@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

:root {
    --green-dark:   #1B5E20;
    --green-mid:    #2E7D32;
    --green-pale:   #F1F8F2;
    --text-primary:   #1a1a1a;
    --text-secondary: #4a5568;
    --text-muted:     #718096;
    --white:    #ffffff;
    --bg-light: #f8f9f7;
    --border:   #dde4d9;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.07);
    --shadow-md: 0 4px 14px rgba(0,0,0,0.09);
    --radius:    10px;
    --radius-sm: 6px;
    --t: 0.22s ease;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: 'Outfit', 'Segoe UI', system-ui, sans-serif;
    color: var(--text-primary);
    background: var(--bg-light);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ─── HEADER ─────────────────────────────────── */
.header {
    background: var(--white);
    position: sticky;
    top: 0;
    z-index: 100;
    height: 68px;
    border-bottom: 1px solid var(--border);
    transition: box-shadow var(--t);
}

.header.scrolled {
    box-shadow: 0 2px 18px rgba(0,0,0,0.09);
    border-bottom-color: transparent;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    height: 68px;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
}

.logo img {
    height: 42px;
    width: auto;
    object-fit: contain;
}

.doc-breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex: 1;
    font-size: 0.875rem;
    min-width: 0;
    overflow: hidden;
}

.breadcrumb-home {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    color: var(--text-muted);
    text-decoration: none;
    white-space: nowrap;
    transition: color var(--t);
}

.breadcrumb-home:hover { color: var(--green-dark); }

.breadcrumb-sep {
    color: var(--border);
    flex-shrink: 0;
}

.breadcrumb-current {
    color: var(--text-primary);
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: var(--green-pale);
    color: var(--green-dark);
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    white-space: nowrap;
    flex-shrink: 0;
    transition: all var(--t);
}

.back-btn:hover {
    background: var(--green-dark);
    color: var(--white);
}

/* ─── MAIN ───────────────────────────────────── */
.main {
    flex: 1;
    padding: 2rem 0 3rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ─── DOC INFO CARD ──────────────────────────── */
.doc-info-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem 1.75rem;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-sm);
}

.doc-info-icon {
    width: 54px;
    height: 54px;
    background: var(--green-pale);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--green-dark);
}

.doc-info-body { flex: 1; min-width: 0; }

.doc-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
    letter-spacing: -0.01em;
}

.doc-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.55;
}

.doc-open-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1.25rem;
    background: var(--green-dark);
    color: var(--white);
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
    transition: all var(--t);
}

.doc-open-btn:hover {
    background: var(--green-mid);
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(27,94,32,0.3);
}

/* ─── DOC NAV ────────────────────────────────── */
.doc-nav {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
}

.doc-nav-item {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 0.9rem;
    border: 1.5px solid var(--border);
    background: var(--white);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 500;
    transition: all var(--t);
}

.doc-nav-item:hover {
    border-color: var(--green-dark);
    color: var(--green-dark);
    background: var(--green-pale);
}

.doc-nav-item.active {
    background: var(--green-dark);
    color: var(--white);
    border-color: var(--green-dark);
}

/* ─── VIEWER ─────────────────────────────────── */
.doc-viewer-wrap {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    position: relative;
    min-height: 78vh;
    display: flex;
    flex-direction: column;
}

.doc-loading {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    background: var(--white);
    z-index: 10;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.doc-loading-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--border);
    border-top: 3px solid var(--green-dark);
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.doc-frame {
    width: 100%;
    flex: 1;
    min-height: 78vh;
    border: none;
    display: none;
}

.doc-error {
    flex: 1;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 3rem 2rem;
    text-align: center;
    color: var(--text-secondary);
}

.doc-error-icon { color: var(--border); margin-bottom: 0.5rem; }

.doc-error h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
}

.doc-error p { font-size: 0.875rem; max-width: 360px; }

/* ─── FOOTER ─────────────────────────────────── */
.footer-bottom {
    background: #18201a;
    padding: 1.5rem 0;
    margin-top: auto;
}

.footer-bottom-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    text-align: center;
}

.footer-links {
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

.footer-links a {
    color: rgba(255,255,255,0.45);
    text-decoration: none;
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    transition: color var(--t);
}

.footer-links a:hover { color: rgba(255,255,255,0.82); }

.accent-dot {
    display: inline-block;
    width: 3px;
    height: 3px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    vertical-align: middle;
}

.copyright { font-size: 0.78rem; color: rgba(255,255,255,0.3); }

/* ─── RESPONSIVE ─────────────────────────────── */
@media (max-width: 768px) {
    .nav-container { padding: 0 1.25rem; gap: 0.75rem; }
    .doc-breadcrumb { display: none; }
    .doc-info-card { flex-wrap: wrap; }
    .doc-open-btn { width: 100%; justify-content: center; }
    .container { padding: 0 1.25rem; }
    .doc-frame, .doc-viewer-wrap { min-height: 70vh; }
}

@media (max-width: 480px) {
    .doc-nav-item span { display: none; }
    .main { padding: 1.5rem 0 2rem; }
}