@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ==========================================================================
   1. DESIGN TOKENS & CSS VARIABLES
   ========================================================================== */
:root {
    /* Typography */
    --font-primary: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    /* Fluid Font Sizes using clamp() */
    --fs-xs: clamp(0.72rem, 0.7rem + 0.15vw, 0.8rem);
    --fs-sm: clamp(0.82rem, 0.8rem + 0.2vw, 0.92rem);
    --fs-base: clamp(0.95rem, 0.92rem + 0.25vw, 1.05rem);
    --fs-md: clamp(1.1rem, 1.05rem + 0.35vw, 1.25rem);
    --fs-lg: clamp(1.25rem, 1.15rem + 0.6vw, 1.5rem);
    --fs-xl: clamp(1.5rem, 1.3rem + 1vw, 1.85rem);
    --fs-2xl: clamp(1.85rem, 1.5rem + 1.5vw, 2.35rem);
    --fs-3xl: clamp(2.2rem, 1.8rem + 2vw, 3rem);

    /* Brand Colors */
    --primary-color: #0f172a;        /* Slate 900 */
    --primary-hover: #1e293b;        /* Slate 800 */
    --brand-indigo: #4f46e5;         /* Indigo 600 */
    --brand-indigo-hover: #4338ca;   /* Indigo 700 */
    --accent-color: #3b82f6;         /* Blue 500 */
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);
    --dark-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --surface-gradient: linear-gradient(180deg, rgba(248, 250, 252, 0.8) 0%, #f8fafc 100%);

    /* Semantic States */
    --color-success: #10b981;
    --color-success-bg: #ecfdf5;
    --color-success-border: #a7f3d0;
    --color-danger: #ef4444;
    --color-danger-bg: #fef2f2;
    --color-danger-border: #fecaca;
    --color-warning: #f59e0b;
    --color-warning-bg: #fffbeb;
    --color-warning-border: #fde68a;
    --color-info: #0ea5e9;
    --color-info-bg: #f0f9ff;
    --color-info-border: #bae6fd;

    /* Neutrals */
    --bg-canvas: #f8fafc;
    --bg-surface: #ffffff;
    --border-subtle: #e2e8f0;
    --border-focus: #6366f1;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-light: #94a3b8;

    /* Spacing System */
    --space-1: 0.25rem;  /* 4px */
    --space-2: 0.5rem;   /* 8px */
    --space-3: 0.75rem;  /* 12px */
    --space-4: 1rem;     /* 16px */
    --space-5: 1.5rem;   /* 24px */
    --space-6: 2rem;     /* 32px */
    --space-7: 2.5rem;   /* 40px */
    --space-8: 3rem;     /* 48px */
    --section-py: clamp(2.5rem, 5vw, 5rem);

    /* Elevation & Shadows */
    --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
    --hover-shadow: 0 16px 32px -4px rgba(15, 23, 42, 0.12);
    --dropdown-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
    --focus-ring: 0 0 0 4px rgba(79, 70, 229, 0.15);

    /* Radii */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.25rem;
    --radius-pill: 9999px;

    /* Smooth Transitions */
    --transition-snappy: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   2. BASE & FLUID TYPOGRAPHY
   ========================================================================== */
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-canvas);
    color: #334155;
    line-height: 1.6;
    overflow-x: hidden;
    padding-bottom: env(safe-area-inset-bottom, 0);
}

h1, .h1 { font-size: var(--fs-3xl); font-weight: 800; letter-spacing: -0.03em; line-height: 1.15; color: var(--text-main); }
h2, .h2 { font-size: var(--fs-2xl); font-weight: 700; letter-spacing: -0.025em; line-height: 1.2; color: var(--text-main); }
h3, .h3 { font-size: var(--fs-xl); font-weight: 700; letter-spacing: -0.02em; line-height: 1.25; color: var(--text-main); }
h4, .h4 { font-size: var(--fs-lg); font-weight: 600; letter-spacing: -0.015em; line-height: 1.3; color: var(--text-main); }
h5, .h5 { font-size: var(--fs-md); font-weight: 600; line-height: 1.35; color: var(--text-main); }
h6, .h6 { font-size: var(--fs-base); font-weight: 600; line-height: 1.4; color: var(--text-main); }

p { margin-bottom: 1rem; }
.small, small { font-size: var(--fs-sm); }
.extra-small { font-size: var(--fs-xs); }

/* Text Clamping Utilities */
.line-clamp-1 {
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.line-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ==========================================================================
   3. BUTTONS & TOUCH TARGETS
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 600;
    min-height: 44px; /* Accessible touch target */
    border-radius: var(--radius-md);
    transition: var(--transition-snappy);
    text-decoration: none;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background-color: var(--brand-indigo);
    border-color: var(--brand-indigo);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.btn-primary:hover, .btn-primary:focus {
    background-color: var(--brand-indigo-hover);
    border-color: var(--brand-indigo-hover);
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
}

.btn-dark {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #ffffff;
}

.btn-dark:hover, .btn-dark:focus {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
    color: #ffffff;
    transform: translateY(-1px);
}

.btn-gradient {
    background: var(--accent-gradient);
    color: #ffffff;
    border: none;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.25);
}

.btn-gradient:hover {
    color: #ffffff;
    opacity: 0.95;
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(59, 130, 246, 0.35);
}

.btn-outline-secondary {
    border-color: #cbd5e1;
    color: #475569;
}

.btn-outline-secondary:hover {
    background-color: #f1f5f9;
    border-color: #94a3b8;
    color: #0f172a;
}

/* Button Loading State */
.btn.is-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.8;
}

.btn.is-loading .btn-text-content {
    visibility: hidden;
}

.btn.is-loading::after {
    content: "";
    position: absolute;
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: btnSpinner 0.75s linear infinite;
}

@keyframes btnSpinner {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Mobile Full Width Button Utility */
@media (max-width: 767.98px) {
    .btn-mobile-full {
        width: 100% !important;
    }
}

/* ==========================================================================
   4. FORMS & INPUTS (TOUCH FRIENDLY)
   ========================================================================== */
.form-control, .form-select {
    min-height: 48px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-subtle);
    padding: 0.65rem 1rem;
    font-size: var(--fs-base);
    color: var(--text-main);
    background-color: #ffffff;
    transition: var(--transition-snappy);
}

.form-control:focus, .form-select:focus {
    border-color: var(--border-focus);
    box-shadow: var(--focus-ring);
    outline: none;
}

.form-label {
    font-size: var(--fs-sm);
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.4rem;
}

/* Form Invalid State */
.form-control.is-invalid, .form-select.is-invalid {
    border-color: var(--color-danger);
    background-image: none;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.invalid-feedback {
    font-size: var(--fs-xs);
    font-weight: 500;
    color: var(--color-danger);
    display: flex;
    align-items: center;
    gap: 0.25rem;
    margin-top: 0.35rem;
}

/* ==========================================================================
   5. ALERTS & NOTIFICATIONS
   ========================================================================== */
.alert {
    border-radius: var(--radius-lg);
    padding: 1rem 1.25rem;
    border: 1px solid transparent;
    font-size: var(--fs-sm);
    box-shadow: var(--card-shadow);
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.alert-success {
    background-color: var(--color-success-bg);
    border-color: var(--color-success-border);
    color: #065f46;
}

.alert-danger {
    background-color: var(--color-danger-bg);
    border-color: var(--color-danger-border);
    color: #991b1b;
}

.alert-warning {
    background-color: var(--color-warning-bg);
    border-color: var(--color-warning-border);
    color: #92400e;
}

.alert-info {
    background-color: var(--color-info-bg);
    border-color: var(--color-info-border);
    color: #075985;
}

/* Toast Container System */
.store-toast-container {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 1090;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-width: 380px;
    width: calc(100% - 3rem);
    pointer-events: none;
}

.store-toast {
    pointer-events: auto;
    background: #ffffff;
    border-radius: var(--radius-lg);
    box-shadow: var(--hover-shadow);
    border: 1px solid var(--border-subtle);
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: toastSlideIn 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    transition: var(--transition-smooth);
}

.store-toast.hide {
    opacity: 0;
    transform: translateY(-10px);
}

@keyframes toastSlideIn {
    from { opacity: 0; transform: translateY(-15px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ==========================================================================
   6. EMPTY STATE COMPONENT
   ========================================================================== */
.empty-state {
    text-align: center;
    padding: clamp(2.5rem, 6vw, 4.5rem) 1.5rem;
    background: #ffffff;
    border-radius: var(--radius-xl);
    border: 1px dashed var(--border-subtle);
    box-shadow: var(--card-shadow);
}

.empty-state-icon {
    width: clamp(70px, 12vw, 96px);
    height: clamp(70px, 12vw, 96px);
    margin: 0 auto 1.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(2rem, 4vw, 2.75rem);
    background: radial-gradient(circle, rgba(79, 70, 229, 0.1) 0%, rgba(248, 250, 252, 0.5) 100%);
    color: var(--brand-indigo);
    box-shadow: 0 8px 20px -4px rgba(79, 70, 229, 0.15);
    animation: emptyFloat 3s ease-in-out infinite alternate;
}

.empty-state-icon.danger {
    background: radial-gradient(circle, rgba(239, 68, 68, 0.1) 0%, rgba(248, 250, 252, 0.5) 100%);
    color: var(--color-danger);
    box-shadow: 0 8px 20px -4px rgba(239, 68, 68, 0.15);
}

@keyframes emptyFloat {
    from { transform: translateY(0); }
    to { transform: translateY(-6px); }
}

.empty-state-title {
    font-size: var(--fs-lg);
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.empty-state-text {
    font-size: var(--fs-sm);
    color: var(--text-muted);
    max-width: 440px;
    margin: 0 auto 1.75rem;
}

/* ==========================================================================
   7. SKELETON LOADING PLACEHOLDERS
   ========================================================================== */
.skeleton {
    background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 37%, #f1f5f9 63%);
    background-size: 400% 100%;
    animation: skeletonShimmer 1.4s ease infinite;
    border-radius: var(--radius-sm);
}

.skeleton-text {
    height: 1rem;
    margin-bottom: 0.5rem;
    border-radius: 4px;
}

.skeleton-card {
    height: 280px;
    border-radius: var(--radius-lg);
}

@keyframes skeletonShimmer {
    0% { background-position: 100% 50%; }
    100% { background-position: 0 50%; }
}

/* ==========================================================================
   8. NAVIGATION & APP BAR (MOBILE & DESKTOP)
   ========================================================================== */
.navbar {
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    background: rgba(255, 255, 255, 0.92) !important;
    border-bottom: 1px solid rgba(226, 232, 240, 0.85);
    transition: var(--transition-snappy);
}

.navbar-brand {
    font-size: clamp(1.2rem, 1rem + 0.8vw, 1.5rem);
    letter-spacing: -0.025em;
}

.nav-link {
    font-size: var(--fs-sm);
    font-weight: 600;
    color: #475569;
    padding: 0.5rem 0.85rem;
    border-radius: var(--radius-md);
    transition: var(--transition-snappy);
}

.nav-link:hover, .nav-link.active {
    color: var(--brand-indigo) !important;
    background-color: rgba(79, 70, 229, 0.05);
}

/* Mobile Bottom App Navigation Bar (< 992px) */
.mobile-bottom-nav {
    display: none;
}

@media (max-width: 991.98px) {
    body {
        padding-bottom: 74px !important; /* Prevent footer clipping */
    }

    .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: 64px;
        background: rgba(255, 255, 255, 0.96);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-top: 1px solid var(--border-subtle);
        box-shadow: 0 -4px 20px rgba(15, 23, 42, 0.08);
        z-index: 1040;
        justify-content: space-around;
        align-items: center;
        padding-bottom: env(safe-area-inset-bottom, 0);
    }

    .mobile-nav-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        flex: 1;
        height: 100%;
        color: var(--text-muted);
        text-decoration: none;
        font-size: 0.68rem;
        font-weight: 600;
        gap: 2px;
        position: relative;
        transition: color 0.2s ease;
    }

    .mobile-nav-item i {
        font-size: 1.25rem;
        transition: transform 0.2s ease;
    }

    .mobile-nav-item.active, .mobile-nav-item:active {
        color: var(--brand-indigo);
    }

    .mobile-nav-item.active i {
        transform: translateY(-1px);
    }

    .mobile-nav-badge {
        position: absolute;
        top: 6px;
        right: calc(50% - 16px);
        font-size: 0.65rem;
        padding: 0.15rem 0.35rem;
        line-height: 1;
    }
}

/* ==========================================================================
   9. CARDS & PRODUCT GRIDS
   ========================================================================== */
.card {
    border-radius: var(--radius-lg) !important;
    border: 1px solid var(--border-subtle);
    box-shadow: var(--card-shadow);
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.hover-lift {
    transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--hover-shadow) !important;
}

.product-card {
    overflow: hidden;
    background: #ffffff;
}

.product-image {
    transition: transform 0.3s ease;
}

.product-card:hover .product-image {
    transform: scale(1.03);
}

/* Responsive Table Wrapper */
.table-responsive-card {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-lg);
}

.table-responsive-card::-webkit-scrollbar {
    height: 6px;
}
.table-responsive-card::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

/* ==========================================================================
   10. ADMIN RESPONSIVE DRAWER & LAYOUT (< 992px)
   ========================================================================== */
@media (max-width: 991.98px) {
    .admin-sidebar {
        position: fixed;
        top: 0;
        bottom: 0;
        left: -280px;
        width: 270px;
        z-index: 1060;
        transition: left 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        overflow-y: auto;
    }

    .admin-sidebar.show {
        left: 0;
    }

    .admin-backdrop {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(15, 23, 42, 0.6);
        backdrop-filter: blur(4px);
        z-index: 1055;
    }

    .admin-backdrop.show {
        display: block;
    }
}

/* ==========================================================================
   11. SOCIAL MEDIA ICONS & HOVER EFFECTS
   ========================================================================== */
.social-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    text-decoration: none;
    font-size: 15px;
}
.social-icon-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.18);
}
.social-icon-btn.social-twitter:hover { background-color: #000000 !important; color: #ffffff !important; border-color: #000000 !important; }
.social-icon-btn.social-facebook:hover { background-color: #1877F2 !important; color: #ffffff !important; border-color: #1877F2 !important; }
.social-icon-btn.social-instagram:hover { background: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888) !important; color: #ffffff !important; border-color: transparent !important; }
.social-icon-btn.social-github:hover { background-color: #24292e !important; color: #ffffff !important; border-color: #24292e !important; }
.social-icon-btn.social-youtube:hover { background-color: #FF0000 !important; color: #ffffff !important; border-color: #FF0000 !important; }
.social-icon-btn.social-linkedin:hover { background-color: #0A66C2 !important; color: #ffffff !important; border-color: #0A66C2 !important; }
.social-icon-btn.social-discord:hover { background-color: #5865F2 !important; color: #ffffff !important; border-color: #5865F2 !important; }

.social-pill-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    text-decoration: none;
}
.social-pill-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(15, 23, 42, 0.08);
}