/* ==========================================================================
   Messer-Tech Website Stylesheet - Updated 2025
   ========================================================================== */

/* 1. DESIGN TOKENS (CSS Custom Properties) */
:root {
    --color-primary: #00B4B4;
    --color-primary-hover: #009999;
    --color-primary-light: rgba(0, 180, 180, 0.1);
    --color-text: #2D3748;
    --color-text-muted: #718096;
    --color-text-inverse: #FFFFFF;
    --color-bg: #F7F8FA;
    --color-surface: #FFFFFF;
    --color-border: #E2E8F0;
    --color-footer-bg: #2D3748;
    --color-footer-text: #A0AEC0;
    --color-footer-heading: #FFFFFF;
    --space-xs: 0.25rem; --space-sm: 0.5rem; --space-md: 1rem;
    --space-lg: 1.5rem; --space-xl: 2rem; --space-2xl: 3rem; --space-3xl: 4rem;
    --radius-sm: 4px; --radius-md: 8px; --radius-lg: 12px;
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --font-family: 'Inter', sans-serif;
    --font-size-base: 1rem; --font-size-lg: 1.125rem; --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem; --font-size-3xl: 1.875rem; --font-size-4xl: 2.25rem;
    --font-weight-bold: 700; --line-height-normal: 1.5; --line-height-relaxed: 1.75;
    --transition-base: 200ms ease; --transition-fast: 150ms ease;
}

/* 2. BASE / RESET STYLES */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: var(--font-family); color: var(--color-text); background-color: var(--color-bg); }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-primary-hover); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* 3. TYPOGRAPHY */
h1, h2, h3, h4 { font-weight: var(--font-weight-bold); line-height: 1.25; margin-bottom: var(--space-sm); }
h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
p { margin-bottom: var(--space-md); color: var(--color-text-muted); }

/* 4. LAYOUT UTILITIES */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 var(--space-md); }
.section { padding: var(--space-3xl) 0; }
.section-header { text-align: center; margin-bottom: var(--space-2xl); }
.grid { display: grid; gap: var(--space-lg); }
.grid-3, .grid-4 { grid-template-columns: 1fr; }

@media (min-width: 768px) {
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* 5. NAVIGATION */
.navbar { background: var(--color-surface); border-bottom: 1px solid var(--color-border); padding: 0.7rem var(--space-lg); position: sticky; top: 0; z-index: 1000; }
.navbar-inner { display: flex; justify-content: space-between; align-items: center; max-width: 1200px; margin: 0 auto; }
.navbar-logo img { height: 80px; width: auto; }
.navbar-links { display: none; gap: var(--space-xl); align-items: center; }
.mobile-toggle { display: flex; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; }
.mobile-toggle span { width: 28px; height: 2px; background-color: var(--color-text); }
.mobile-menu { display: none; background: var(--color-surface); flex-direction: column; padding: var(--space-md); }
.mobile-menu.active { display: flex; }
@media (min-width: 768px) { .navbar-links { display: flex; } .mobile-toggle { display: none; } }

/* 6. BUTTONS */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: var(--space-sm) var(--space-lg); border-radius: var(--radius-md); font-weight: 600; cursor: pointer; transition: all var(--transition-fast); }
.btn-primary { background: var(--color-primary); color: white; border: none; }
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-secondary { border: 2px solid var(--color-primary); color: var(--color-primary); }
.btn-secondary:hover { background: var(--color-primary); color: white; }
.btn-lg { padding: var(--space-md) var(--space-xl); font-size: var(--font-size-base); }

/* 8. CARDS (UPDATED FOR EQUAL HEIGHT) */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    transition: all var(--transition-base);
    position: relative;
    display: flex;             /* Added */
    flex-direction: column;    /* Added */
    height: 100%;              /* Added */
}
.card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--color-primary); }
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: var(--color-primary); }
.card-icon { width: 56px; height: 56px; display: flex; align-items: center; justify-content: center; background: var(--color-primary-light); color: var(--color-primary); border-radius: var(--radius-md); font-size: var(--font-size-2xl); margin-bottom: var(--space-md); }
.card-description { flex-grow: 1; font-size: var(--font-size-sm); line-height: var(--line-height-relaxed); }

/* 9. HERO */
.hero { padding: var(--space-3xl) 0; text-align: center; background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-bg) 100%); }
.hero h1 { font-size: var(--font-size-4xl); margin-bottom: var(--space-md); }
.hero p { max-width: 600px; margin: 0 auto var(--space-xl); font-size: var(--font-size-lg); }
.hero-actions { display: flex; gap: var(--space-md); justify-content: center; flex-wrap: wrap; }

/* 10. SECTORS */
.sector-card { text-align: center; }
.sector-card .card-icon { margin-left: auto; margin-right: auto; }

/* 11. CONTACT */
.contact-grid { display: grid; gap: var(--space-2xl); }
@media (min-width: 768px) { .contact-grid { grid-template-columns: 1fr 1.5fr; } }
.contact-form { background: var(--color-bg); padding: var(--space-xl); border-radius: var(--radius-lg); }
.form-group { margin-bottom: var(--space-md); }
.form-input, .form-textarea { width: 100%; padding: var(--space-sm); border-radius: var(--radius-sm); border: 1px solid var(--color-border); }

/* 12. FOOTER */
.footer { background: var(--color-footer-bg); color: var(--color-footer-text); padding: var(--space-3xl) 0 var(--space-xl); }
.footer-inner { display: grid; gap: var(--space-xl); grid-template-columns: 1fr; }
@media (min-width: 768px) { .footer-inner { grid-template-columns: 1.2fr 1fr 1fr; } }
.footer-logo img { height: 50px; filter: brightness(0) invert(1); }
.bg-alt { background-color: var(--color-surface); }