/**
 * EZ Virtual Tools - Plumbing Calculator Suite
 * Dark theme with emerald accent (#10b981)
 */

:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #10b981;
    --accent-hover: #059669;
    --accent-light: rgba(16, 185, 129, 0.1);
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #0ea5e9;
    --border: #334155;
    --shadow: rgba(0, 0, 0, 0.3);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Navigation */
.nav {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-brand span {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.2s;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.page-container {
    padding-top: 1.5rem;
    padding-bottom: 3rem;
}

/* Breadcrumb */
.breadcrumb {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.breadcrumb a {
    color: var(--text-secondary);
    text-decoration: none;
}

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

.breadcrumb-separator {
    margin: 0 0.5rem;
}

/* Grid */
.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

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

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* Cards */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
}

.card-header {
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.card-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Calculator Cards */
.calc-card {
    display: block;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.25rem;
    text-decoration: none;
    transition: all 0.2s;
}

.calc-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.calc-card h3 {
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.calc-card p {
    color: var(--text-secondary);
    font-size: 0.8rem;
    line-height: 1.5;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.375rem;
}

.form-input,
.form-select {
    width: 100%;
    padding: 0.625rem 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: border-color 0.2s;
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--accent);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.form-input::-webkit-outer-spin-button,
.form-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    font-size: 0.9rem;
    font-weight: 500;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

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

.btn-secondary:hover {
    border-color: var(--accent);
}

.btn-block {
    width: 100%;
}

.btn-lg {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
}

/* Results */
.result-box {
    background: var(--bg-tertiary);
    border-radius: 0.5rem;
    padding: 1rem;
}

.result-highlight {
    background: var(--accent-light);
    border: 1px solid var(--accent);
}

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

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
}

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

.result-label {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.result-value {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.95rem;
}

/* Tables */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
}

th, td {
    padding: 0.625rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.75rem;
    text-transform: uppercase;
}

td.highlight {
    color: var(--accent);
    font-weight: 600;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 0.5rem;
    font-size: 0.85rem;
}

.alert-success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid var(--success);
    color: var(--success);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid var(--warning);
    color: var(--warning);
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error);
    color: var(--error);
}

.alert-info {
    background: rgba(14, 165, 233, 0.1);
    border: 1px solid var(--info);
    color: var(--info);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    border-radius: 0.375rem;
    transition: all 0.2s;
}

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

.tab-btn.active {
    background: var(--accent);
    color: white;
}

.tab-content {
    display: none;
}

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

/* Hero Section */
.hero {
    text-align: center;
    padding: 3rem 0;
}

.hero h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.hero h1 span {
    color: var(--accent);
}

.hero p {
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
}

.hero-stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent);
}

.hero-stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Section Headers */
.section {
    margin-top: 2.5rem;
}

.section-header {
    margin-bottom: 1.25rem;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.section-description {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 1.5rem;
    text-align: center;
    margin-top: 3rem;
}

.footer p {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.footer a {
    color: var(--accent);
    text-decoration: none;
}

/* Utilities */
.text-accent { color: var(--accent); }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-error { color: var(--error); }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }

/* Responsive */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: 1rem;
        gap: 0.75rem;
        border-bottom: 1px solid var(--border);
    }

    .nav-links.open {
        display: flex;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .hero-stats {
        gap: 1.5rem;
    }

    .hero-stat-value {
        font-size: 1.25rem;
    }

    .tabs {
        overflow-x: auto;
        flex-wrap: nowrap;
    }
}

@media (max-width: 480px) {
    .card {
        padding: 1rem;
    }

    .result-highlight .result-value {
        font-size: 1.25rem;
    }
}

/* ============================================================
   UNIFIED FOOTER STYLES
   ============================================================ */
.footer {
    background: var(--bg-secondary, #12121a);
    border-top: 1px solid var(--border, #2a2a35);
    padding: 2rem 1rem;
    margin-top: 3rem;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-brand {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary, #f0f0f5);
}

.footer-brand span {
    color: var(--accent, #10b981);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem 1rem;
    margin-bottom: 1.5rem;
}

.footer-link {
    color: var(--text-secondary, #a0a0b0);
    text-decoration: none;
    font-size: 0.875rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    transition: all 0.2s;
}

.footer-link:hover {
    color: var(--accent, #10b981);
    background: rgba(16, 185, 129, 0.1);
}

.footer-link.active {
    color: var(--accent, #10b981);
    font-weight: 500;
}

.footer-copy {
    color: var(--text-muted, #6b6b7b);
    font-size: 0.8rem;
}

.footer-copy a {
    color: var(--accent, #10b981);
    text-decoration: none;
}

.footer-disclaimer {
    max-width: 800px;
    margin: 0 auto 1.5rem;
    padding: 1rem;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: 8px;
    font-size: 0.8rem;
    color: var(--text-secondary, #a0a0b0);
}