/* ==========================================================================
   2. RESET & BASE
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

/* Skip to main content link - visible on focus for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--accent-color);
    color: #fafafa;
    padding: 8px 16px;
    text-decoration: none;
    z-index: 10000;
    font-weight: 600;
    border-radius: 0 0 4px 0;
}

.skip-link:focus {
    top: 0;
    clip: auto;
    width: auto;
    height: auto;
    padding: 8px 16px;
}

/* ==========================================================================
   3. CSS VARIABLES - Design Tokens
   ========================================================================== */
:root {
    /* Colors - Dark Theme (Default) */
    --primary-color: #fafafa;
    --accent-color: #0073ff;
    --accent-color-light: #4da3ff;
    --bg-primary: #0a0a0a;
    --bg-secondary: #0a0a0a;
    --bg-tertiary: #1a1a1a;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-color-hover: rgba(255, 255, 255, 0.15);
    --text-primary: #fafafa;
    --text-secondary: #c8c8c8;
    --text-muted: #8a8a8a;

    /* Hero preview hover glow (Dark) – albastru accent, în linie cu schema */
    --hero-preview-glow: rgba(0, 115, 255, 0.28);

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    
    /* Transitions - iOS-style easing curves */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Variables */
[data-theme="light"] {
    --bg-primary: #fafafa;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e8e8e8;
    --border-color: rgba(0, 0, 0, 0.12);
    --border-color-hover: rgba(0, 0, 0, 0.25);
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-muted: #6a6a6a;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);

}

/* Auto-detect system preference (fallback only) */
@media (prefers-color-scheme: light) {
    :root:not([data-theme]) {
        --bg-primary: #fafafa;
        --bg-secondary: #f5f5f5;
        --bg-tertiary: #e8e8e8;
        --border-color: rgba(0, 0, 0, 0.12);
        --border-color-hover: rgba(0, 0, 0, 0.25);
        --text-primary: #0a0a0a;
        --text-secondary: #4a4a4a;
        --text-muted: #707070;
        --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
        --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
        --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    }
}

/* ==========================================================================
   4. BASE STYLES
   ========================================================================== */
html {
    scroll-behavior: smooth;
    overscroll-behavior: contain;
}

/* Disable smooth scroll during rapid scrolling to prevent lag */
@media (prefers-reduced-motion: no-preference) {
    html:not(.smooth-scroll-disabled) {
        scroll-behavior: smooth;
    }
    
    html.smooth-scroll-disabled {
        scroll-behavior: auto;
    }
}

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 17px;
    line-height: 1.47;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-weight: 300;
    transition: background-color 0.3s var(--ease-out), 
                color 0.3s var(--ease-out);
    overscroll-behavior: contain;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}