/**
 * CommerceForge Shell & Layout Architecture (Phase UI-01: Premium Commerce OS)
 *
 * Storefront Shell, Customer Application Shell, Admin SaaS Shell,
 * Responsive Grid, Header Navigation, and Editorial Footer.
 *
 * @author Jyotirmay Ray <https://jyotirmayray.in/>
 */

/* =============================================================================
 * 1. GRID & CONTAINER ARCHITECTURE
 * ========================================================================== */
.cf-container {
    width: 100%;
    max-width: var(--cf-container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--cf-gutter-desktop);
    padding-right: var(--cf-gutter-desktop);
}

.cf-content-container {
    width: 100%;
    max-width: var(--cf-content-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--cf-gutter-desktop);
    padding-right: var(--cf-gutter-desktop);
}

.cf-section {
    padding: var(--cf-space-80) 0;
    position: relative;
}

.cf-section--subtle {
    background-color: var(--cf-color-surface);
    border-top: 1px solid var(--cf-color-border);
    border-bottom: 1px solid var(--cf-color-border);
}

.cf-section--darker {
    background-color: var(--cf-color-ink);
}

/* 12-Column Responsive Grid System */
.cf-grid {
    display: grid;
    gap: var(--cf-grid-gap);
}

.cf-grid--12 { grid-template-columns: repeat(12, 1fr); }
.cf-grid--6  { grid-template-columns: repeat(6, 1fr); }
.cf-grid--4  { grid-template-columns: repeat(4, 1fr); }
.cf-grid--3  { grid-template-columns: repeat(3, 1fr); }
.cf-grid--2  { grid-template-columns: repeat(2, 1fr); }

.cf-col-span-12 { grid-column: span 12; }
.cf-col-span-8  { grid-column: span 8; }
.cf-col-span-6  { grid-column: span 6; }
.cf-col-span-4  { grid-column: span 4; }
.cf-col-span-3  { grid-column: span 3; }

@media (max-width: 1024px) {
    .cf-container,
    .cf-content-container {
        padding-left: var(--cf-gutter-tablet);
        padding-right: var(--cf-gutter-tablet);
    }

    .cf-grid--4,
    .cf-grid--3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .cf-col-span-8,
    .cf-col-span-6,
    .cf-col-span-4 {
        grid-column: span 12;
    }
}

@media (max-width: 768px) {
    .cf-container,
    .cf-content-container {
        padding-left: var(--cf-gutter-mobile);
        padding-right: var(--cf-gutter-mobile);
    }

    .cf-section {
        padding: var(--cf-space-48) 0;
    }

    .cf-grid--4,
    .cf-grid--3,
    .cf-grid--2 {
        grid-template-columns: 1fr;
    }
}


/* =============================================================================
 * 2. STOREFRONT HEADER & NAVIGATION
 * ========================================================================== */
.cf-topbar {
    background-color: var(--cf-color-surface-raised);
    color: var(--cf-color-text-secondary);
    font-size: var(--cf-font-size-caption);
    letter-spacing: var(--cf-letter-spacing-wide);
    text-align: center;
    padding: var(--cf-space-8) var(--cf-space-16);
    border-bottom: 1px solid var(--cf-color-border);
}

.cf-site-header {
    background-color: rgba(17, 20, 24, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--cf-color-border);
    position: sticky;
    top: 0;
    z-index: var(--cf-z-header);
    transition: background-color var(--cf-duration-fast) var(--cf-ease-out);
}

.cf-header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.cf-brand {
    display: flex;
    align-items: center;
    gap: var(--cf-space-12);
    text-decoration: none;
    color: var(--cf-color-text-primary);
}

.cf-brand__logo-mark {
    width: 34px;
    height: 34px;
    background: var(--cf-color-primary);
    color: var(--cf-color-white);
    border-radius: var(--cf-radius-sm);
    display: grid;
    place-content: center;
    font-family: var(--cf-font-sans);
    font-weight: 700;
    font-size: 14px;
    letter-spacing: -0.02em;
}

.cf-brand__text {
    font-family: var(--cf-font-sans);
    font-size: var(--cf-font-size-body);
    font-weight: var(--cf-font-weight-bold);
    letter-spacing: var(--cf-letter-spacing-tight);
}

.cf-nav-desktop .cf-menu-primary {
    display: flex;
    align-items: center;
    gap: var(--cf-space-32);
}

.cf-nav-desktop .cf-menu-primary a {
    font-size: var(--cf-font-size-body-sm);
    font-weight: var(--cf-font-weight-medium);
    color: var(--cf-color-text-secondary);
    transition: var(--cf-transition-color);
}

.cf-nav-desktop .cf-menu-primary a:hover {
    color: var(--cf-color-text-primary);
}

.cf-header-actions {
    display: flex;
    align-items: center;
    gap: var(--cf-space-12);
}

.cf-action-btn {
    width: 40px;
    height: 40px;
    display: grid;
    place-content: center;
    background: var(--cf-color-surface-raised);
    border: 1px solid var(--cf-color-border);
    border-radius: var(--cf-radius-sm);
    color: var(--cf-color-text-secondary);
    position: relative;
    transition: var(--cf-transition-color);
}

.cf-action-btn:hover {
    background: var(--cf-color-surface-elevated);
    border-color: var(--cf-color-border-strong);
    color: var(--cf-color-text-primary);
}

.cf-action-btn svg {
    width: 18px;
    height: 18px;
}

.cf-cart-count {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--cf-color-primary);
    color: #ffffff;
    font-size: 10px;
    font-weight: 700;
    min-width: 18px;
    height: 18px;
    line-height: 18px;
    text-align: center;
    border-radius: 9px;
    padding: 0 4px;
}

.cf-mobile-toggle {
    display: none;
    width: 40px;
    height: 40px;
    place-content: center;
    background: var(--cf-color-surface-raised);
    border: 1px solid var(--cf-color-border);
    border-radius: var(--cf-radius-sm);
    color: var(--cf-color-text-primary);
}

@media (max-width: 860px) {
    .cf-nav-desktop {
        display: none;
    }
    .cf-mobile-toggle {
        display: grid;
    }
}


/* =============================================================================
 * 3. MOBILE NAVIGATION DRAWER
 * ========================================================================== */
.cf-mobile-drawer {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--cf-z-drawer);
    visibility: hidden;
    transition: visibility var(--cf-duration-panel);
}

.cf-mobile-drawer.is-open {
    visibility: visible;
}

.cf-drawer-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(11, 13, 16, 0.75);
    backdrop-filter: blur(4px);
    opacity: 0;
    transition: opacity var(--cf-duration-panel) var(--cf-ease-out);
}

.cf-mobile-drawer.is-open .cf-drawer-backdrop {
    opacity: 1;
}

.cf-drawer-content {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 85%;
    max-width: 360px;
    background: var(--cf-color-surface);
    border-left: 1px solid var(--cf-color-border-strong);
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform var(--cf-duration-panel) var(--cf-ease-out);
    box-shadow: var(--cf-shadow-modal);
}

.cf-mobile-drawer.is-open .cf-drawer-content {
    transform: translateX(0);
}

.cf-drawer-header {
    padding: var(--cf-space-20);
    border-bottom: 1px solid var(--cf-color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cf-drawer-nav {
    padding: var(--cf-space-20);
    overflow-y: auto;
    flex: 1 0 auto;
}

.cf-drawer-nav ul {
    display: flex;
    flex-direction: column;
    gap: var(--cf-space-16);
}

.cf-drawer-nav a {
    font-size: var(--cf-font-size-body);
    font-weight: var(--cf-font-weight-medium);
    color: var(--cf-color-text-primary);
    display: block;
    padding: var(--cf-space-8) 0;
}


/* =============================================================================
 * 4. REUSABLE APPLICATION SHELL (Customer Portal & Admin Preview)
 * ========================================================================== */
.cf-app-shell {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: 100vh;
    background-color: var(--cf-color-ink);
}

.cf-app-sidebar {
    background-color: var(--cf-color-surface);
    border-right: 1px solid var(--cf-color-border);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
}

.cf-app-sidebar__header {
    padding: var(--cf-space-20);
    border-bottom: 1px solid var(--cf-color-border);
    display: flex;
    align-items: center;
    gap: var(--cf-space-12);
}

.cf-app-nav {
    padding: var(--cf-space-16) var(--cf-space-12);
    overflow-y: auto;
    flex: 1 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--cf-space-4);
}

.cf-app-nav__link {
    display: flex;
    align-items: center;
    gap: var(--cf-space-12);
    padding: var(--cf-space-10) var(--cf-space-12);
    border-radius: var(--cf-radius-sm);
    color: var(--cf-color-text-secondary);
    font-size: var(--cf-font-size-body-sm);
    font-weight: var(--cf-font-weight-medium);
    text-decoration: none;
    transition: var(--cf-transition-color);
}

.cf-app-nav__link:hover {
    background: var(--cf-color-surface-raised);
    color: var(--cf-color-text-primary);
}

.cf-app-nav__link.is-active {
    background: var(--cf-color-primary-soft);
    color: var(--cf-color-primary);
    font-weight: var(--cf-font-weight-semibold);
}

.cf-app-sidebar__footer {
    padding: var(--cf-space-16) var(--cf-space-20);
    border-top: 1px solid var(--cf-color-border);
    font-size: var(--cf-font-size-caption);
    color: var(--cf-color-text-muted);
}

.cf-app-main {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.cf-app-topbar {
    height: 64px;
    background: var(--cf-color-surface);
    border-bottom: 1px solid var(--cf-color-border);
    padding: 0 var(--cf-space-32);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: var(--cf-z-header);
}

.cf-app-content {
    padding: var(--cf-space-32);
    flex: 1 0 auto;
}

@media (max-width: 960px) {
    .cf-app-shell {
        grid-template-columns: 1fr;
    }
    .cf-app-sidebar {
        display: none;
    }
    .cf-app-topbar {
        padding: 0 var(--cf-space-16);
    }
    .cf-app-content {
        padding: var(--cf-space-20) var(--cf-space-16);
    }
}


/* =============================================================================
 * 5. EDITORIAL STOREFRONT FOOTER
 * ========================================================================== */
.cf-site-footer {
    background-color: var(--cf-color-surface);
    border-top: 1px solid var(--cf-color-border);
    padding: var(--cf-space-80) 0 var(--cf-space-40);
    margin-top: auto;
}

.cf-footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--cf-space-48);
    margin-bottom: var(--cf-space-64);
}

.cf-footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--cf-space-16);
}

.cf-footer-brand p {
    font-size: var(--cf-font-size-body-sm);
    color: var(--cf-color-text-secondary);
    max-width: 320px;
    line-height: var(--cf-line-height-relaxed);
}

.cf-footer-col h4 {
    font-size: var(--cf-font-size-caption);
    letter-spacing: var(--cf-letter-spacing-caps);
    text-transform: uppercase;
    color: var(--cf-color-text-muted);
    margin-bottom: var(--cf-space-16);
}

.cf-footer-col ul {
    display: flex;
    flex-direction: column;
    gap: var(--cf-space-12);
}

.cf-footer-col a {
    font-size: var(--cf-font-size-body-sm);
    color: var(--cf-color-text-secondary);
    transition: var(--cf-transition-color);
}

.cf-footer-col a:hover {
    color: var(--cf-color-text-primary);
}

.cf-footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--cf-space-32);
    border-top: 1px solid var(--cf-color-border);
    font-size: var(--cf-font-size-caption);
    color: var(--cf-color-text-muted);
    flex-wrap: wrap;
    gap: var(--cf-space-16);
}

.cf-footer-bottom a {
    color: var(--cf-color-text-secondary);
}

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

@media (max-width: 900px) {
    .cf-footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--cf-space-32);
    }
}

@media (max-width: 540px) {
    .cf-footer-grid {
        grid-template-columns: 1fr;
    }
}