/**
 * CTRL Vision - Main Stylesheet
 * White, Grey, and Black color scheme with shadows, animations, and hover effects
 * Responsive for Mobile, Web, and Tablet
 */

/* ============================================
   IMPORT SECTION STYLES
   ============================================ */
@import url('css/1.css');  /* About Section */
@import url('css/2.css');  /* Features Section */
@import url('css/3.css');  /* Uses Section */
@import url('css/4.css');  /* How It Works Section */
@import url('css/5.css');  /* Summary/Contact Section */


/* ============================================
   CSS VARIABLES - DESIGN SYSTEM
   ============================================ */
:root {
    /* Colors */
    --color-white: #FFFFFF;
    --color-off-white: #FAFAFA;
    --color-light-grey: #F5F5F5;
    --color-grey-100: #E8E8E8;
    --color-grey-200: #D0D0D0;
    --color-grey-300: #B8B8B8;
    --color-grey-400: #A0A0A0;
    --color-grey-500: #808080;
    --color-grey-600: #606060;
    --color-grey-700: #404040;
    --color-grey-800: #282828;
    --color-grey-900: #1A1A1A;
    --color-black: #000000;
    
    /* Semantic Colors */
    --color-primary: var(--color-grey-900);
    --color-secondary: var(--color-grey-600);
    --color-accent: var(--color-grey-800);
    --color-background: var(--color-white);
    --color-surface: var(--color-off-white);
    --color-text-primary: var(--color-grey-900);
    --color-text-secondary: var(--color-grey-600);
    --color-text-light: var(--color-grey-400);
    --color-border: var(--color-grey-200);
    
    /* 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 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-hover: 0 15px 30px -5px rgba(0, 0, 0, 0.15), 0 5px 10px -5px rgba(0, 0, 0, 0.08);
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    --spacing-4xl: 8rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-3xl: 2rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    --transition-slower: 500ms ease-in-out;
    
    /* Header */
    --header-height: 80px;
    --header-width: 75%;
    --header-padding: 1.5rem 2rem;
    --header-border-radius: var(--radius-3xl);
    
    /* Z-Index Scale */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
}


/* ============================================
   RESET & BASE STYLES
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-primary);
    font-weight: var(--font-weight-normal);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-background);
    overflow-x: hidden;
    transition: background-color var(--transition-slow);
}

body.loaded {
    opacity: 1;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

video {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    outline: none;
}


/* ============================================
   FIXED HEADER - 75% WIDTH, ROUNDED CORNERS
   ============================================ */
.fixed-header {
    position: fixed;
    top: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    width: var(--header-width);
    max-width: 1400px;
    height: var(--header-height);
    z-index: var(--z-fixed);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--header-border-radius);
    padding: var(--header-padding);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.fixed-header.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-lg);
    top: var(--spacing-sm);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    max-width: 100%;
}

/* Logo */
.logo {
    z-index: var(--z-fixed);
}

.logo-image {
    height: 45px;
    width: auto;
    display: block;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.logo a:hover .logo-image {
    opacity: 0.85;
    transform: scale(1.02);
}

/* Text logo - kept as fallback */
.logo-text {
    font-size: 1.75rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    letter-spacing: -0.02em;
    transition: color var(--transition-fast);
}

.logo a:hover .logo-text {
    color: var(--color-grey-700);
}

/* Navigation */
.main-nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.main-nav .nav-link {
    font-size: 0.95rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.main-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background-color: var(--color-primary);
    transition: transform var(--transition-fast);
}

.main-nav .nav-link:hover,
.main-nav .nav-link.active {
    color: var(--color-primary);
}

.main-nav .nav-link:hover::after,
.main-nav .nav-link.active::after {
    transform: translateX(-50%) scaleX(1);
}

.main-nav .nav-link.cta {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
}

.main-nav .nav-link.cta::after {
    display: none;
}

.main-nav .nav-link.cta:hover {
    background-color: var(--color-grey-800);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    cursor: pointer;
    z-index: var(--z-fixed);
}

.hamburger,
.hamburger::before,
.hamburger::after {
    width: 24px;
    height: 2px;
    background-color: var(--color-primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.hamburger {
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    top: 8px;
}

.mobile-menu-toggle.active .hamburger {
    background-color: transparent;
}

.mobile-menu-toggle.active .hamburger::before {
    transform: rotate(45deg);
    top: 0;
}

.mobile-menu-toggle.active .hamburger::after {
    transform: rotate(-45deg);
    top: 0;
}


/* ============================================
   MAIN CONTENT
   ============================================ */
#main-content {
    padding-top: calc(var(--header-height) + var(--spacing-xl));
}

.section {
    min-height: 100vh;
    position: relative;
    padding: var(--spacing-4xl) var(--spacing-lg);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-slower), transform var(--transition-slower);
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-content {
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: var(--z-base);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    font-size: clamp(2rem, 4vw, 3.5rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}


/* ============================================
   BUTTONS & INTERACTIVE ELEMENTS
   ============================================ */
.btn-primary {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-white);
    background-color: var(--color-primary);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    cursor: pointer;
}

.btn-primary:hover {
    background-color: var(--color-grey-800);
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.btn-primary:active {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    background-color: transparent;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    cursor: pointer;
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}


/* ============================================
   FOOTER
   ============================================ */
#main-footer {
    background-color: var(--color-grey-900);
    color: var(--color-white);
    padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-xl);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
}

.footer-logo {
    margin-bottom: var(--spacing-lg);
}

.footer-logo-image {
    height: 50px;
    width: auto;
    margin: 0 auto;
    display: block;
    transition: opacity var(--transition-fast);
}

.footer-logo-image:hover {
    opacity: 0.8;
}

.footer-logo .logo-text {
    color: var(--color-white);
    font-size: 2rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--color-grey-300);
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-white);
}

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-grey-700);
}

.footer-bottom p {
    color: var(--color-grey-400);
    font-size: 0.875rem;
    margin: 0;
}


/* ============================================
   ANIMATIONS & KEYFRAMES
   ============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-60px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(60px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}


/* ============================================
   UTILITY CLASSES
   ============================================ */
.highlight {
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
}

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

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

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

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

.fade-in {
    animation: fadeIn var(--transition-slow) ease-out;
}


/* ============================================
   RESPONSIVE DESIGN - TABLET
   ============================================ */
@media (max-width: 1024px) {
    :root {
        --header-width: 85%;
        --header-padding: 1.25rem 1.5rem;
        --spacing-3xl: 4rem;
        --spacing-4xl: 6rem;
    }

    .section {
        padding: var(--spacing-3xl) var(--spacing-md);
    }

    .main-nav ul {
        gap: var(--spacing-md);
    }

    .main-nav .nav-link {
        font-size: 0.9rem;
    }
}


/* ============================================
   RESPONSIVE DESIGN - MOBILE
   ============================================ */
@media (max-width: 768px) {
    :root {
        --header-width: 90%;
        --header-height: 70px;
        --header-padding: 1rem;
        --header-border-radius: var(--radius-2xl);
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
        --spacing-3xl: 3rem;
        --spacing-4xl: 4rem;
    }

    .fixed-header {
        top: var(--spacing-sm);
    }

    .fixed-header.scrolled {
        top: var(--spacing-xs);
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .main-nav {
        position: fixed;
        top: calc(var(--header-height) + var(--spacing-md) + var(--spacing-sm));
        left: 50%;
        transform: translateX(-50%) translateY(-20px);
        width: 90%;
        max-width: 400px;
        background-color: var(--color-white);
        border-radius: var(--radius-2xl);
        box-shadow: var(--shadow-2xl);
        padding: var(--spacing-lg);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
        z-index: calc(var(--z-fixed) - 1);
    }

    .main-nav.active {
        opacity: 1;
        visibility: visible;
        transform: translateX(-50%) translateY(0);
    }

    .main-nav ul {
        flex-direction: column;
        gap: 0;
        width: 100%;
    }

    .main-nav li {
        width: 100%;
        border-bottom: 1px solid var(--color-grey-100);
    }

    .main-nav li:last-child {
        border-bottom: none;
    }

    .main-nav .nav-link {
        display: block;
        width: 100%;
        padding: var(--spacing-md);
        text-align: center;
        font-size: 1rem;
    }

    .main-nav .nav-link.cta {
        margin-top: var(--spacing-sm);
        border-radius: var(--radius-lg);
    }

    .main-nav .nav-link::after {
        display: none;
    }

    .section {
        min-height: auto;
        padding: var(--spacing-2xl) var(--spacing-md);
    }

    #main-content {
        padding-top: calc(var(--header-height) + var(--spacing-2xl));
    }

    h1 {
        font-size: clamp(2rem, 6vw, 3rem);
    }

    h2 {
        font-size: clamp(1.75rem, 5vw, 2.5rem);
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}


/* ============================================
   RESPONSIVE DESIGN - SMALL MOBILE
   ============================================ */
@media (max-width: 480px) {
    :root {
        --header-width: 95%;
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
    }

    .logo-text {
        font-size: 1.5rem;
    }

    .logo-image {
        height: 38px;
    }

    .section-title {
        margin-bottom: var(--spacing-2xl);
    }
}


/* ============================================
   ACCESSIBILITY
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

/* Skip to main content link */
.skip-to-main {
    position: absolute;
    left: -9999px;
    top: var(--spacing-sm);
    z-index: var(--z-tooltip);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-md);
}

.skip-to-main:focus {
    left: var(--spacing-sm);
}


/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    .fixed-header,
    .mobile-menu-toggle,
    #main-footer {
        display: none;
    }

    .section {
        page-break-inside: avoid;
    }
}