/* ==========================================================================
   No404 Marketing - Global Design System
   Version: 2.0
   Description: Modern, professional SaaS-style design system
   ========================================================================== */

/* ==========================================================================
   1. CSS Custom Properties (Design Tokens)
   ========================================================================== */

:root {
    /* Brand Colors */
    --color-primary: #0072ff;
    --color-primary-dark: #0059cc;
    --color-primary-light: #e6f0ff;
    --color-primary-hover: #0065e6;

    --color-secondary: #00c6ff;
    --color-secondary-dark: #00a6d6;
    --color-secondary-light: #e6faff;

    --color-accent: #ff7a00;
    --color-accent-dark: #e66d00;
    --color-accent-light: #fff5eb;
    --color-accent-hover: #ff8c1a;

    /* Neutral Colors */
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    /* Semantic Colors */
    --color-success: #10b981;
    --color-success-light: #d1fae5;
    --color-success-dark: #059669;

    --color-warning: #f59e0b;
    --color-warning-light: #fef3c7;
    --color-warning-dark: #d97706;

    --color-error: #ef4444;
    --color-error-light: #fee2e2;
    --color-error-dark: #dc2626;

    --color-info: #3b82f6;
    --color-info-light: #dbeafe;
    --color-info-dark: #2563eb;

    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;

    /* Text Colors */
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-tertiary: #6b7280;
    --text-muted: #9ca3af;
    --text-inverse: #ffffff;

    /* Border Colors */
    --border-light: #e5e7eb;
    --border-default: #d1d5db;
    --border-dark: #9ca3af;

    /* Typography Scale */
    --font-family-base: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-heading: var(--font-family-base);
    --font-family-mono: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;

    /* Font Sizes */
    --text-xs: 0.75rem;      /* 12px */
    --text-sm: 0.875rem;     /* 14px */
    --text-base: 1rem;       /* 16px */
    --text-lg: 1.125rem;     /* 18px */
    --text-xl: 1.25rem;      /* 20px */
    --text-2xl: 1.5rem;      /* 24px */
    --text-3xl: 1.875rem;    /* 30px */
    --text-4xl: 2.25rem;     /* 36px */
    --text-5xl: 3rem;        /* 48px */
    --text-6xl: 3.75rem;     /* 60px */

    /* Font Weights */
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;

    /* Line Heights */
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;

    /* Letter Spacing */
    --tracking-tight: -0.025em;
    --tracking-normal: 0;
    --tracking-wide: 0.025em;

    /* Spacing Scale */
    --space-0: 0;
    --space-1: 0.25rem;      /* 4px */
    --space-2: 0.5rem;       /* 8px */
    --space-3: 0.75rem;      /* 12px */
    --space-4: 1rem;         /* 16px */
    --space-5: 1.25rem;      /* 20px */
    --space-6: 1.5rem;       /* 24px */
    --space-8: 2rem;         /* 32px */
    --space-10: 2.5rem;      /* 40px */
    --space-12: 3rem;        /* 48px */
    --space-16: 4rem;        /* 64px */
    --space-20: 5rem;        /* 80px */
    --space-24: 6rem;        /* 96px */

    /* Border Radius */
    --radius-sm: 0.25rem;    /* 4px */
    --radius-md: 0.375rem;   /* 6px */
    --radius-lg: 0.5rem;     /* 8px */
    --radius-xl: 0.75rem;    /* 12px */
    --radius-2xl: 1rem;      /* 16px */
    --radius-3xl: 1.5rem;    /* 24px */
    --radius-full: 9999px;

    /* Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Focus ring */
    --ring-color: rgba(0, 114, 255, 0.5);
    --ring-offset: 2px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Z-index scale */
    --z-dropdown: 1000;
    --z-sticky: 1100;
    --z-fixed: 1200;
    --z-modal-backdrop: 1300;
    --z-modal: 1400;
    --z-popover: 1500;
    --z-tooltip: 1600;

    /* Container widths */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1536px;

    /* Legacy variable support for existing code */
    --main-black: #111827;
    --main-orange: #ff7a00;
    --main-blue: #0072ff;
    --main-blue-light: #00c6ff;
    --main-white: #ffffff;
    --main-gray: #f9fafb;
}

/* ==========================================================================
   2. CSS Reset & Base Styles
   ========================================================================== */

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--text-base);
    font-weight: var(--font-normal);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    min-height: 100vh;
}

/* ==========================================================================
   3. Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

h1, .h1 {
    font-size: var(--text-4xl);
    letter-spacing: var(--tracking-tight);
}

h2, .h2 {
    font-size: var(--text-3xl);
    letter-spacing: var(--tracking-tight);
}

h3, .h3 {
    font-size: var(--text-2xl);
}

h4, .h4 {
    font-size: var(--text-xl);
}

h5, .h5 {
    font-size: var(--text-lg);
}

h6, .h6 {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
}

p {
    margin-bottom: var(--space-4);
    color: var(--text-secondary);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
}

a:focus-visible {
    outline: 2px solid var(--ring-color);
    outline-offset: var(--ring-offset);
    border-radius: var(--radius-sm);
}

strong, b {
    font-weight: var(--font-semibold);
}

small {
    font-size: var(--text-sm);
}

code {
    font-family: var(--font-family-mono);
    font-size: 0.875em;
    padding: 0.125rem 0.375rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--color-accent);
}

/* ==========================================================================
   4. Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-family: var(--font-family-base);
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    line-height: 1;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn:focus-visible {
    outline: 2px solid var(--ring-color);
    outline-offset: var(--ring-offset);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Primary Button */
.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: var(--text-inverse);
    border-color: transparent;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--text-inverse);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

/* Secondary Button */
.btn-secondary {
    background: var(--bg-primary);
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-primary);
    color: var(--text-inverse);
}

/* Tertiary/Ghost Button */
.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border-color: var(--border-default);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--bg-tertiary);
    border-color: var(--border-dark);
    color: var(--text-primary);
}

/* Accent Button */
.btn-accent {
    background: var(--color-accent);
    color: var(--text-inverse);
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
}

.btn-accent:hover:not(:disabled) {
    background: var(--color-accent-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--text-inverse);
}

/* Danger Button */
.btn-danger {
    background: var(--color-error);
    color: var(--text-inverse);
    border-color: var(--color-error);
}

.btn-danger:hover:not(:disabled) {
    background: var(--color-error-dark);
    color: var(--text-inverse);
}

/* Button Sizes */
.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-sm);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
}

.btn-icon {
    padding: var(--space-3);
}

.btn-full {
    width: 100%;
}

/* ==========================================================================
   5. Form Elements
   ========================================================================== */

.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--text-primary);
}

.form-label-required::after {
    content: " *";
    color: var(--color-error);
}

.form-input,
.form-select,
.form-textarea {
    display: block;
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-family-base);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    border: 2px solid var(--border-default);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
    border-color: var(--border-dark);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-muted);
}

.form-input-error {
    border-color: var(--color-error);
}

.form-input-error:focus {
    box-shadow: 0 0 0 3px var(--color-error-light);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right var(--space-3) center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: var(--space-12);
}

.form-hint {
    margin-top: var(--space-1);
    font-size: var(--text-sm);
    color: var(--text-tertiary);
}

.form-error {
    margin-top: var(--space-1);
    font-size: var(--text-sm);
    color: var(--color-error);
}

/* ==========================================================================
   6. Cards
   ========================================================================== */

.card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.card-header {
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--border-light);
}

.card-body {
    padding: var(--space-6);
}

.card-footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--border-light);
    background: var(--bg-secondary);
}

.card-title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

.card-subtitle {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
}

/* Elevated Card */
.card-elevated {
    border: none;
    box-shadow: var(--shadow-lg);
}

/* Interactive Card */
.card-interactive {
    cursor: pointer;
    transition: all var(--transition-base);
}

.card-interactive:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* ==========================================================================
   7. Navigation
   ========================================================================== */

.nav-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    background: linear-gradient(135deg, var(--color-gray-900) 0%, var(--color-primary) 100%);
    box-shadow: var(--shadow-lg);
}

.nav-container {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.nav-logo img {
    height: 70px;
    width: 70px;
    border-radius: var(--radius-full);
    border: 3px solid var(--color-primary);
    padding: 4px;
    background: var(--color-gray-900);
    box-shadow: var(--shadow-md);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    list-style: none;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    color: var(--text-inverse);
    font-weight: var(--font-medium);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-inverse);
}

.nav-cta {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
    border: 2px solid var(--color-accent);
    padding: var(--space-2) var(--space-5);
    border-radius: var(--radius-full);
    font-weight: var(--font-semibold);
}

.nav-cta:hover {
    background: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 122, 0, 0.4);
}

/* Mobile Navigation */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: var(--space-2);
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-inverse);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: linear-gradient(180deg, var(--color-gray-900) 0%, var(--color-primary) 100%);
        padding: var(--space-6);
        gap: var(--space-2);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        width: 100%;
        justify-content: center;
        padding: var(--space-4);
    }
}

/* Brand Logo */
.brand-logo {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.brand-logo:hover {
    text-decoration: none;
}

.brand-logo__icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast);
}

.brand-logo:hover .brand-logo__icon {
    transform: scale(1.05);
}

.brand-logo__text {
    font-family: var(--font-family-base);
    font-weight: var(--font-bold);
    font-size: var(--text-lg);
    color: var(--text-inverse);
    letter-spacing: -0.01em;
}

/* Light header variant */
.header--light .brand-logo__text,
.brand-logo--dark .brand-logo__text {
    color: var(--text-primary);
}

/* Site Header (Marketing Pages) */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    background: linear-gradient(135deg, var(--color-gray-900) 0%, rgba(0, 114, 255, 0.95) 100%);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-lg);
}

.header-container {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.header-logo {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
}

.header-logo img {
    height: 44px;
    width: 44px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast);
}

.header-logo:hover img {
    transform: scale(1.05);
}

.header-logo span {
    font-family: var(--font-family-base);
    font-weight: var(--font-bold);
    font-size: var(--text-lg);
    color: var(--text-inverse);
}

.header-nav {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* Desktop Nav Menu */
.header-nav .nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    list-style: none;
    margin: 0;
    padding: 0;
}

.header-nav .nav-menu a {
    display: flex;
    align-items: center;
    padding: var(--space-3) var(--space-4);
    color: #ffffff;
    font-weight: var(--font-medium);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.header-nav .nav-menu a:hover,
.header-nav .nav-menu a:focus {
    background: rgba(255, 255, 255, 0.15);
    color: #ffffff;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-inverse);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

@media (max-width: 900px) {
    .mobile-menu-btn {
        display: flex;
    }

    .header-nav .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: linear-gradient(180deg, var(--color-gray-900) 0%, var(--color-primary) 100%);
        padding: var(--space-6);
        gap: var(--space-2);
        transform: translateY(-150%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
        box-shadow: var(--shadow-xl);
    }

    .header-nav .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .header-nav .nav-menu a {
        width: 100%;
        justify-content: center;
        padding: var(--space-4);
        color: var(--text-inverse);
        text-decoration: none;
        border-radius: var(--radius-lg);
        transition: background var(--transition-fast);
    }

    .header-nav .nav-menu a:hover {
        background: rgba(255, 255, 255, 0.1);
    }
}

/* Site Footer */
.site-footer {
    background: linear-gradient(135deg, var(--color-gray-900) 0%, var(--color-primary) 100%);
    color: var(--text-inverse);
    padding: var(--space-12) 0;
}

.footer-container {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-12);
    justify-content: space-between;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.footer-brand img {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
    margin: 0;
}

.footer-links {
    display: flex;
    gap: var(--space-16);
    flex-wrap: wrap;
}

.footer-column h4 {
    color: var(--text-inverse);
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-4);
}

.footer-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-column li {
    margin-bottom: var(--space-2);
}

.footer-column a {
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--text-sm);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--text-inverse);
}

.footer-column a i {
    font-size: var(--text-base);
}

@media (max-width: 768px) {
    .footer-container {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }

    .footer-links {
        flex-direction: column;
        gap: var(--space-8);
    }
}

/* ==========================================================================
   8. Layout Utilities
   ========================================================================== */

.container {
    width: 100%;
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.container-sm { max-width: var(--container-sm); }
.container-md { max-width: var(--container-md); }
.container-lg { max-width: var(--container-lg); }
.container-2xl { max-width: var(--container-2xl); }

.section {
    padding: var(--space-20) 0;
}

.section-sm { padding: var(--space-12) 0; }
.section-lg { padding: var(--space-24) 0; }

/* Flexbox Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* Grid Utilities */
.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
    .md\:grid-cols-1 { grid-template-columns: 1fr; }
    .md\:flex-col { flex-direction: column; }
}

/* ==========================================================================
   9. Spacing Utilities
   ========================================================================== */

.m-0 { margin: 0; }
.m-auto { margin: auto; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.p-0 { padding: 0; }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-6 { padding-top: var(--space-6); padding-bottom: var(--space-6); }

/* ==========================================================================
   10. Text Utilities
   ========================================================================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-3xl { font-size: var(--text-3xl); }
.text-4xl { font-size: var(--text-4xl); }

.font-normal { font-weight: var(--font-normal); }
.font-medium { font-weight: var(--font-medium); }
.font-semibold { font-weight: var(--font-semibold); }
.font-bold { font-weight: var(--font-bold); }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-muted { color: var(--text-muted); }
.text-inverse { color: var(--text-inverse); }
.text-accent { color: var(--color-accent); }
.text-success { color: var(--color-success); }
.text-error { color: var(--color-error); }

/* ==========================================================================
   11. Background Utilities
   ========================================================================== */

.bg-primary { background-color: var(--bg-primary); }
.bg-secondary { background-color: var(--bg-secondary); }
.bg-tertiary { background-color: var(--bg-tertiary); }
.bg-accent { background-color: var(--color-accent); }
.bg-gradient-primary { background: linear-gradient(135deg, var(--color-primary), var(--color-secondary)); }
.bg-gradient-accent { background: linear-gradient(135deg, var(--color-accent), var(--color-primary)); }
.bg-gradient-hero { background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 50%, var(--color-accent) 100%); }

/* ==========================================================================
   12. Badges & Status Indicators
   ========================================================================== */

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-full);
}

.badge-primary {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.badge-accent {
    background: var(--color-accent-light);
    color: var(--color-accent-dark);
}

.badge-success {
    background: var(--color-success-light);
    color: var(--color-success-dark);
}

.badge-warning {
    background: var(--color-warning-light);
    color: var(--color-warning-dark);
}

.badge-error {
    background: var(--color-error-light);
    color: var(--color-error-dark);
}

.badge-gray {
    background: var(--color-gray-200);
    color: var(--color-gray-700);
}

/* Priority Badges */
.priority-low {
    background: var(--color-gray-200);
    color: var(--color-gray-700);
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
}

.priority-medium {
    background: var(--color-warning-light);
    color: var(--color-warning-dark);
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
}

.priority-high {
    background: #fed7aa;
    color: #c2410c;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
}

.priority-urgent {
    background: var(--color-error-light);
    color: var(--color-error-dark);
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
}

/* Status Badges */
.status-new,
.status-open {
    background: var(--color-info-light);
    color: var(--color-info-dark);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
}

.status-acknowledged {
    background: var(--color-warning-light);
    color: var(--color-warning-dark);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
}

.status-in-progress {
    background: #f3e8ff;
    color: #7c3aed;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
}

.status-completed,
.status-closed {
    background: var(--color-success-light);
    color: var(--color-success-dark);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
}

/* ==========================================================================
   13. Tables
   ========================================================================== */

.table-container {
    overflow-x: auto;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--text-sm);
}

.table th,
.table td {
    padding: var(--space-4);
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

.table th {
    background: var(--bg-secondary);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    white-space: nowrap;
}

.table tbody tr:hover {
    background: var(--bg-secondary);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

/* ==========================================================================
   14. Modals
   ========================================================================== */

.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: var(--z-modal-backdrop);
    display: none;
}

.modal-backdrop.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-dialog {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
    max-width: 560px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn 0.2s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    margin: 0;
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    font-size: var(--text-2xl);
    color: var(--text-tertiary);
    cursor: pointer;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

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

.modal-body {
    padding: var(--space-6);
}

.modal-footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--border-light);
    display: flex;
    gap: var(--space-3);
    justify-content: flex-end;
}

/* ==========================================================================
   15. Alerts & Notifications
   ========================================================================== */

.alert {
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-lg);
    border-left: 4px solid;
    display: flex;
    gap: var(--space-3);
    align-items: flex-start;
}

.alert-success {
    background: var(--color-success-light);
    border-color: var(--color-success);
    color: var(--color-success-dark);
}

.alert-warning {
    background: var(--color-warning-light);
    border-color: var(--color-warning);
    color: var(--color-warning-dark);
}

.alert-error {
    background: var(--color-error-light);
    border-color: var(--color-error);
    color: var(--color-error-dark);
}

.alert-info {
    background: var(--color-info-light);
    border-color: var(--color-info);
    color: var(--color-info-dark);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    z-index: var(--z-tooltip);
    min-width: 300px;
    max-width: 450px;
    padding: var(--space-4) var(--space-5);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    display: flex;
    gap: var(--space-3);
    align-items: center;
    animation: toastSlideIn 0.3s ease-out;
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ==========================================================================
   16. Footer
   ========================================================================== */

.footer {
    background: var(--color-gray-900);
    color: var(--text-inverse);
    padding: var(--space-8) 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-8);
    justify-content: space-between;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: var(--space-6);
}

.footer-link {
    color: var(--color-gray-400);
    font-size: var(--text-sm);
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--text-inverse);
}

.footer-social {
    display: flex;
    gap: var(--space-4);
}

.footer-social a {
    color: var(--color-gray-400);
    font-size: var(--text-xl);
    transition: color var(--transition-fast);
}

.footer-social a:hover {
    color: var(--color-accent);
}

/* ==========================================================================
   17. Animations
   ========================================================================== */

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

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

.animate-fade-in { animation: fadeIn 0.3s ease-out; }
.animate-slide-up { animation: slideUp 0.4s ease-out; }
.animate-pulse { animation: pulse 2s infinite; }
.animate-spin { animation: spin 1s linear infinite; }

/* ==========================================================================
   18. Utility Classes
   ========================================================================== */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.hidden { display: none !important; }
.block { display: block; }
.inline-block { display: inline-block; }
.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }
.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.rounded { border-radius: var(--radius-lg); }
.rounded-full { border-radius: var(--radius-full); }
.rounded-none { border-radius: 0; }

.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-none { box-shadow: none; }

.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

.cursor-pointer { cursor: pointer; }
.cursor-not-allowed { cursor: not-allowed; }

.select-none { user-select: none; }

/* ==========================================================================
   19. Message Notification (used by customer dashboard)
   ========================================================================== */

.message-notification {
    position: fixed;
    top: 100px;
    right: 20px;
    z-index: var(--z-tooltip);
    max-width: 400px;
    animation: toastSlideIn 0.3s ease-out;
}

.message-notification .message-content {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    border-left: 4px solid var(--color-primary);
}

.message-notification.success .message-content {
    border-color: var(--color-success);
}

.message-notification.error .message-content {
    border-color: var(--color-error);
}

.message-notification .message-close {
    background: none;
    border: none;
    font-size: var(--text-xl);
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 0;
    margin-left: auto;
}

.message-notification .message-close:hover {
    color: var(--text-primary);
}

/* ==========================================================================
   20. Dashboard Specific Styles
   ========================================================================== */

.dashboard-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 50%, var(--color-accent) 100%);
    color: var(--text-inverse);
    padding: var(--space-6) 0;
    box-shadow: var(--shadow-lg);
}

.dashboard-nav {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.nav-tabs {
    display: flex;
    list-style: none;
    gap: 0;
    overflow-x: auto;
}

.nav-tab {
    padding: var(--space-4) var(--space-6);
    font-weight: var(--font-medium);
    color: var(--text-tertiary);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.nav-tab:hover {
    color: var(--color-primary);
    background: var(--bg-secondary);
}

.nav-tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-accent);
    background: var(--bg-secondary);
}

.stat-card {
    background: var(--bg-primary);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    text-align: center;
    transition: all var(--transition-base);
}

.stat-card.clickable-stat {
    cursor: pointer;
}

.stat-card.clickable-stat:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.stat-icon {
    font-size: var(--text-4xl);
    color: var(--color-accent);
    margin-bottom: var(--space-4);
}

.stat-number {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    color: var(--color-primary);
    margin-bottom: var(--space-2);
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
}

/* ==========================================================================
   21. Responsive Breakpoints
   ========================================================================== */

@media (max-width: 640px) {
    :root {
        --text-4xl: 1.875rem;
        --text-5xl: 2.25rem;
        --text-6xl: 2.75rem;
    }

    .container {
        padding: 0 var(--space-4);
    }

    .section {
        padding: var(--space-12) 0;
    }

    h1, .h1 { font-size: var(--text-3xl); }
    h2, .h2 { font-size: var(--text-2xl); }
    h3, .h3 { font-size: var(--text-xl); }
}

@media (max-width: 768px) {
    .nav-container {
        height: 70px;
    }

    .nav-logo img {
        height: 50px;
        width: 50px;
    }

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

    .modal-dialog {
        width: 95%;
        margin: var(--space-4);
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .btn-lg {
        padding: var(--space-3) var(--space-6);
        font-size: var(--text-base);
    }
}