/* Share Whitepaper - Main Stylesheet
   Theme: Deep navy + cyan (#00d4ff) + green (#00ff88) + purple (#7c3aed)
   No inline styles - all classes
*/

/* ── Reset & Base ── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    background: transparent;
    min-height: 100%;
}

:root {
    --cyan:    #00d4ff;
    --green:   #00ff88;
    --purple:  #7c3aed;
    --red:     #ff4757;
    --amber:   #ffaa00;
    --bg:      #040810;
    --surface: #080f1c;
    --card:    rgba(8,15,28,0.85);
    --border:  rgba(0,212,255,0.18);
    --border-g: rgba(0,255,136,0.15);
    --text:    #d8eaf8;
    --text-dim: #6080a0;
    --heading: #e8f4ff;
    --cyan-glow:   0 0 20px rgba(0,212,255,0.35);
    --green-glow:  0 0 20px rgba(0,255,136,0.3);
    --purple-glow: 0 0 20px rgba(124,58,237,0.35);
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
}

/* ── Layout ── */
.content-layout {
    display: flex;
    align-items: flex-start;
    position: relative;
    z-index: 10;
}

main {
    flex: 1 1 0;
    min-width: 0;
    position: relative;
}

/* ── TOC Sidebar ── */
.toc-sidebar {
    width: 220px;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    max-height: 100vh;
    overflow-y: auto;
    border-right: 1px solid var(--border);
    padding: 24px 0;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.toc-sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.toc-sidebar-group {
    display: flex;
    flex-direction: column;
}

.toc-tab-heading {
    background: none;
    border: none;
    border-left: 3px solid transparent;
    cursor: pointer;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-dim);
    padding: 10px 20px 10px 17px;
    text-align: left;
    transition: color 0.2s, border-color 0.2s, background 0.2s;
    width: 100%;
    border-radius: 0 4px 4px 0;
}

.toc-tab-heading:hover {
    color: var(--cyan);
    background: rgba(0,212,255,0.05);
}

.toc-sidebar-group.active .toc-tab-heading {
    color: var(--cyan);
    border-left-color: var(--cyan);
    background: rgba(0,212,255,0.08);
}

.toc-sidebar-list {
    list-style: none;
    padding: 0 0 10px;
    display: none;
}

.toc-sidebar-group.active .toc-sidebar-list {
    display: block;
}

.toc-sidebar-list a {
    display: block;
    padding: 5px 20px 5px 28px;
    font-size: 0.78rem;
    color: var(--text-dim);
    text-decoration: none;
    transition: color 0.2s, background 0.2s;
    border-radius: 0 4px 4px 0;
}

.toc-sidebar-list a:hover,
.toc-sidebar-list a.active {
    color: var(--cyan);
    background: rgba(0,212,255,0.06);
}

/* ── Header ── */
.swp-header {
    background: linear-gradient(135deg, #030912 0%, #040d1e 50%, #030a14 100%);
    padding: 1.8rem 1.5rem;
    border-bottom: 2px solid rgba(0,212,255,0.3);
    box-shadow: 0 4px 24px rgba(0,212,255,0.12);
    position: relative;
    z-index: 50;
}

.swp-header::after {
    content: '';
    position: absolute;
    bottom: -2px; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--cyan), var(--green), transparent);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
}

.header-top {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
    transition: transform 0.3s;
}

.logo-link:hover { transform: scale(1.05); }

.logo-image {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    border: 2px solid rgba(0,212,255,0.4);
    box-shadow: 0 0 16px rgba(0,212,255,0.2);
}

.header-text {
    flex: 1;
}

.page-title {
    font-size: clamp(1.3rem, 3.5vw, 2rem);
    font-weight: 800;
    color: var(--heading);
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: 0.3rem;
}

.page-subtitle {
    font-size: 0.95rem;
    color: var(--text-dim);
    line-height: 1.5;
}

.header-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
}

.meta-badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.meta-badge-pqc {
    background: rgba(0,212,255,0.12);
    border: 1px solid rgba(0,212,255,0.35);
    color: var(--cyan);
}

.meta-badge-zk {
    background: rgba(0,255,136,0.1);
    border: 1px solid rgba(0,255,136,0.3);
    color: var(--green);
}

.meta-badge-dual {
    background: rgba(124,58,237,0.12);
    border: 1px solid rgba(124,58,237,0.35);
    color: #b78bf8;
}

.meta-author {
    font-size: 0.78rem;
    color: var(--text-dim);
    margin-left: auto;
}

/* ── Tab Bar ── */
.tab-bar {
    background: rgba(4,8,16,0.95);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.tab-bar-inner {
    display: flex;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.tab-bar-btn {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-dim);
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    padding: 0.75rem 1.1rem;
    transition: color 0.2s, border-color 0.2s;
    white-space: nowrap;
}

.tab-bar-btn:hover { color: var(--cyan); }

.tab-bar-btn.active {
    color: var(--cyan);
    border-bottom-color: var(--cyan);
}

/* ── Tab Content ── */
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── Content Wrapper ── */
.content-wrapper {
    padding: 2rem 2.5rem;
    max-width: 100%;
}

/* ── Typography ── */
.section-heading {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--heading);
    margin: 2.2rem 0 0.9rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid var(--border);
    scroll-margin-top: 80px;
}

.section-heading.cyan-accent { border-bottom-color: rgba(0,212,255,0.4); color: var(--cyan); }
.section-heading.green-accent { border-bottom-color: rgba(0,255,136,0.4); color: var(--green); }
.section-heading.purple-accent { border-bottom-color: rgba(124,58,237,0.4); color: #b78bf8; }

.subsection-heading {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--cyan);
    margin: 1.6rem 0 0.6rem;
    scroll-margin-top: 80px;
}

.prose {
    font-size: 0.95rem;
    color: var(--text);
    margin-bottom: 1rem;
    line-height: 1.75;
}

.prose code {
    font-family: 'Courier New', monospace;
    font-size: 0.85em;
    background: rgba(0,212,255,0.08);
    border: 1px solid rgba(0,212,255,0.2);
    border-radius: 3px;
    padding: 1px 5px;
    color: var(--cyan);
}

/* ── Abstract / Overview Cards ── */
.overview-intro {
    margin-bottom: 2rem;
}

.abstract-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-left: 4px solid var(--cyan);
    border-radius: 10px;
    padding: 1.4rem 1.6rem;
    margin-bottom: 1.2rem;
    box-shadow: var(--cyan-glow);
}

.abstract-label {
    display: inline-block;
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--cyan);
    background: rgba(0,212,255,0.1);
    border: 1px solid rgba(0,212,255,0.3);
    border-radius: 3px;
    padding: 2px 8px;
    margin-bottom: 0.8rem;
}

.abstract-text {
    font-size: 0.96rem;
    color: var(--text);
    line-height: 1.78;
}

.warning-box {
    background: rgba(0,255,136,0.06);
    border: 1px solid rgba(0,255,136,0.25);
    border-left: 4px solid var(--green);
    border-radius: 8px;
    padding: 1rem 1.3rem;
    font-size: 0.9rem;
    color: var(--text);
}

/* ── Algo Security Table ── */
.algo-table {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    margin: 1.2rem 0;
    font-size: 0.85rem;
}

.algo-row {
    display: grid;
    grid-template-columns: 1.8fr 1fr 2fr 1fr 1fr;
    gap: 0;
    border-bottom: 1px solid rgba(0,212,255,0.08);
    padding: 0.6rem 1rem;
    align-items: center;
}

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

.algo-row-header {
    background: rgba(0,212,255,0.07);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--cyan);
}

.algo-name  { font-weight: 700; color: var(--heading); font-family: 'Courier New', monospace; }
.algo-fips  { color: var(--text-dim); font-family: 'Courier New', monospace; font-size: 0.8rem; }
.algo-role  { color: var(--text); }
.algo-level { font-weight: 700; }
.level-5    { color: var(--cyan); }
.algo-threat { font-weight: 600; }
.threat-safe { color: var(--green); }
.threat-warn { color: var(--amber); }
.threat-label { color: var(--text-dim); }

/* ── Spec Note ── */
.spec-note {
    font-size: 0.8rem;
    color: var(--text-dim);
    padding: 0.5rem 1rem 0.8rem;
    line-height: 1.5;
}

/* ── Flow Diagram ── */
.flow-diagram {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.4rem;
    margin: 1.2rem 0;
}

.flow-title {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--cyan);
    margin-bottom: 1.2rem;
}

.flow-steps {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.flow-step {
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
    padding: 0.6rem 0.9rem;
    background: rgba(0,212,255,0.04);
    border: 1px solid rgba(0,212,255,0.1);
    border-radius: 6px;
    font-size: 0.87rem;
    color: var(--text);
}

.flow-step-num {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 26px;
    height: 26px;
    background: rgba(0,212,255,0.15);
    border: 1px solid rgba(0,212,255,0.4);
    border-radius: 50%;
    font-weight: 800;
    font-size: 0.72rem;
    color: var(--cyan);
    flex-shrink: 0;
}

.flow-step-text strong { color: var(--cyan); }

.flow-connector {
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(0,212,255,0.35);
    font-size: 1rem;
    height: 16px;
}

/* ── Two-column split panels ── */
.split-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin: 1.2rem 0;
}

.panel {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.2rem 1.3rem;
}

.panel-label {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 0.8rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.panel-cyan  { border-left: 3px solid var(--cyan);  }
.panel-green { border-left: 3px solid var(--green); }

.panel-label-cyan  { color: var(--cyan);  border-bottom-color: rgba(0,212,255,0.25); }
.panel-label-green { color: var(--green); border-bottom-color: rgba(0,255,136,0.25); }

.panel ul {
    padding-left: 1.2rem;
    font-size: 0.88rem;
    color: var(--text);
    line-height: 1.7;
}

.panel li { margin-bottom: 0.3rem; }

/* ── Highlight Box ── */
.highlight-box {
    background: rgba(124,58,237,0.07);
    border: 1px solid rgba(124,58,237,0.3);
    border-left: 4px solid var(--purple);
    border-radius: 8px;
    padding: 1rem 1.3rem;
    margin: 1.2rem 0;
    font-size: 0.9rem;
    color: var(--text);
}

.highlight-box strong { color: #b78bf8; }

.highlight-list {
    margin-top: 0.5rem;
    padding-left: 1.4rem;
}

/* ── Info Grid (features) ── */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 0.9rem;
    margin: 1.2rem 0;
}

.info-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.1rem 1.2rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.info-card:hover {
    border-color: rgba(0,212,255,0.4);
    box-shadow: var(--cyan-glow);
}

.info-card-icon {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
    display: block;
}

.info-card-title {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--heading);
    margin-bottom: 0.35rem;
}

.info-card-text {
    font-size: 0.83rem;
    color: var(--text-dim);
    line-height: 1.6;
}

/* ── DB Schema Block ── */
.schema-block {
    background: rgba(4,12,24,0.9);
    border: 1px solid rgba(0,212,255,0.2);
    border-radius: 8px;
    padding: 1.2rem 1.4rem;
    margin: 1.2rem 0;
    overflow-x: auto;
}

.schema-block pre {
    font-family: 'Courier New', monospace;
    font-size: 0.82rem;
    color: var(--text);
    line-height: 1.6;
    white-space: pre;
}

.schema-block .sql-keyword { color: var(--cyan); font-weight: 700; }
.schema-block .sql-type    { color: var(--green); }
.schema-block .sql-comment { color: var(--text-dim); }
.schema-block .sql-string  { color: #ffaa44; }

/* ── URL Anatomy ── */
.url-anatomy {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.3rem 1.4rem;
    margin: 1.2rem 0;
}

.url-anatomy-title {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--cyan);
    margin-bottom: 1rem;
}

.url-line {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0;
    font-family: 'Courier New', monospace;
    font-size: 0.82rem;
    margin-bottom: 1rem;
    word-break: break-all;
}

.url-part { color: var(--text-dim); }
.url-id   { color: var(--cyan); }
.url-hash { color: var(--green); font-weight: 700; }

.url-legend {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    font-size: 0.82rem;
}

.url-legend-item {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.url-legend-key   { font-family: 'Courier New', monospace; min-width: 90px; flex-shrink: 0; }
.url-legend-key-id { color: var(--cyan); }
.url-legend-key-hash { color: var(--green); }
.url-legend-desc  { color: var(--text-dim); }

/* ── Threat Model Table ── */
.threat-table {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    margin: 1.2rem 0;
    font-size: 0.85rem;
}

.threat-row {
    display: grid;
    grid-template-columns: 2fr 1.5fr 1fr;
    border-bottom: 1px solid rgba(0,212,255,0.08);
    padding: 0.6rem 1rem;
    align-items: center;
    gap: 0.5rem;
}

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

.threat-row-header {
    background: rgba(0,212,255,0.07);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--cyan);
}

.threat-name   { font-weight: 600; color: var(--heading); }
.threat-status { font-weight: 700; }
.threat-how    { color: var(--text-dim); font-size: 0.8rem; }
.status-safe   { color: var(--green); }
.status-partial{ color: var(--amber); }

/* ── NIST Level Badge ── */
.nist-badge-wrap {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    background: rgba(0,212,255,0.1);
    border: 1px solid rgba(0,212,255,0.35);
    border-radius: 8px;
    padding: 0.5rem 0.9rem;
    margin: 0 0.5rem;
}

.nist-badge-num {
    font-size: 2rem;
    font-weight: 900;
    color: var(--cyan);
    line-height: 1;
}

.nist-badge-label {
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-dim);
}

/* ── Comparison Row ── */
.compare-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin: 1.2rem 0;
}

.compare-panel {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.2rem 1.3rem;
}

.compare-panel-zk { border-left: 3px solid var(--green); }
.compare-panel-classic { border-left: 3px solid var(--text-dim); }

.compare-label {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 0.7rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid var(--border);
}

.compare-label-zk { color: var(--green); }
.compare-label-classic { color: var(--text-dim); }

/* ── Perf Metrics Row ── */
.perf-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.8rem;
    margin: 1.2rem 0;
}

.perf-metric {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.9rem 1rem;
    text-align: center;
}

.perf-metric-value {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--cyan);
    display: block;
    margin-bottom: 0.2rem;
    font-family: 'Courier New', monospace;
}

.perf-metric-label {
    font-size: 0.75rem;
    color: var(--text-dim);
}

/* ── Live App CTA Box ── */
.cta-app-box {
    background: linear-gradient(135deg, rgba(0,212,255,0.07) 0%, rgba(0,255,136,0.05) 100%);
    border: 1px solid rgba(0,212,255,0.35);
    border-left: 4px solid var(--cyan);
    border-radius: 10px;
    padding: 1.2rem 1.4rem;
    margin: 1.6rem 0;
    box-shadow: 0 0 24px rgba(0,212,255,0.1);
}

.cta-app-inner {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.cta-app-icon {
    font-size: 1.8rem;
    flex-shrink: 0;
}

.cta-app-text {
    flex: 1;
    min-width: 180px;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.cta-app-text strong {
    font-size: 0.92rem;
    color: var(--heading);
}

.cta-app-text span {
    font-size: 0.84rem;
    color: var(--text-dim);
    line-height: 1.5;
}

.cta-app-link {
    color: var(--cyan);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 1px solid rgba(0,212,255,0.3);
    transition: border-color 0.2s, color 0.2s;
}

.cta-app-link:hover {
    color: var(--green);
    border-bottom-color: rgba(0,255,136,0.5);
}

.cta-app-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.55rem 1.3rem;
    background: rgba(0,212,255,0.12);
    border: 1px solid rgba(0,212,255,0.45);
    border-radius: 6px;
    color: var(--cyan);
    font-size: 0.85rem;
    font-weight: 700;
    text-decoration: none;
    letter-spacing: 0.03em;
    white-space: nowrap;
    transition: background 0.2s, border-color 0.2s, color 0.2s, box-shadow 0.2s;
    flex-shrink: 0;
}

.cta-app-btn:hover {
    background: rgba(0,212,255,0.22);
    border-color: var(--cyan);
    color: #fff;
    box-shadow: 0 0 16px rgba(0,212,255,0.35);
}

/* ── Footer ── */
.swp-footer {
    background: rgba(4,8,16,0.95);
    border-top: 1px solid var(--border);
    padding: 1.2rem 2rem;
    text-align: center;
    font-size: 0.82rem;
    color: var(--text-dim);
    position: relative;
    z-index: 50;
}

.swp-footer a {
    color: var(--cyan);
    text-decoration: none;
    border-bottom: 1px solid rgba(0,212,255,0.25);
    transition: color 0.2s, border-color 0.2s;
}

.swp-footer a:hover {
    color: var(--green);
    border-bottom-color: rgba(0,255,136,0.4);
}

/* ── Responsive ── */
@media (max-width: 900px) {
    .toc-sidebar { display: none; }

    .split-panel,
    .compare-row { grid-template-columns: 1fr; }

    .algo-row {
        grid-template-columns: 1fr 1fr;
        font-size: 0.8rem;
    }

    .algo-row-header { display: none; }

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

@media (max-width: 600px) {
    .content-wrapper { padding: 1.2rem 1rem; }

    .header-top { flex-wrap: wrap; }

    .info-grid { grid-template-columns: 1fr; }

    .perf-metrics { grid-template-columns: 1fr 1fr; }

    .tab-bar-inner { overflow-x: auto; }
}