h4 {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.faq-mini-item p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* ========================================
   FOOTER
   ======================================== */

.app-footer {
    background: var(--surface-color);
    padding: calc(var(--spacing-xl) * 1.2) 0 calc(var(--spacing-xl) * 1.5);
    text-align: center;
    margin-top: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.app-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    opacity: 0.5;
}

.app-footer p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.b20-link {
    color: var(--primary-color);
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.b20-link::after {
    content: '\f08e';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 0.75rem;
    opacity: 0.7;
}

.b20-link:hover {
    text-decoration: none;
    color: var(--secondary-color);
    transform: translateY(-2px);
}

.footer-links {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
    flex-wrap: wrap;
    background: var(--background-color);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 30px;
    border: 1px solid var(--border-subtle);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-links .separator {
    color: var(--border-subtle);
    font-size: 0.85rem;
}

/* ========================================
   TOAST NOTIFICATION
   ======================================== */

.toast {
    position: fixed;
    bottom: 90px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 10000;
    opacity: 0;
    transition: all var(--transition-normal);
    max-width: 90%;
    text-align: center;
}

@media (min-width: 768px) {
    .toast {
        bottom: var(--spacing-lg);
    }
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.success {
    background: var(--success-color);
}

.toast.error {
    background: var(--error-color);
}

.toast.warning {
    background: var(--warning-color);
}

.toast.info {
    background: var(--info-color);
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

/* ========================================
   ANIMATIONS
   ======================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn var(--transition-normal);
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

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

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
    .app-header,
    .bottom-nav,
    .app-footer,
    .form-actions,
    .btn {
        display: none;
    }
    
    body {
        padding: 0;
    }
    
    .result-container {
        border: 2px solid #000;
    }
}

/* ========================================
   DROPDOWN MENU
   ======================================== */
.dropdown { position: relative; display: inline-block; height: 100%; }
.dropbtn { background: transparent; color: inherit; font-weight: inherit; border: none; font-family: inherit; font-size: 1rem; cursor: pointer; display: flex; align-items: center; gap: 6px; padding: var(--spacing-sm) var(--spacing-md); }
.dropdown-content { display: none; position: absolute; top: 100%; left: 0; background-color: var(--surface-color); min-width: 220px; box-shadow: var(--shadow-lg); border-radius: var(--border-radius-md); z-index: 1100; border: 1px solid var(--border-subtle); overflow: hidden; margin-top: 0px; padding: 8px 0; }
.dropdown:hover .dropdown-content, .dropdown:focus-within .dropdown-content { display: block; animation: fadeIn 0.2s ease; }
.dropdown-content a { color: var(--text-primary); padding: 12px 16px; text-decoration: none; display: flex; align-items: center; gap: 10px; font-size: 0.95rem; transition: background var(--transition-fast); border-bottom: 1px solid var(--border-subtle); }
.dropdown-content a:last-child { border-bottom: none; }
.dropdown-content a:hover { background-color: var(--accent-color); color: var(--primary-color); }
.dropdown-content a i { width: 20px; text-align: center; color: var(--primary-color); }