/* Perpedes — Open Hardware Lab for Sustainable Living */
/* CSS Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
    --color-primary: #2d6a4f;
    --color-primary-dark: #1b4d3a;
    --color-primary-light: #40916c;
    --color-secondary: #52796f;
    --color-accent: #d4a843;
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-text: #1a1a2e;
    --color-text-muted: #6b7280;
    --color-border: #e5e7eb;
    --color-error: #dc2626;
    --color-success: #16a34a;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --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-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --transition: 0.2s ease;
    --container-max: 1200px;
    --header-height: 72px;
}
html { scroll-behavior: smooth; }
body { font-family: var(--font-sans); font-size: 1rem; line-height: 1.6; color: var(--color-text); background: var(--color-bg); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); }
ul { list-style: none; }
h1, h2, h3, h4 { line-height: 1.2; font-weight: 700; color: var(--color-text); }
h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.5rem); }
.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-lg); }
.section { padding: var(--space-3xl) 0; }
.section-title { text-align: center; margin-bottom: var(--space-sm); }
.section-subtext { text-align: center; color: var(--color-text-muted); max-width: 600px; margin: 0 auto var(--space-2xl); }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-sm); padding: 0.75rem 1.5rem; font-size: 0.9375rem; font-weight: 600; border-radius: var(--radius-md); border: 2px solid transparent; cursor: pointer; transition: all var(--transition); text-decoration: none; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }
.btn-primary { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.btn-primary:hover:not(:disabled) { background: var(--color-primary-dark); border-color: var(--color-primary-dark); }
.btn-secondary { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn-secondary:hover:not(:disabled) { background: var(--color-primary); color: #fff; }
.btn-outline { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn-outline:hover:not(:disabled) { background: var(--color-primary); color: #fff; }

/* Header */
.header { position: fixed; top: 0; left: 0; right: 0; height: var(--header-height); background: rgba(255,255,255,0.95); backdrop-filter: blur(8px); border-bottom: 1px solid var(--color-border); z-index: 1000; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.logo { font-size: 1.5rem; font-weight: 700; color: var(--color-primary); letter-spacing: -0.02em; }
.nav { display: flex; align-items: center; gap: var(--space-md); }
.nav-link { padding: var(--space-sm) var(--space-md); font-weight: 500; color: var(--color-text); border-radius: var(--radius-sm); transition: all var(--transition); }
.nav-link:hover { color: var(--color-primary); background: rgba(45,106,79,0.08); }
.nav-cta { background: var(--color-primary); color: #fff; }
.nav-cta:hover { background: var(--color-primary-dark); color: #fff; }
.nav-toggle { display: none; background: none; border: none; padding: var(--space-sm); cursor: pointer; }
.nav-toggle-icon { display: block; color: var(--color-text); }

/* Hero */
.hero { min-height: 100vh; display: flex; align-items: center; padding-top: var(--header-height); background: linear-gradient(180deg, rgba(45,106,79,0.03) 0%, transparent 100%); }
.hero-content { max-width: 800px; margin: 0 auto; text-align: center; }
.hero-subtext { font-size: 1.25rem; color: var(--color-text-muted); margin-bottom: var(--space-xl); max-width: none; }
.hero-buttons { display: flex; gap: var(--space-md); justify-content: center; flex-wrap: wrap; }

/* Projects */
.projects { background: var(--color-surface); }
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--space-xl); }
.project-card { padding: var(--space-xl); background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-lg); transition: all var(--transition); text-align: center; }
.project-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--color-primary); }
.project-icon { display: inline-flex; align-items: center; justify-content: center; width: 64px; height: 64px; margin-bottom: var(--space-md); background: rgba(45,106,79,0.1); border-radius: var(--radius-md); color: var(--color-primary); }
.project-card h3 { margin-bottom: var(--space-xs); }
.project-subtitle { font-size: 0.875rem; color: var(--color-primary); font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: var(--space-sm); display: block; }
.project-card > p { color: var(--color-text-muted); margin-bottom: var(--space-md); }
.project-features { display: flex; flex-wrap: wrap; gap: var(--space-sm); justify-content: center; margin-bottom: var(--space-lg); }
.project-features li { font-size: 0.8125rem; padding: var(--space-xs) var(--space-sm); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-sm); color: var(--color-text); }

/* Mission */
.mission { background: var(--color-surface); }
.mission-content { max-width: 800px; margin: 0 auto; text-align: center; }
.mission-content > p { margin-bottom: var(--space-lg); color: var(--color-text-muted); }
.pillars { display: flex; flex-wrap: wrap; gap: var(--space-sm); justify-content: center; margin-top: var(--space-xl); }
.pillar { padding: var(--space-sm) var(--space-lg); background: rgba(45,106,79,0.1); color: var(--color-primary); border-radius: 9999px; font-weight: 600; font-size: 0.875rem; }

/* Contact Form */
.contact { background: var(--color-bg); }
.contact-form { max-width: 640px; margin: 0 auto; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-md); }
.form-group { margin-bottom: var(--space-lg); }
.form-group label { display: block; font-weight: 500; margin-bottom: var(--space-xs); color: var(--color-text); }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 0.75rem 1rem; font-family: inherit; font-size: 1rem; border: 2px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-surface); color: var(--color-text); transition: border-color var(--transition), box-shadow var(--transition); }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(45,106,79,0.15); }
.form-group input[aria-invalid="true"], .form-group select[aria-invalid="true"], .form-group textarea[aria-invalid="true"] { border-color: var(--color-error); }
.form-help { display: block; font-size: 0.8125rem; color: var(--color-text-muted); margin-top: var(--space-xs); }
.checkbox-group { display: flex; align-items: flex-start; gap: var(--space-sm); }
.checkbox-group input[type="checkbox"] { width: auto; margin-top: 0.25rem; }
.checkbox-group label { font-weight: 400; font-size: 0.875rem; cursor: pointer; }
.btn-submit { width: 100%; padding: 1rem; font-size: 1rem; margin-top: var(--space-sm); }
.form-status { margin-top: var(--space-md); padding: var(--space-md); border-radius: var(--radius-md); font-weight: 500; display: none; }
.form-status.success { display: block; background: rgba(22,163,74,0.1); color: var(--color-success); border: 1px solid var(--color-success); }
.form-status.error { display: block; background: rgba(220,38,38,0.1); color: var(--color-error); border: 1px solid var(--color-error); }

/* About */
.about { background: var(--color-surface); }
.about-content { max-width: 800px; margin: 0 auto; text-align: center; }
.about-content > p { margin-bottom: var(--space-lg); color: var(--color-text-muted); }
.about-content h3 { margin: var(--space-xl) 0 var(--space-md); text-align: left; }
.principles-list { text-align: left; max-width: 600px; margin: 0 auto; }
.principles-list li { margin-bottom: var(--space-md); padding-left: var(--space-lg); position: relative; color: var(--color-text-muted); }
.principles-list li::before { content: "✓"; position: absolute; left: 0; color: var(--color-primary); font-weight: 700; }

/* Footer */
.footer { background: var(--color-text); color: #fff; padding: var(--space-3xl) 0 var(--space-xl); }
.footer-grid { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: var(--space-2xl); margin-bottom: var(--space-2xl); }
.footer h3 { color: #fff; margin-bottom: var(--space-md); font-size: 1.25rem; }
.footer h4 { color: #fff; margin-bottom: var(--space-md); font-size: 1rem; }
.footer p { color: rgba(255,255,255,0.7); margin-bottom: var(--space-md); }
.footer ul li { margin-bottom: var(--space-sm); }
.footer a { color: rgba(255,255,255,0.7); }
.footer a:hover { color: var(--color-accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: var(--space-xl); display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: var(--space-md); }
.footer-bottom p { color: rgba(255,255,255,0.5); font-size: 0.875rem; margin: 0; }
.made-with { color: rgba(255,255,255,0.4); font-size: 0.75rem; }

/* Site Banner */
.site-banner { width: 100%; overflow: hidden; padding-top: var(--header-height); }
.site-banner img { width: 100%; height: auto; display: block; }

/* Mobile */
@media (max-width: 768px) {
    .nav-toggle { display: block; }
    .nav { position: fixed; top: var(--header-height); left: 0; right: 0; background: var(--color-surface); flex-direction: column; padding: var(--space-lg); gap: var(--space-xs); border-bottom: 1px solid var(--color-border); transform: translateY(-100%); opacity: 0; visibility: hidden; transition: all 0.3s ease; }
    .nav.is-open { transform: translateY(0); opacity: 1; visibility: visible; }
    .nav-link { width: 100%; text-align: center; padding: var(--space-md); }
    .form-row { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: var(--space-xl); text-align: center; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .principles-list { text-align: center; }
    .principles-list li { text-align: left; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}