/* ImpactLex styles — brand-aligned with ImpactMojo V3 design system. */

:root {
    --primary-bg: #F8FAFC;
    --secondary-bg: #FFFFFF;
    --accent-color: #0284C7;
    --accent-hover: #0369A1;
    --secondary-accent: #6366F1;
    --success-color: #10B981;
    --warning-color: #F59E0B;
    --danger-color: #EF4444;
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #64748B;
    --card-bg: #FFFFFF;
    --hover-bg: #F1F5F9;
    --border-color: #E2E8F0;
    --nav-bg: rgba(248, 250, 252, 0.95);
    --nav-text: #0F172A;
    --gradient-primary: linear-gradient(135deg, #0284C7 0%, #4338CA 100%);
    --gradient-accent: linear-gradient(135deg, #0EA5E9 0%, #10B981 100%);
    --gradient-hero: linear-gradient(180deg, rgba(14, 165, 233, 0.08) 0%, transparent 50%);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] {
    --primary-bg: #0F172A;
    --secondary-bg: #1E293B;
    --accent-color: #0EA5E9;
    --accent-hover: #0284C7;
    --text-primary: #F1F5F9;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;
    --card-bg: #1E293B;
    --hover-bg: #334155;
    --border-color: #334155;
    --nav-bg: rgba(15, 23, 42, 0.95);
    --nav-text: #F1F5F9;
    --gradient-primary: linear-gradient(135deg, #0369A1 0%, #4338CA 100%);
    --gradient-hero: linear-gradient(180deg, rgba(14, 165, 233, 0.1) 0%, transparent 50%);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.5);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Amaranth', sans-serif;
    background: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-top: 72px;
}
a { color: var(--accent-color); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--accent-hover); }
h1, h2, h3, h4, h5, h6 { font-family: 'Inter', sans-serif; font-weight: 700; line-height: 1.3; }

.skip-link {
    position: absolute; top: -40px; left: 0;
    background: var(--accent-color); color: white;
    padding: 8px 16px; z-index: 10000; border-radius: 0 0 8px 0;
}
.skip-link:focus { top: 0; }

/* Paper plane decoration */
.v3-paper-plane {
    position: fixed; top: 15%; right: 8%;
    width: 140px; height: 140px;
    opacity: 0.18; z-index: 0; pointer-events: none;
    animation: v3-float-plane 25s ease-in-out infinite;
}
@keyframes v3-float-plane {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(-40px, 30px) rotate(8deg); }
    50% { transform: translate(60px, 20px) rotate(-5deg); }
    75% { transform: translate(20px, 50px) rotate(12deg); }
}
@media (max-width: 768px) { .v3-paper-plane { width: 90px; height: 90px; opacity: 0.12; } }
@media (prefers-reduced-motion: reduce) { .v3-paper-plane { animation: none; } }

/* Header */
.header {
    position: fixed; top: 0; left: 0; right: 0;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}
.nav-container {
    max-width: 1400px; margin: 0 auto;
    padding: 0.75rem 1.5rem;
    display: flex; align-items: center; justify-content: space-between; gap: 1.5rem;
}
.logo-container { display: flex; align-items: center; gap: 0.75rem; text-decoration: none; }
.logo-container img { width: 44px; height: 44px; border-radius: 10px; object-fit: contain; }
.logo-text { display: flex; flex-direction: column; }
.logo-main { font-family: 'Inter', sans-serif; font-size: 1.25rem; font-weight: 700; color: var(--text-primary); line-height: 1.15; }
.logo-tagline { font-size: 0.7rem; color: var(--accent-color); font-weight: 500; letter-spacing: 0.5px; }
.nav-buttons { display: flex; align-items: center; gap: 0.5rem; }
.nav-link {
    padding: 0.55rem 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: 8px;
    transition: all 0.2s ease;
}
.nav-link:hover { background: var(--hover-bg); color: var(--accent-color); }
@media (max-width: 640px) { .nav-link { display: none; } .logo-tagline { display: none; } }

.theme-toggle {
    width: 40px; height: 40px; border-radius: 10px;
    background: var(--card-bg); border: 1px solid var(--border-color);
    cursor: pointer; display: flex; align-items: center; justify-content: center;
    transition: all 0.2s ease; padding: 0;
}
.theme-toggle:hover { background: var(--hover-bg); border-color: var(--accent-color); }
.theme-toggle svg { width: 18px; height: 18px; stroke: var(--text-primary); fill: none; stroke-width: 2; }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* Hero */
.page-hero {
    padding: 3rem 1.5rem 2rem;
    text-align: center;
    background: var(--gradient-hero);
    position: relative;
    z-index: 1;
}
.page-hero h1 {
    font-size: 2.25rem;
    margin-bottom: 0.75rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.page-hero p { font-size: 1.05rem; color: var(--text-secondary); max-width: 640px; margin: 0 auto; }
.hero-stats { display: flex; justify-content: center; gap: 1.5rem; margin-top: 1.25rem; flex-wrap: wrap; }
.hero-stat { display: flex; flex-direction: column; align-items: center; }
.hero-stat-value { font-family: 'Inter', sans-serif; font-weight: 700; color: var(--accent-color); font-size: 1.5rem; }
.hero-stat-label { font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }
@media (max-width: 640px) {
    .page-hero h1 { font-size: 1.65rem; }
    .page-hero p { font-size: 0.95rem; }
}

/* Main content */
main { flex: 1; position: relative; z-index: 1; }
.container { max-width: 1200px; margin: 0 auto; padding: 2rem 1.5rem 4rem; }

/* Search bar */
.search-bar {
    position: sticky; top: 72px; z-index: 50;
    background: var(--primary-bg);
    padding: 0.75rem 0;
    margin-bottom: 1rem;
}
.search-input-wrap {
    position: relative;
    max-width: 720px;
    margin: 0 auto;
}
.search-input {
    width: 100%;
    padding: 0.95rem 1.25rem 0.95rem 3rem;
    font-family: 'Amaranth', sans-serif;
    font-size: 1rem;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 14px;
    color: var(--text-primary);
    transition: all 0.2s ease;
    outline: none;
}
.search-input:focus { border-color: var(--accent-color); box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.1); }
.search-icon {
    position: absolute; left: 1rem; top: 50%;
    transform: translateY(-50%);
    width: 20px; height: 20px;
    stroke: var(--text-muted); fill: none; stroke-width: 2;
    pointer-events: none;
}
.search-clear {
    position: absolute; right: 0.75rem; top: 50%;
    transform: translateY(-50%);
    width: 28px; height: 28px; border-radius: 50%;
    background: var(--hover-bg); border: none; cursor: pointer;
    display: none; align-items: center; justify-content: center;
}
.search-clear.visible { display: flex; }
.search-clear svg { width: 14px; height: 14px; stroke: var(--text-secondary); fill: none; stroke-width: 2; }

/* Filter chips */
.filters {
    max-width: 1000px; margin: 0 auto 1.5rem;
    display: flex; flex-wrap: wrap; gap: 0.5rem;
    justify-content: center;
}
.filter-group {
    display: flex; flex-wrap: wrap; gap: 0.4rem;
    padding: 0.4rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
}
.filter-chip {
    padding: 0.4rem 0.85rem;
    font-family: 'Amaranth', sans-serif;
    font-size: 0.85rem;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
}
.filter-chip:hover { background: var(--hover-bg); color: var(--text-primary); }
.filter-chip.active {
    background: var(--gradient-primary);
    color: white;
    border-color: transparent;
}
.filter-chip .count { font-size: 0.75rem; opacity: 0.85; margin-left: 0.25rem; }

/* Featured term */
.featured {
    max-width: 1000px; margin: 0 auto 2rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem 1.75rem;
    position: relative; overflow: hidden;
}
.featured::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: var(--gradient-accent);
}
.featured-label {
    display: inline-flex; align-items: center; gap: 0.4rem;
    font-size: 0.75rem; font-weight: 600;
    color: var(--accent-color); text-transform: uppercase; letter-spacing: 1px;
    margin-bottom: 0.5rem;
}
.featured-label::before {
    content: ''; width: 8px; height: 8px; border-radius: 50%;
    background: var(--success-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}
.featured h2 { font-size: 1.5rem; margin-bottom: 0.5rem; color: var(--text-primary); }
.featured p { color: var(--text-secondary); line-height: 1.65; }

/* Results */
.results-meta {
    max-width: 1000px; margin: 0 auto 1rem;
    color: var(--text-muted); font-size: 0.9rem;
}
.terms-grid {
    max-width: 1200px; margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1rem;
}
.term-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 1.25rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex; flex-direction: column; gap: 0.5rem;
    text-align: left;
    width: 100%;
    font-family: 'Amaranth', sans-serif;
    color: var(--text-primary);
}
.term-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-color);
}
.term-card-header { display: flex; align-items: baseline; justify-content: space-between; gap: 0.75rem; }
.term-card-title { font-family: 'Inter', sans-serif; font-size: 1.1rem; font-weight: 700; color: var(--text-primary); }
.term-card-acronym { font-size: 0.85rem; color: var(--text-muted); font-weight: 500; }
.term-card-category {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    font-size: 0.7rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px;
    background: var(--hover-bg); color: var(--text-secondary);
    border-radius: 6px;
    align-self: flex-start;
}
.term-card-def {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.55;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.term-card-courses { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-top: auto; }
.course-badge {
    padding: 0.15rem 0.5rem;
    font-size: 0.7rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--secondary-accent);
    border-radius: 4px;
    font-weight: 500;
}
[data-theme="dark"] .course-badge { background: rgba(99, 102, 241, 0.2); color: #A5B4FC; }
.bookmark-btn {
    position: absolute; top: 0.85rem; right: 0.85rem;
    width: 30px; height: 30px; border-radius: 8px;
    background: transparent; border: none; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    color: var(--text-muted); transition: all 0.15s ease;
}
.bookmark-btn:hover { background: var(--hover-bg); color: var(--accent-color); }
.bookmark-btn svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2; }
.bookmark-btn.active { color: var(--warning-color); }
.bookmark-btn.active svg { fill: currentColor; }
.term-card { position: relative; padding-right: 2.5rem; }

/* Empty state */
.empty-state {
    max-width: 500px; margin: 4rem auto;
    text-align: center; padding: 2rem;
    color: var(--text-muted);
}
.empty-state svg { width: 56px; height: 56px; margin-bottom: 1rem; stroke: var(--text-muted); fill: none; stroke-width: 1.5; }

/* Modal */
.modal-overlay {
    position: fixed; inset: 0;
    background: rgba(0, 0, 0, 0.6);
    display: none;
    align-items: flex-start; justify-content: center;
    z-index: 2000;
    padding: 2rem 1rem;
    overflow-y: auto;
    backdrop-filter: blur(4px);
}
.modal-overlay.open { display: flex; }
.modal {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    max-width: 720px; width: 100%;
    padding: 2rem;
    position: relative;
    box-shadow: var(--shadow-xl);
    animation: modalSlide 0.25s ease-out;
}
@keyframes modalSlide { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }
.modal-close {
    position: absolute; top: 1rem; right: 1rem;
    width: 36px; height: 36px; border-radius: 10px;
    background: var(--hover-bg); border: none; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
}
.modal-close:hover { background: var(--border-color); }
.modal-close svg { width: 18px; height: 18px; stroke: var(--text-primary); fill: none; stroke-width: 2; }
.modal-header { margin-bottom: 1.25rem; padding-right: 2.5rem; }
.modal-header h2 { font-size: 1.75rem; margin-bottom: 0.35rem; }
.modal-header .acronym { color: var(--text-muted); font-size: 1rem; font-weight: 500; }
.modal-meta { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.25rem; }
.modal-section { margin-bottom: 1.25rem; }
.modal-section h3 {
    font-size: 0.8rem; font-weight: 600; text-transform: uppercase; letter-spacing: 1px;
    color: var(--accent-color); margin-bottom: 0.5rem;
}
.modal-section p { color: var(--text-secondary); line-height: 1.7; }
.modal-section .example {
    background: var(--hover-bg);
    padding: 1rem 1.25rem; border-radius: 10px;
    border-left: 3px solid var(--accent-color);
    color: var(--text-primary); font-style: italic;
}
.formula-box {
    background: var(--hover-bg);
    padding: 1rem 1.25rem; border-radius: 10px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.05rem;
    text-align: center;
    margin-bottom: 0.5rem;
}
.case-study-box {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.06), rgba(14, 165, 233, 0.06));
    border: 1px solid var(--border-color);
    padding: 1rem 1.25rem; border-radius: 10px;
}
.case-study-box h4 { font-size: 1rem; margin-bottom: 0.25rem; }
.case-study-box .meta { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 0.5rem; }
.case-study-box .key-finding { margin-top: 0.5rem; padding-top: 0.5rem; border-top: 1px solid var(--border-color); font-size: 0.9rem; }
.related-list { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.related-pill {
    padding: 0.35rem 0.75rem;
    background: var(--hover-bg);
    color: var(--text-primary);
    border-radius: 8px;
    font-size: 0.85rem;
    cursor: pointer; border: 1px solid transparent;
    transition: all 0.15s ease;
    font-family: 'Amaranth', sans-serif;
}
.related-pill:hover { border-color: var(--accent-color); color: var(--accent-color); }
.sources-list { font-size: 0.85rem; color: var(--text-muted); }
.modal-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.5rem; padding-top: 1.25rem; border-top: 1px solid var(--border-color); }
.btn {
    display: inline-flex; align-items: center; gap: 0.4rem;
    padding: 0.55rem 1rem;
    font-family: 'Amaranth', sans-serif; font-size: 0.9rem; font-weight: 600;
    border-radius: 10px; cursor: pointer; text-decoration: none;
    transition: all 0.2s ease; border: 1px solid var(--border-color);
    background: var(--card-bg); color: var(--text-primary);
}
.btn:hover { border-color: var(--accent-color); color: var(--accent-color); }
.btn-primary { background: var(--gradient-primary); color: white; border-color: transparent; -webkit-text-fill-color: white; }
.btn-primary:hover { color: white; transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 2; }

/* Status banner */
.status-banner {
    max-width: 1000px; margin: 0 auto 1rem;
    padding: 0.65rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-size: 0.85rem; color: var(--text-secondary);
    display: flex; align-items: center; gap: 0.5rem;
}
.status-banner.offline { border-color: var(--warning-color); background: rgba(245, 158, 11, 0.08); }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--success-color); flex-shrink: 0; }
.status-banner.offline .status-dot { background: var(--warning-color); }

/* Submit form */
.submit-panel {
    max-width: 640px; margin: 0 auto;
}
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.3rem; font-weight: 600; font-size: 0.9rem; color: var(--text-primary); }
.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 0.7rem 0.9rem;
    font-family: 'Amaranth', sans-serif;
    font-size: 0.95rem;
    background: var(--primary-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s ease;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { border-color: var(--accent-color); }
.form-group textarea { resize: vertical; min-height: 100px; }
.form-hint { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.3rem; }

/* Footer */
.footer {
    background: var(--secondary-bg);
    border-top: 1px solid var(--border-color);
    padding: 3rem 1.5rem 1.5rem;
    position: relative; z-index: 1;
}
.footer-content { max-width: 1200px; margin: 0 auto; }
.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem; margin-bottom: 2rem;
}
.footer-section h4 {
    color: var(--text-primary); font-size: 0.85rem; font-weight: 600;
    margin-bottom: 1rem; text-transform: uppercase; letter-spacing: 0.5px;
}
.footer-section ul { list-style: none; }
.footer-section li { margin-bottom: 0.5rem; }
.footer-section a { color: var(--text-secondary); font-size: 0.88rem; }
.footer-section a:hover { color: var(--accent-color); }
.footer-bottom {
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex; flex-wrap: wrap;
    justify-content: space-between; align-items: center; gap: 1rem;
}
.footer-copyright { color: var(--text-muted); font-size: 0.82rem; }

@media (max-width: 640px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .page-hero { padding: 2rem 1rem 1.5rem; }
    .container { padding: 1rem 1rem 3rem; }
    .terms-grid { grid-template-columns: 1fr; }
    .modal { padding: 1.25rem; }
}

main p a[href]:not([class*="btn"]):not([class*="button"]):not([role="button"]),
main li a[href]:not([class*="btn"]):not([class*="button"]):not([role="button"]) {
    text-decoration: underline;
    text-underline-offset: 0.15em;
}