/*
 * ==========================================================================
 * SHEET COMPONENT - Unified Slide-in Panel
 * ==========================================================================
 * A reusable slide-in panel component from the right side.
 * Supports multiple variants: forms, notifications, and custom content.
 *
 * Architecture:
 * - Base sheet styles (overlay, panel, animation)
 * - Structural sections (header, content, footer)
 * - Variant-specific styles (form, notification)
 *
 * Usage:
 *   <div class="sheet">
 *     <div class="sheet-overlay"></div>
 *     <div class="sheet-panel">
 *       <div class="sheet-header">...</div>
 *       <div class="sheet-content">...</div>
 *       <div class="sheet-footer">...</div>
 *     </div>
 *   </div>
 * ==========================================================================
 */

/* ========================================
   SHEET CONTAINER
   Base container with visibility control
   ======================================== */

.sheet {
    visibility: hidden;
    pointer-events: none;
    /* Delay visibility:hidden until after slide-out animation (0.3s) */
    transition: visibility 0s linear 0.3s;
}

.sheet.active,
.sheet.open {
    visibility: visible;
    pointer-events: auto;
    /* When opening, show immediately (no delay) */
    transition: visibility 0s linear 0s;
}

/* ========================================
   OVERLAY / BACKDROP
   Shared overlay for all sheet variants
   ======================================== */

.sheet-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-overlay, rgba(44, 40, 37, 0.4));
    backdrop-filter: blur(0.25rem);
    -webkit-backdrop-filter: blur(0.25rem);
    z-index: 200;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.sheet.active .sheet-overlay,
.sheet.open .sheet-overlay {
    opacity: 1;
}

/* ========================================
   SHEET PANEL
   Main sliding panel - base styles
   ======================================== */

.sheet-panel {
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    background: var(--bg-card);
    z-index: 201;
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sheet.active .sheet-panel,
.sheet.open .sheet-panel {
    transform: translateX(0);
}

/* Panel width variants */
.sheet-panel-sm {
    width: 23.75rem;
    max-width: 100vw;
}

.sheet-panel-md {
    width: 28.125rem;
    max-width: 100vw;
}

.sheet-panel-lg {
    width: 37.5rem;
    max-width: 100vw;
}

/* Panel shadow */
.sheet.active .sheet-panel,
.sheet.open .sheet-panel {
    box-shadow: -0.5rem 0 2rem rgba(44, 40, 37, 0.12);
}

/* Border for form variant */
.sheet-form .sheet-panel {
    border-left: 1px solid var(--border);
}

/* ========================================
   SHEET HEADER
   Consistent header across all variants
   ======================================== */

.sheet-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    min-height: 4rem;
}

/* Header background variants */
.sheet-form .sheet-header {
    background: var(--bg-base);
}

.sheet-notification .sheet-header {
    background: var(--bg-card);
}

/* Header title */
.sheet-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.3;
}

/* Header actions area (right side) */
.sheet-header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Close button - shared across variants */
.sheet-close {
    width: 2.25rem;
    height: 2.25rem;
    border-radius: var(--radius-md);
    border: none;
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.sheet-close:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.sheet-close:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 0.125rem;
}

.sheet-close svg {
    width: 1.25rem;
    height: 1.25rem;
}

/* ========================================
   SHEET CONTENT
   Scrollable content area
   ======================================== */

.sheet-content {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
}

/* Form variant: extra padding bottom for fixed footer */
.sheet-form .sheet-content {
    padding-bottom: 6.25rem;
}

/* Notification variant: minimal padding */
.sheet-notification .sheet-content {
    padding: 0.5rem;
}

/* Scrollbar styling */
.sheet-content::-webkit-scrollbar {
    width: 0.375rem;
}

.sheet-content::-webkit-scrollbar-track {
    background: transparent;
}

.sheet-content::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 0.1875rem;
}

.sheet-content::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ========================================
   SHEET FOOTER
   Optional footer for actions
   ======================================== */

.sheet-footer {
    flex-shrink: 0;
    margin-top: auto;
}

/* Footer background variants */
.sheet-form .sheet-footer {
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border);
    background: var(--bg-base);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.75rem;
}

/* When footer is inside content (within forms) - fixed at bottom */
.sheet-form .sheet-content .sheet-footer {
    position: fixed;
    bottom: 0;
    right: 0;
    width: 28.125rem;
    margin: 0;
    padding: 1.25rem 1.5rem;
    background: var(--bg-base);
    border-top: 1px solid var(--border);
    z-index: 202;
    box-sizing: border-box;
}

.sheet-notification .sheet-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border);
    background: var(--bg-card);
}

/* ==========================================================================
   FORM VARIANT STYLES
   Specific to form sheets
   ========================================================================== */

/* Form groups within sheet */
.sheet-form .sheet-content .form-group {
    margin-bottom: 1.25rem;
}

.sheet-form .sheet-content .form-group:last-of-type {
    margin-bottom: 0;
}

/* Form section divider */
.sheet-form .sheet-content .form-divider {
    margin: 1.5rem 0;
    border: none;
    border-top: 1px solid var(--border-light);
}

/* Form section title */
.sheet-form .sheet-content .form-section-title {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-light);
}

/* Error state */
.sheet-error {
    padding: 0.75rem 1rem;
    margin-bottom: 1.25rem;
    background: var(--status-error-light);
    border: 1px solid var(--status-error);
    border-radius: var(--radius-md);
    color: var(--status-error);
    font-size: 0.875rem;
    display: none;
}

.sheet-error.visible {
    display: block;
}

.sheet-error svg {
    width: 1rem;
    height: 1rem;
    margin-right: 0.5rem;
    vertical-align: middle;
}

/* Loading state */
.sheet-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3.75rem 1.5rem;
    color: var(--text-muted);
}

.sheet-loading::after {
    content: '';
    width: 1.5rem;
    height: 1.5rem;
    border: 2px solid var(--border);
    border-top-color: var(--accent-primary);
    border-radius: var(--radius-round);
    animation: sheet-spin 0.6s linear infinite;
}

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

/* ==========================================================================
   NOTIFICATION VARIANT STYLES
   Specific to notification sheets
   ========================================================================== */

/* Filter tabs in header area */
.sheet-tabs {
    display: flex;
    gap: 0.25rem;
    padding: 0.75rem 1.5rem;
    border-bottom: 1px solid var(--border-light);
    background: var(--bg-base);
    flex-shrink: 0;
}

.sheet-tab {
    flex: 1;
    padding: 0.625rem 1rem;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.sheet-tab:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.sheet-tab.active {
    background: var(--bg-card);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

/* Mark all read button */
.sheet-mark-all {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.sheet-mark-all:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.sheet-mark-all svg {
    width: 1rem;
    height: 1rem;
}

/* Notification list */
.sheet-list {
    flex: 1;
    overflow-y: auto;
}

/* Loading state for notifications */
.sheet-list-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 1.5rem;
    gap: 1rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.sheet-list-loading .sheet-spinner {
    width: 2rem;
    height: 2rem;
    border: 3px solid var(--border);
    border-top-color: var(--accent-terracotta);
    border-radius: var(--radius-round);
    animation: sheet-spin 0.8s linear infinite;
}

/* Empty state */
.sheet-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 1.5rem;
    text-align: center;
}

.sheet-empty-icon {
    width: 4rem;
    height: 4rem;
    border-radius: var(--radius-round);
    background: var(--bg-base);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: var(--text-muted);
}

.sheet-empty-icon svg {
    width: 2rem;
    height: 2rem;
}

.sheet-empty h3 {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-primary);
    margin: 0 0 0.25rem;
}

.sheet-empty p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin: 0;
}

/* Notification card */
.sheet-card {
    display: flex;
    gap: 0.875rem;
    padding: 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    text-decoration: none;
    color: inherit;
    margin-bottom: 0.25rem;
}

.sheet-card:hover {
    background: var(--bg-base);
}

.sheet-card:last-child {
    margin-bottom: 0;
}

/* Unread indicator */
.sheet-card.unread::before {
    content: '';
    position: absolute;
    left: 0.375rem;
    top: 50%;
    transform: translateY(-50%);
    width: 0.375rem;
    height: 0.375rem;
    background: var(--accent-terracotta);
    border-radius: var(--radius-round);
}

.sheet-card.unread {
    background: var(--accent-terracotta-light);
}

.sheet-card.unread:hover {
    background: rgba(196, 101, 74, 0.08);
}

/* Notification icon */
.sheet-card-icon {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.sheet-card-icon svg {
    width: 1.25rem;
    height: 1.25rem;
}

/* Icon variants */
.sheet-card-icon.alert {
    background: var(--accent-terracotta-light);
    color: var(--accent-terracotta);
}

.sheet-card-icon.success {
    background: var(--accent-sage-light);
    color: var(--accent-sage);
}

.sheet-card-icon.info {
    background: var(--accent-navy-light);
    color: var(--accent-navy);
}

.sheet-card-icon.warning {
    background: var(--accent-amber-light);
    color: var(--accent-amber);
}

.sheet-card-icon.client {
    background: #E8F4F4;
    color: #0D6B6E;
}

.sheet-card-icon.quote {
    background: var(--accent-sage-light);
    color: var(--accent-sage);
}

.sheet-card-icon.system {
    background: #F3EEF6;
    color: var(--accent-plum);
}

/* Card content */
.sheet-card-content {
    flex: 1;
    min-width: 0;
}

.sheet-card-title {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    margin: 0 0 0.25rem;
    line-height: 1.3;
}

.sheet-card-message {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.sheet-card-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* Dismiss button */
.sheet-card-dismiss {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    width: 1.75rem;
    height: 1.75rem;
    border-radius: var(--radius-sm);
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all 0.2s ease;
}

.sheet-card:hover .sheet-card-dismiss {
    opacity: 1;
}

.sheet-card-dismiss:hover {
    background: var(--border);
    color: var(--text-primary);
}

.sheet-card-dismiss svg {
    width: 0.875rem;
    height: 0.875rem;
}

/* View all link in footer */
.sheet-view-all {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-card);
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.sheet-view-all:hover {
    background: var(--bg-base);
    color: var(--text-primary);
}

.sheet-view-all svg {
    width: 1rem;
    height: 1rem;
}

/* Bell badge (for trigger button) */
.sheet-badge {
    position: absolute;
    top: 0.25rem;
    right: 0.25rem;
    min-width: 1.125rem;
    height: 1.125rem;
    padding: 0 0.3125rem;
    border-radius: var(--radius-full);
    background: var(--accent-terracotta);
    color: white;
    font-size: 0.6875rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--bg-card);
    line-height: 1;
}

.sheet-badge.hidden {
    display: none;
}

/* Drag handle for mobile sheet (hidden by default, shown on mobile) */
.sheet-drag-handle {
    display: none; /* shown on mobile via media query */
    width: 3rem;
    height: 0.25rem;
    background: var(--border);
    border-radius: 9999px;
    margin: 0.75rem auto 0;
}

/* ==========================================================================
   RESPONSIVE - TABLET / MOBILE (768px)
   ========================================================================== */

@media (max-width: 768px) {
    .sheet-panel {
        width: 100vw;
        height: 100vh;
        max-width: 100vw;
        top: auto;
        bottom: 0;
        right: 0;
        transform: translateY(100%);
        border-radius: var(--radius-lg, 0.75rem) var(--radius-lg, 0.75rem) 0 0;
    }

    .sheet.open .sheet-panel,
    .sheet.active .sheet-panel {
        transform: translateY(0);
    }

    .sheet-drag-handle {
        display: block;
    }
}

/* ==========================================================================
   RESPONSIVE - SMALL MOBILE
   ========================================================================== */

@media (max-width: 480px) {
    /* Full width on mobile */
    .sheet-panel-sm,
    .sheet-panel-md,
    .sheet-panel-lg {
        width: 100vw;
    }

    .sheet-form .sheet-panel {
        border-left: none;
    }

    /* Compact header */
    .sheet-header {
        padding: 1rem 1.25rem;
    }

    .sheet-title {
        font-size: 1.125rem;
    }

    /* Compact content */
    .sheet-content {
        padding: 1.25rem;
    }

    /* Footer adjustments */
    .sheet-form .sheet-content .sheet-footer {
        width: 100vw;
        margin: 1.25rem -1.25rem -1.25rem -1.25rem;
        padding: 1rem 1.25rem;
    }

    .sheet-footer {
        padding: 1rem 1.25rem;
    }

    /* Stack buttons vertically on mobile */
    .sheet-form .sheet-footer {
        flex-direction: column-reverse;
    }

    .sheet-form .sheet-footer .btn,
    .sheet-form .sheet-footer .btn-primary,
    .sheet-form .sheet-footer .btn-secondary {
        width: 100%;
    }

    /* Notification specific mobile adjustments */
    .sheet-tabs {
        padding: 0.75rem 1rem;
    }

    .sheet-list {
        padding: 0.25rem;
    }

    .sheet-card {
        padding: 0.75rem;
    }

    .sheet-footer {
        padding: 0.75rem 1rem;
    }

    .sheet-mark-all span {
        display: none;
    }

    .sheet-mark-all {
        padding: 0.5rem;
    }
}

/* ==========================================================================
   ACCESSIBILITY
   ========================================================================== */

/* Focus visible for keyboard navigation */
.sheet-close:focus-visible,
.sheet-tab:focus-visible,
.sheet-card:focus-visible,
.sheet-mark-all:focus-visible,
.sheet-card-dismiss:focus-visible,
.sheet-view-all:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 0.125rem;
}

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
    .sheet-overlay,
    .sheet-panel,
    .sheet-card,
    .sheet-spinner,
    .sheet-loading::after {
        transition: none !important;
        animation: none !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .sheet-form .sheet-panel {
        border-left-width: 2px;
    }

    .sheet-header,
    .sheet-footer {
        border-width: 2px;
    }

    .sheet-card.unread::before {
        width: 0.5rem;
        height: 0.5rem;
    }
}