/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Modern Color Palette */
    --primary-color: #1A365D;        /* Deep navy blue - brand color */
    --secondary-color: #3182CE;      /* Bright blue - accents */
    --accent-color: #00B5AD;         /* Teal - CTAs */
    --text-color: #2D3748;           /* Dark gray - body text */
    --text-muted: #718096;           /* Muted gray - secondary text */
    --bg-color: #F7FAFC;             /* Soft gray background */
    --bg-white: #FFFFFF;             /* Pure white for cards */
    --light-bg: #EDF2F7;             /* Light gray background */
    --border-color: #E2E8F0;         /* Subtle borders */
    
    /* Spacing - Improved Scale */
    --spacing-xs: 0.5rem;            /* 8px */
    --spacing-sm: 1rem;              /* 16px */
    --spacing-md: 1.5rem;            /* 24px */
    --spacing-lg: 2rem;              /* 32px */
    --spacing-xl: 3rem;              /* 48px */
    --spacing-2xl: 4rem;             /* 64px */
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 8px 24px rgba(0, 0, 0, 0.12);
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
    padding-top: 70px;
    font-weight: var(--font-weight-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

#app {
    flex: 1;
}

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Typography */
h1 {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
    line-height: 1.3;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
    line-height: 1.4;
}

h4 {
    font-size: 1.25rem;
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-xs);
    color: var(--text-color);
}

p {
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
    color: var(--text-color);
}

/* Links */
a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    background: linear-gradient(135deg, var(--secondary-color) 0%, #2B6CB0 100%);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-md);
    letter-spacing: 0.015em;
}

.btn:hover:not(:disabled) {
    background: linear-gradient(135deg, #2B6CB0 0%, var(--secondary-color) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn:focus-visible {
    outline: 3px solid rgba(49, 130, 206, 0.4);
    outline-offset: 2px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

/* Loading State */
.loading {
    text-align: center;
    padding: var(--spacing-lg);
    font-size: 1.2rem;
    color: var(--secondary-color);
}

/* Error State */
.error {
    background-color: #fee;
    border: 1px solid #fcc;
    color: #c33;
    padding: var(--spacing-sm);
    border-radius: 4px;
    margin: var(--spacing-sm) 0;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }

/* Service Pages */
.service-description {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    color: #555;
}

.service-list {
    list-style: none;
    padding: 0;
    margin: var(--spacing-md) 0;
}

.service-list li {
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    background-color: var(--light-bg);
    border-left: 4px solid var(--primary-color);
    transition: transform 0.2s;
}

.service-list li:hover {
    transform: translateX(5px);
}

.cta-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-md);
    border-radius: 8px;
    margin-top: var(--spacing-lg);
    text-align: center;
}

.cta-section p {
    margin: var(--spacing-xs) 0;
    font-size: 1.1rem;
}

.emergency-notice {
    background: linear-gradient(135deg, #d32f2f, #f44336);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(211, 47, 47, 0.7);
    }
    50% {
        box-shadow: 0 0 0 10px rgba(211, 47, 47, 0);
    }
}

/* =============================================
   Ventilation Page
   ============================================= */

/* Hero */
.vent-hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1e4080 55%, #15527a 100%);
    padding: 1.5rem 0 2.25rem;
    position: relative;
    overflow: hidden;
}

.vent-hero::before {
    content: '';
    position: absolute;
    right: -120px;
    top: -120px;
    width: 480px;
    height: 480px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.035);
    pointer-events: none;
}

.vent-hero::after {
    content: '';
    position: absolute;
    right: 60px;
    top: 30px;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.04);
    pointer-events: none;
}

.vent-eyebrow {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent-color);
    margin-bottom: 0.6rem;
}

.vent-hero-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    color: #fff;
    margin-bottom: var(--spacing-sm);
    line-height: 1.18;
    letter-spacing: -0.02em;
}

.vent-hero-lead {
    font-size: 1.1rem;
    line-height: 1.72;
    color: rgba(255, 255, 255, 0.76);
}

/* Sections */
.vent-section {
    padding: var(--spacing-xl) 0;
}

.vent-section--alt {
    background: var(--light-bg);
}

.vent-section-heading {
    font-size: 1.55rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    line-height: 1.25;
}

.vent-section-heading--center {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.vent-section-lead {
    font-size: 0.975rem;
    color: var(--text-muted);
    line-height: 1.72;
    margin-bottom: var(--spacing-lg);
}

/* Offer grid — 4 cards */
.vent-offer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
}

.vent-offer-card {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    transition: box-shadow 0.22s ease, transform 0.22s ease;
}

.vent-offer-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}

.vent-offer-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(49, 130, 206, 0.1), rgba(0, 181, 173, 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
    color: var(--secondary-color);
    flex-shrink: 0;
}

.vent-offer-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.45rem;
    line-height: 1.3;
}

.vent-offer-desc {
    font-size: 0.875rem;
    line-height: 1.62;
    color: var(--text-muted);
}

/* Split grid: for whom + why */
.vent-split-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

/* For-whom list */
.vent-for-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.vent-for-item {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    font-size: 0.975rem;
    color: var(--text-color);
    line-height: 1.5;
}

.vent-check-icon {
    flex-shrink: 0;
    margin-top: 2px;
    color: var(--accent-color);
}

/* Why text */
.vent-why-text {
    font-size: 0.975rem;
    line-height: 1.78;
    color: #4a5568;
}

/* Process steps — 5-column grid */
.vent-steps {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-sm);
}

.vent-step {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    transition: box-shadow 0.2s ease;
}

.vent-step:hover {
    box-shadow: var(--shadow-md);
}

.vent-step-num {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    font-weight: 800;
    flex-shrink: 0;
}

.vent-step-title {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1.3;
    margin: 0;
}

.vent-step-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.55;
    margin: 0;
}

/* CTA section */
.vent-cta-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-white);
}

.vent-cta-inner {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
}

.vent-cta-title {
    font-size: 1.75rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 0.6rem;
    line-height: 1.2;
}

.vent-cta-text {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.65;
    max-width: 540px;
    margin: 0 auto var(--spacing-md);
}

.vent-cta-btn {
    display: inline-block;
    background: var(--accent-color);
    color: #fff;
    padding: 0.85rem 2.4rem;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 700;
    text-decoration: none;
    letter-spacing: 0.02em;
    transition: background 0.18s ease, transform 0.15s ease;
}

.vent-cta-btn:hover {
    background: #009B94;
    transform: translateY(-1px);
}

/* VRV page gets a distinct teal-to-navy gradient */
.vrv-hero {
    background: linear-gradient(135deg, #0f4c75 0%, #1b6ca8 55%, #0a7ea4 100%);
}

/* Responsive */
@media (max-width: 960px) {
    .vent-offer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .vent-steps {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 640px) {
    .vent-hero {
        padding: var(--spacing-lg) 0 var(--spacing-xl);
    }

    .vent-offer-grid {
        grid-template-columns: 1fr;
    }

    .vent-split-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .vent-steps {
        grid-template-columns: 1fr;
    }

    .vent-cta-inner {
        padding: var(--spacing-lg) var(--spacing-sm);
    }

    .vent-cta-title {
        font-size: 1.4rem;
    }
}