/* Office Smart Apps - Main Stylesheet
   Dark/Light Theme Support with CSS Variables
   ========================================= */

/* ========== CSS Variables - Light Theme (Default) ========== */
:root,
[data-theme="light"] {
    /* Core Colors */
    --color-primary: hsl(220, 45%, 25%);
    --color-primary-dark: hsl(220, 45%, 20%);
    --color-primary-light: hsl(220, 35%, 35%);
    
    --color-accent: hsl(150, 25%, 45%);
    --color-accent-hover: hsl(150, 25%, 40%);
    --color-accent-subtle: hsl(150, 25%, 92%);
    
    /* Backgrounds */
    --color-background: hsl(40, 33%, 98%);
    --color-background-alt: hsl(40, 20%, 94%);
    --color-surface: hsl(0, 0%, 100%);
    
    /* Text */
    --color-foreground: hsl(220, 25%, 15%);
    --color-muted: hsl(220, 15%, 45%);
    --color-muted-foreground: hsl(220, 10%, 55%);
    
    /* Borders */
    --color-border: hsl(220, 15%, 88%);
    --color-border-light: hsl(220, 15%, 92%);
    
    /* Header/Footer */
    --color-header-bg: hsla(40, 33%, 98%, 0.95);
    --color-footer-bg: hsl(40, 20%, 96%);
    
    /* Hero Section */
    --color-hero-bg: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    --color-hero-text: hsl(0, 0%, 100%);
    
    /* Shadows */
    --shadow-sm: 0 1px 3px hsla(220, 25%, 15%, 0.04), 0 4px 12px hsla(220, 25%, 15%, 0.06);
    --shadow-md: 0 4px 12px hsla(220, 25%, 15%, 0.08), 0 8px 24px hsla(220, 25%, 15%, 0.1);
    
    /* Transitions */
    --transition-fast: 200ms ease;
    --transition-normal: 300ms ease;
}

/* ========== CSS Variables - Dark Theme ========== */
[data-theme="dark"] {
    /* Core Colors */
    --color-primary: hsl(220, 40%, 55%);
    --color-primary-dark: hsl(220, 40%, 50%);
    --color-primary-light: hsl(220, 35%, 65%);
    
    --color-accent: hsl(150, 35%, 50%);
    --color-accent-hover: hsl(150, 35%, 55%);
    --color-accent-subtle: hsl(150, 25%, 20%);
    
    /* Backgrounds */
    --color-background: hsl(220, 20%, 12%);
    --color-background-alt: hsl(220, 18%, 16%);
    --color-surface: hsl(220, 18%, 18%);
    
    /* Text */
    --color-foreground: hsl(220, 15%, 92%);
    --color-muted: hsl(220, 10%, 65%);
    --color-muted-foreground: hsl(220, 10%, 55%);
    
    /* Borders */
    --color-border: hsl(220, 15%, 25%);
    --color-border-light: hsl(220, 15%, 22%);
    
    /* Header/Footer */
    --color-header-bg: hsla(220, 20%, 12%, 0.95);
    --color-footer-bg: hsl(220, 18%, 14%);
    
    /* Hero Section */
    --color-hero-bg: linear-gradient(135deg, hsl(220, 35%, 22%) 0%, hsl(220, 30%, 30%) 100%);
    --color-hero-text: hsl(0, 0%, 100%);
    
    /* Shadows */
    --shadow-sm: 0 1px 3px hsla(0, 0%, 0%, 0.2), 0 4px 12px hsla(0, 0%, 0%, 0.25);
    --shadow-md: 0 4px 12px hsla(0, 0%, 0%, 0.3), 0 8px 24px hsla(0, 0%, 0%, 0.35);
}

/* ========== Base Styles ========== */
html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--color-background);
    color: var(--color-foreground);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ========== Site Logo ========== */
.site-logo {
    height: 48px;
    width: auto;
}

/* ========== Typography ========== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-foreground);
}

.text-accent {
    color: var(--color-accent) !important;
}

.text-muted {
    color: var(--color-muted) !important;
}

.text-dark {
    color: var(--color-foreground) !important;
}

.tagline {
    color: hsla(0, 0%, 100%, 0.8);
    font-weight: 500;
    letter-spacing: 0.05em;
}

.tagline-text {
    color: var(--color-accent);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.02em;
}

/* ========== Theme Toggle Button ========== */
.theme-toggle-btn {
    background: var(--color-background-alt);
    border: 1px solid var(--color-border);
    color: var(--color-foreground);
    padding: 0.375rem 0.5rem;
    border-radius: 0.5rem;
    transition: var(--transition-fast);
}

.theme-toggle-btn:hover {
    background: var(--color-border);
    color: var(--color-foreground);
}

/* Show/hide appropriate icon based on theme */
[data-theme="light"] .theme-icon-light,
[data-theme="dark"] .theme-icon-dark {
    display: none;
}

[data-theme="light"] .theme-icon-dark,
[data-theme="dark"] .theme-icon-light {
    display: inline-block;
}

/* ========== Header Section ========== */
.header-section {
    background-color: var(--color-header-bg);
    backdrop-filter: blur(8px);
}

.brand-text {
    color: var(--color-foreground);
}

/* ========== Navigation ========== */
.navbar {
    padding: 0.75rem 0;
}

.navbar-brand {
    font-weight: 600;
    color: var(--color-foreground);
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-muted);
    padding: 0.5rem 1rem !important;
    border-radius: 0.5rem;
    transition: var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-foreground);
    background-color: var(--color-background-alt);
}

/* Dark mode navbar toggler */
[data-theme="dark"] .navbar-toggler {
    border-color: var(--color-border);
}

[data-theme="dark"] .navbar-toggler-icon {
    filter: invert(1);
}

/* ========== Hero Section ========== */
.hero-section {
    background: var(--color-hero-bg);
    color: var(--color-hero-text);
}

/* ========== Buttons ========== */
.btn {
    font-weight: 500;
    border-radius: 0.5rem;
    transition: var(--transition-fast);
}

.btn-light {
    background-color: white;
    color: var(--color-primary);
    border: none;
}

.btn-light:hover {
    background-color: hsla(0, 0%, 100%, 0.9);
    color: var(--color-primary-dark);
}

.btn-outline-light {
    border-width: 2px;
    border-color: hsla(0, 0%, 100%, 0.3);
}

.btn-outline-light:hover {
    background-color: hsla(0, 0%, 100%, 0.1);
}

.btn-secondary {
    background-color: var(--color-background-alt);
    color: var(--color-foreground);
    border: none;
}

.btn-secondary:hover {
    background-color: var(--color-border);
    color: var(--color-foreground);
}

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

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

.btn-accent {
    background-color: var(--color-accent);
    color: white;
    border: none;
}

.btn-accent:hover {
    background-color: var(--color-accent-hover);
    color: white;
}

/* ========== Cards ========== */
.product-card {
    background-color: var(--color-surface);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.product-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.product-card:hover h3 {
    color: var(--color-accent);
}

.access-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

/* ========== Icon Box ========== */
.icon-box {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.5rem;
}

.bg-accent-subtle {
    background-color: var(--color-accent-subtle) !important;
}

/* ========== Dot Indicator ========== */
.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.bg-accent {
    background-color: var(--color-accent) !important;
}

/* ========== Page Header ========== */
.page-header {
    background-color: var(--color-background-alt);
    border-bottom: 1px solid var(--color-border);
    padding: 3rem 0;
}

.page-header h1 {
    margin-bottom: 0.25rem;
}

/* ========== Footer ========== */
.footer-section {
    background-color: var(--color-footer-bg);
}

.footer-heading {
    color: var(--color-foreground);
}

.footer-text {
    color: var(--color-muted);
}

.footer-brand-text {
    color: var(--color-foreground);
}

.footer-link {
    color: var(--color-muted);
    transition: var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-accent) !important;
}

/* ========== Social Links ========== */
.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 0.5rem;
    background-color: var(--color-background-alt);
    color: var(--color-muted);
    text-decoration: none;
    transition: var(--transition-fast);
}

.social-link:hover {
    background-color: var(--color-accent);
    color: white;
    transform: translateY(-2px);
}

.social-link svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

.social-link i {
    font-size: 1rem;
}

/* ========== Form Controls ========== */
.form-control,
.form-select {
    border-radius: 0.5rem;
    border-color: var(--color-border);
    background-color: var(--color-surface);
    color: var(--color-foreground);
    padding: 0.625rem 0.875rem;
    transition: var(--transition-fast);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 0.2rem hsla(220, 45%, 25%, 0.15);
    background-color: var(--color-surface);
    color: var(--color-foreground);
}

.form-control::placeholder {
    color: var(--color-muted-foreground);
}

.form-label {
    color: var(--color-foreground);
    font-weight: 500;
}

.invalid-feedback {
    color: hsl(0, 70%, 50%);
}

[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
    background-color: var(--color-surface);
    border-color: var(--color-border);
    color: var(--color-foreground);
}

/* ========== Alerts ========== */
.alert-light {
    background-color: var(--color-background-alt);
    border-color: var(--color-border);
    color: var(--color-foreground);
}

.alert-success {
    background-color: hsl(150, 40%, 92%);
    border-color: hsl(150, 40%, 80%);
    color: hsl(150, 50%, 25%);
}

[data-theme="dark"] .alert-success {
    background-color: hsl(150, 30%, 20%);
    border-color: hsl(150, 30%, 30%);
    color: hsl(150, 40%, 70%);
}

/* ========== Utilities ========== */
.bg-light {
    background-color: var(--color-background-alt) !important;
}

.bg-white {
    background-color: var(--color-surface) !important;
}

.border-bottom {
    border-color: var(--color-border) !important;
}

.border-top {
    border-color: var(--color-border) !important;
}

.rounded-3 {
    border-radius: 0.75rem !important;
}

/* ========== Content Sections ========== */
.content-section {
    padding: 4rem 0;
}

.content-section h2 {
    margin-bottom: 1.5rem;
}

.content-section ul {
    padding-left: 1.25rem;
}

.content-section li {
    margin-bottom: 0.5rem;
}

/* ========== Feature List ========== */
.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.feature-list li i {
    color: var(--color-accent);
    margin-top: 0.25rem;
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .hero-section {
        padding: 3rem 0;
    }
    
    .page-header {
        padding: 2rem 0;
    }
    
    .content-section {
        padding: 3rem 0;
    }
    
    .navbar-collapse {
        padding-top: 1rem;
    }
    
    .nav-link {
        padding: 0.75rem 1rem !important;
    }
    
    .social-link {
        width: 40px;
        height: 40px;
    }
}

/* ========== Animations ========== */
@media (prefers-reduced-motion: no-preference) {
    .product-card,
    .btn,
    .nav-link,
    .social-link {
        transition: all var(--transition-fast);
    }
}

/* ========== Print Styles ========== */
@media print {
    .navbar,
    .footer-section,
    .theme-toggle-btn {
        display: none;
    }
    
    body {
        font-size: 12pt;
        background: white;
        color: black;
    }
}