/* AC Engine 5.0 - Professional Industrial Enterprise Stylesheet */
:root {
    --bg-page: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-alt: #f1f5f9;
    --border: #e2e8f0;
    --border-dark: #cbd5e1;
    --border-accent: #38bdf8;
    --text-title: #0f172a;
    --text-body: #334155;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    --primary: #0284c7;
    --primary-hover: #0369a1;
    --primary-light: #e0f2fe;
    --accent-cyan: #0284c7;
    --success: #16a34a;
    --success-bg: #dcfce7;
    --danger: #dc2626;
    --danger-bg: #fee2e2;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'IBM Plex Mono', Menlo, Monaco, Consolas, monospace;
}

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

body {
    background-color: var(--bg-page);
    color: var(--text-body);
    font-family: var(--font-sans);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

/* Top Engineering Spec Stripe */
.top-stripe {
    background: #0f172a;
    color: #94a3b8;
    padding: 8px 32px;
    font-family: var(--font-mono);
    font-size: 11px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #1e293b;
}

.top-stripe span {
    color: #38bdf8;
    font-weight: 600;
}

/* Navigation */
nav {
    background: #ffffff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 14px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.nav-logo-icon {
    height: 38px;
    width: auto;
    display: block;
}

.brand-text {
    font-size: 19px;
    font-weight: 800;
    letter-spacing: 0.5px;
    color: var(--text-title);
    display: flex;
    align-items: center;
    gap: 8px;
}

.brand-badge {
    background: var(--primary-light);
    border: 1px solid #bae6fd;
    color: var(--primary);
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
}

.nav-links {
    display: flex;
    gap: 28px;
    align-items: center;
    font-size: 14px;
    font-weight: 500;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    padding: 6px 0;
    border-bottom: 2px solid transparent;
    transition: all 0.15s ease;
}

.nav-links a:hover {
    color: var(--primary);
}

.nav-links a.active {
    color: var(--primary);
    font-weight: 600;
    border-bottom-color: var(--primary);
}

.btn-nav {
    background: var(--primary);
    color: #ffffff !important;
    border: 1px solid var(--primary-hover);
    padding: 8px 18px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    box-shadow: 0 2px 6px rgba(2, 132, 199, 0.25);
    transition: all 0.15s ease;
}

.btn-nav:hover {
    background: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(2, 132, 199, 0.35);
    transform: translateY(-1px);
}

/* Layout Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px;
}

/* Page Header */
.page-header {
    background: #ffffff;
    border-bottom: 1px solid var(--border);
    padding: 48px 0;
}

.page-header h1 {
    font-size: 34px;
    font-weight: 800;
    color: var(--text-title);
    letter-spacing: -0.5px;
    margin-bottom: 10px;
}

.page-header p.lead {
    font-size: 17px;
    color: var(--text-muted);
    max-width: 780px;
    line-height: 1.6;
}

/* Hero Section */
.hero {
    background: linear-gradient(180deg, #ffffff 0%, var(--bg-page) 100%);
    padding: 72px 0 60px;
    border-bottom: 1px solid var(--border);
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--success-bg);
    border: 1px solid #bbf7d0;
    border-radius: 20px;
    padding: 5px 14px;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 600;
    color: #15803d;
    margin-bottom: 24px;
}

.hero-badge .status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #16a34a;
}

.hero h1 {
    font-size: 44px;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.8px;
    color: var(--text-title);
    max-width: 920px;
    margin: 0 auto 20px;
}

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

.hero p.lead {
    font-size: 18px;
    color: var(--text-body);
    max-width: 780px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

/* Hero Actions */
.hero-actions {
    display: flex;
    gap: 16px;
    align-items: center;
    justify-content: center;
    margin-bottom: 56px;
}

.btn-primary {
    background: var(--primary);
    color: #ffffff;
    padding: 13px 28px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--primary-hover);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(2, 132, 199, 0.25);
    transition: all 0.15s ease;
}

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 4px 14px rgba(2, 132, 199, 0.4);
    transform: translateY(-1px);
}

.btn-secondary {
    background: #ffffff;
    color: var(--text-title);
    padding: 13px 24px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    border: 1px solid var(--border-dark);
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    transition: all 0.15s ease;
}

.btn-secondary:hover {
    background: var(--bg-card-alt);
    border-color: #94a3b8;
}

/* 3-Pillar Value Cards */
.value-pillars-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 48px;
    text-align: left;
}

@media (max-width: 860px) {
    .value-pillars-grid { grid-template-columns: 1fr; }
}

.pillar-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 26px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
    transition: all 0.2s ease;
}

.pillar-card:hover {
    border-color: var(--border-accent);
    box-shadow: 0 8px 24px rgba(2, 132, 199, 0.1);
    transform: translateY(-2px);
}

.pillar-icon {
    font-size: 26px;
    margin-bottom: 14px;
    display: inline-block;
}

.pillar-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-title);
    margin-bottom: 8px;
}

.pillar-card p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* Key Metrics Grid */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    text-align: left;
}

@media (max-width: 860px) {
    .metrics-grid { grid-template-columns: repeat(2, 1fr); }
}

.metric-card {
    background: #ffffff;
    border: 1px solid var(--border);
    padding: 20px 22px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.metric-label {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
    font-weight: 600;
}

.metric-value {
    font-family: var(--font-mono);
    font-size: 28px;
    font-weight: 800;
    color: var(--text-title);
}

.metric-value .unit {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    margin-left: 3px;
}

.metric-sub {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* Content Sections */
section {
    padding: 64px 0;
    border-bottom: 1px solid var(--border);
}

.section-header {
    margin-bottom: 36px;
}

.section-tag {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
    margin-bottom: 8px;
}

.section-title {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-title);
    letter-spacing: -0.4px;
}

.section-desc {
    font-size: 15px;
    color: var(--text-muted);
    max-width: 780px;
    margin-top: 8px;
    line-height: 1.6;
}

/* Specification & Comparison Tables */
.spec-table-container {
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    background: #ffffff;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

table.spec-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    text-align: left;
}

table.spec-table th {
    background: var(--bg-card-alt);
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
    font-weight: 700;
}

table.spec-table td {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border);
    color: var(--text-body);
}

table.spec-table tr:last-child td {
    border-bottom: none;
}

table.spec-table tr:hover td {
    background: #f8fafc;
}

table.spec-table td.strong {
    color: var(--text-title);
    font-weight: 600;
}

table.spec-table td.mono {
    font-family: var(--font-mono);
    color: var(--primary);
    font-weight: 600;
}

/* Comparison Badges */
.badge-win {
    display: inline-block;
    background: var(--success-bg);
    border: 1px solid #86efac;
    color: #166534;
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: 3px;
    text-transform: uppercase;
    margin-right: 6px;
}

.badge-loss {
    display: inline-block;
    background: var(--danger-bg);
    border: 1px solid #fca5a5;
    color: #991b1b;
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: 3px;
    text-transform: uppercase;
    margin-right: 6px;
}

/* Signal Analysis Container */
.plot-container {
    background: #0f172a;
    border: 1px solid #1e293b;
    border-radius: 8px;
    padding: 24px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
}

.plot-meta-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #1e293b;
    padding-bottom: 14px;
    margin-bottom: 18px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: #94a3b8;
}

.plot-meta-header span.highlight {
    color: #38bdf8;
    font-weight: 600;
}

.plot-svg-frame {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 6px;
}

.plot-explanation-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 24px;
}

@media (max-width: 860px) {
    .plot-explanation-grid { grid-template-columns: 1fr; }
}

.plot-expl-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 16px 20px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.03);
}

.plot-expl-num {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--primary);
    margin-bottom: 4px;
    font-weight: 700;
}

.plot-expl-card h4 {
    font-size: 14px;
    color: var(--text-title);
    margin-bottom: 6px;
    font-weight: 700;
}

.plot-expl-card p {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Architecture Safeguards Grid */
.arch-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

@media (max-width: 860px) {
    .arch-grid { grid-template-columns: 1fr; }
}

.arch-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 26px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.arch-num {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 8px;
}

.arch-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-title);
    margin-bottom: 10px;
}

.arch-card p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* 4-Step Protocol Grid */
.protocol-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

@media (max-width: 860px) {
    .protocol-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 500px) {
    .protocol-grid { grid-template-columns: 1fr; }
}

.protocol-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.protocol-step {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 8px;
}

.protocol-card h4 {
    font-size: 16px;
    color: var(--text-title);
    margin-bottom: 8px;
    font-weight: 700;
}

.protocol-card p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Code Block */
.code-box {
    background: #0f172a;
    border: 1px solid #1e293b;
    border-radius: 8px;
    overflow: hidden;
    font-family: var(--font-mono);
    font-size: 13px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.code-bar {
    background: #1e293b;
    padding: 10px 20px;
    border-bottom: 1px solid #334155;
    display: flex;
    justify-content: space-between;
    color: #94a3b8;
    font-size: 11px;
}

.code-content {
    padding: 22px;
    overflow-x: auto;
    color: #cbd5e1;
    line-height: 1.7;
}

.code-content .c-kw { color: #f43f5e; }
.code-content .c-typ { color: #38bdf8; }
.code-content .c-fn { color: #fbbf24; }
.code-content .c-com { color: #64748b; font-style: italic; }
.code-content .c-num { color: #a78bfa; }

/* Chips */
.hw-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}

.chip-badge {
    background: #ffffff;
    border: 1px solid var(--border-dark);
    padding: 6px 14px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-title);
    font-weight: 500;
}

/* Evaluation Form Box */
.eval-box {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 36px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin: 20px 0;
}

@media (max-width: 620px) {
    .form-grid { grid-template-columns: 1fr; }
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    text-align: left;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.form-input, .form-select {
    background: #ffffff;
    border: 1px solid var(--border-dark);
    border-radius: 6px;
    padding: 10px 14px;
    color: var(--text-title);
    font-family: var(--font-sans);
    font-size: 14px;
    outline: none;
    transition: all 0.15s ease;
}

.form-input:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

/* Direct Contact Cards */
.direct-contact-cards {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-top: 28px;
}

.contact-channel-card {
    background: var(--bg-card-alt);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px 24px;
    text-align: left;
    flex: 1;
    min-width: 280px;
    transition: all 0.15s ease;
}

.contact-channel-card:hover {
    border-color: var(--primary);
    background: #ffffff;
    box-shadow: 0 4px 12px rgba(2, 132, 199, 0.08);
}

.contact-channel-title {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
    font-weight: 700;
}

.contact-channel-val {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-title);
    margin-bottom: 4px;
}

.contact-channel-desc {
    font-size: 12px;
    color: var(--text-muted);
}

/* Toast Notification */
.toast-notification {
    position: fixed;
    bottom: 28px;
    right: 28px;
    background: #0f172a;
    border: 1px solid #334155;
    color: #f8fafc;
    padding: 14px 22px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    display: none;
    align-items: center;
    gap: 10px;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
    z-index: 2000;
}

.toast-notification.active {
    display: flex;
    animation: fadeInToast 0.2s ease;
}

@keyframes fadeInToast {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Footer */
footer {
    background: #ffffff;
    border-top: 1px solid var(--border);
    padding: 40px 32px;
    font-size: 13px;
    color: var(--text-muted);
}

.footer-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: 20px;
    transition: color 0.15s ease;
}

.footer-links a:hover {
    color: var(--primary);
}

@media (max-width: 768px) {
    .hero h1 { font-size: 32px; }
    .hero-actions { flex-direction: column; align-items: stretch; }
    .nav-links { display: none; }
}