/* Local Font Configuration */
@font-face {
    font-family: 'Inter';
    src: url('../assets/fonts/Inter-Regular.woff2') format('woff2'),
         url('../assets/fonts/Inter-Regular.woff') format('woff');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Inter';
    src: url('../assets/fonts/Inter-SemiBold.woff2') format('woff2'),
         url('../assets/fonts/Inter-SemiBold.woff') format('woff');
    font-weight: 600;
    font-style: normal;
    font-display: swap;
}

/* CSS Custom Properties & Theming */
:root {
    --color-primary: #2563EB; /* Tech Blue */
    --color-primary-hover: #1D4ED8;
    --transition-speed: 0.3s;
    --border-radius: 12px;
}

/* Light Theme Variables */
[data-theme="light"] {
    --bg-base: #F8FAFC;
    --bg-surface: #FFFFFF; /* Crisp White */
    --text-primary: #0F172A; /* Deep Navy */
    --text-secondary: #475569;
    --border-color: #E2E8F0;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --shadow-soft: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --bg-base: #0F172A; /* Deep Navy */
    --bg-surface: #1E293B; /* Charcoal Dark */
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --border-color: #334155;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --shadow-soft: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

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

/* Focus Rings for Keyboard Navigation */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
}

/* Dashboard Layout */
.dashboard {
    flex: 1;
    padding: 3rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.hero-section {
    margin-bottom: 3rem;
}

.hero-section h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

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

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

/* Glassmorphism Cards */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-soft);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    display: flex;
    flex-direction: column;
}

.glass:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.tool-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.tool-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

/* Buttons */
.btn-primary {
    background-color: var(--color-primary);
    color: #FFFFFF;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: background-color var(--transition-speed);
}

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

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
}

/* Footer Architecture */
.app-footer {
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    padding: 3rem 2rem;
    margin-top: auto;
}

.footer-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
}

.footer-brand h3 {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.security-badge {
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.copyright {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.footer-links h4 {
    margin-bottom: 1.25rem;
}

.footer-links ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.footer-links a {
    text-decoration: none;
    color: var(--text-secondary);
    transition: color var(--transition-speed);
}

.footer-links a:hover, .footer-links a:focus {
    color: var(--color-primary);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}