/* ===== YAIFA Homepage — Central CSS for fonts, colors, and shared layout ===== */

/* ---------- CSS Variables ---------- */
:root {
    --ya-primary: #2B2B2B;
    --ya-accent: #2B2B2B;
    --ya-secondary: #2B2B2B;
    --ya-bg: #F6F6F6;
    --ya-surface: #ffffff;
    --ya-line: #BEBEBE;
    --ya-canvas: #2B2B2B;
    --ya-canvas-2: #2B2B2B;
    --ya-canvas-3: #2B2B2B;
    --ya-soft: #BEBEBE;
}

/* ---------- Base styles ---------- */
html, body {
    margin: 0;
    padding: 0;
    background: var(--ya-bg);
    color: var(--ya-primary);
    font-family: Montserrat, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.ya-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ---------- Top nav ---------- */
.ya-nav {
    flex: 0 0 auto;
    background: var(--ya-canvas-2);
    border-bottom: 1px solid var(--ya-canvas-3);
    color: #ffffff;
}
.ya-nav-row {
    max-width: 1080px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.7rem 1.5rem;
}
.ya-nav-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    color: #ffffff;
    text-decoration: none;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.9rem;
}
.ya-nav-brand img {
    width: 2.25rem;
    height: 2.25rem;
    object-fit: contain;
    flex-shrink: 0;
}
.ya-nav-brand:hover { opacity: 0.9; }
.ya-nav-tag {
    margin-left: auto;
    font-size: 0.66rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.55);
    border-left: 1px solid rgba(255, 255, 255, 0.12);
    padding-left: 0.75rem;
}

/* ---------- Main content area (subpages) ---------- */
.ya-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 1.5rem 5rem;
    flex: 1 1 auto;
    width: 100%;
    box-sizing: border-box;
}

.ya-back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--ya-accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 2rem;
    transition: color 0.2s ease, transform 0.2s ease;
}
.ya-back-link:hover {
    color: var(--ya-primary);
    transform: translateX(-4px);
}

.ya-header {
    margin-bottom: 2.5rem;
}

.ya-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    background: rgba(43, 43, 43, 0.06);
    color: var(--ya-primary);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.ya-title-row {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    margin-bottom: 1rem;
}

.ya-title-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 14px;
    color: #ffffff;
    font-size: 1.75rem;
    flex-shrink: 0;
}

h1 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--ya-primary);
    margin: 0;
    letter-spacing: -0.01em;
}

.ya-lead {
    font-size: clamp(1.05rem, 2vw, 1.2rem);
    line-height: 1.6;
    color: var(--ya-secondary);
    font-weight: 400;
    margin-top: 1rem;
}

/* ---------- Content blocks ---------- */
.ya-card {
    background: var(--ya-surface);
    border: 1px solid var(--ya-line);
    border-radius: 16px;
    padding: 2.25rem 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 20px rgba(43, 43, 43, 0.02);
}

h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--ya-primary);
    margin-top: 0;
    margin-bottom: 1.25rem;
    border-bottom: 2px solid var(--ya-line);
    padding-bottom: 0.5rem;
}

p {
    line-height: 1.7;
    margin-top: 0;
    margin-bottom: 1.25rem;
    font-size: 0.96rem;
    color: var(--ya-secondary);
}

ul {
    padding-left: 1.25rem;
    margin-top: 0;
    margin-bottom: 1.25rem;
}

li {
    line-height: 1.7;
    margin-bottom: 0.5rem;
    font-size: 0.96rem;
    color: var(--ya-secondary);
}

strong {
    color: var(--ya-primary);
    font-weight: 600;
}

/* ---------- Code formatting ---------- */
pre {
    background: #2B2B2B;
    color: #F6F6F6;
    padding: 1.25rem;
    border-radius: 10px;
    overflow-x: auto;
    margin: 1.25rem 0;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.85rem;
    line-height: 1.5;
}
code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    background: rgba(43, 43, 43, 0.06);
    color: var(--ya-primary);
    padding: 0.15rem 0.35rem;
    border-radius: 4px;
    font-size: 0.85rem;
}
pre code {
    background: transparent;
    color: inherit;
    padding: 0;
    border-radius: 0;
    font-size: inherit;
}

/* ---------- Tables ---------- */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.92rem;
}
th, td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--ya-line);
}
th {
    background: rgba(43, 43, 43, 0.03);
    font-weight: 600;
    color: var(--ya-primary);
}

/* ---------- Footer ---------- */
.ya-footer {
    flex: 0 0 auto;
    padding: 1.1rem 1.5rem;
    background: #ffffff;
    border-top: 1px solid var(--ya-line);
    color: var(--ya-secondary);
    font-size: 0.78rem;
    text-align: center;
    letter-spacing: 0.04em;
}
.ya-footer strong {
    color: var(--ya-primary);
    font-weight: 600;
}

/* ---------- Images ---------- */
.ya-figure {
    margin: 2rem 0;
    text-align: center;
}
.ya-figure img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    border: 1px solid var(--ya-line);
    box-shadow: 0 4px 20px rgba(43, 43, 43, 0.08);
}
.ya-figure figcaption {
    margin-top: 0.75rem;
    font-size: 0.82rem;
    color: var(--ya-secondary);
    font-style: italic;
    line-height: 1.5;
}

/* ---------- Hamburger menu ---------- */
.ya-nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    color: #ffffff;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease;
    flex-shrink: 0;
}
.ya-nav-toggle:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.3);
}

.ya-menu-overlay {
    position: fixed !important;
    inset: 0 !important;
    background: rgba(0, 0, 0, 0.45) !important;
    opacity: 0 !important;
    visibility: hidden !important;
    transition: opacity 0.3s ease, visibility 0.3s ease !important;
    z-index: 9998 !important;
    pointer-events: none !important;
}
.ya-menu-overlay.is-open {
    opacity: 1 !important;
    visibility: visible !important;
    pointer-events: auto !important;
}

.ya-menu {
    position: fixed !important;
    top: 0 !important;
    right: 0 !important;
    width: min(340px, 85vw) !important;
    height: 100vh !important;
    max-height: 100vh !important;
    background: var(--ya-surface) !important;
    border-left: 1px solid var(--ya-line) !important;
    box-shadow: -10px 0 40px rgba(0, 0, 0, 0.15) !important;
    transform: translateX(100%) !important;
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1) !important;
    z-index: 9999 !important;
    display: flex !important;
    flex-direction: column !important;
    overflow-y: auto !important;
    margin: 0 !important;
    padding: 0 !important;
}
.ya-menu.is-open {
    transform: translateX(0) !important;
}

.ya-menu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    background: var(--ya-canvas-2);
    color: #ffffff;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.ya-menu-header span {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}
.ya-menu-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    background: transparent;
    border: none;
    color: #ffffff;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.2s ease;
}
.ya-menu-close:hover { opacity: 1; }

.ya-menu-body {
    flex: 1 1 auto;
    padding: 1.25rem;
}

.ya-menu-section {
    margin-bottom: 1.75rem;
}
.ya-menu-section h4 {
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--ya-secondary);
    margin: 0 0 0.6rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid var(--ya-line);
}
.ya-menu-link {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.55rem 0.5rem;
    text-decoration: none;
    color: var(--ya-primary);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 8px;
    transition: background 0.15s ease;
}
.ya-menu-link:hover {
    background: rgba(43, 43, 43, 0.06);
}
.ya-menu-link i {
    font-size: 1rem;
    color: var(--ya-accent);
    width: 1.4rem;
    text-align: center;
    flex-shrink: 0;
}
.ya-menu-link--highlight {
    background: rgba(43, 43, 43, 0.04);
    border: 1px solid var(--ya-line);
    font-weight: 600;
}
.ya-menu-link--highlight i {
    color: #a855f7;
}

.ya-menu-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--ya-line);
    font-size: 0.76rem;
    color: var(--ya-secondary);
    text-align: center;
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
    .ya-container { padding: 2rem 1.25rem 3rem; }
    .ya-card { padding: 1.5rem 1.25rem; }
    .ya-title-row { gap: 0.75rem; }
    .ya-title-icon { width: 2.75rem; height: 2.75rem; font-size: 1.35rem; }
    .ya-nav-tag { display: none; }
}