/* ============================================================================
   ScreenTech - Smart Modern Design System 2026
   Philosophy: Brutalist meets Swiss Design + Intelligent Microinteractions
   ============================================================================ */

/* ============================================================================
   Design Tokens - Sophisticated Palette
   ============================================================================ */

:root {
    /* Colors - Intelligent Palette */
    --color-black: #0a0a0a;
    --color-black-soft: #1a1a1a;
    --color-gray-900: #171717;
    --color-gray-800: #262626;
    --color-gray-700: #404040;
    --color-gray-600: #525252;
    --color-gray-500: #737373;
    --color-gray-400: #a3a3a3;
    --color-gray-300: #d4d4d4;
    --color-gray-200: #e5e5e5;
    --color-gray-100: #f5f5f5;
    --color-white: #ffffff;

    /* Accent Colors - Used Sparingly */
    --color-blue: #0066ff;
    --color-blue-dark: #0052cc;
    --color-blue-light: #3388ff;
    --color-green: #00ff88;
    --color-green-dark: #00cc6a;
    --color-purple: #8b5cf6;
    --color-orange: #ff6b35;

    /* Semantic Colors */
    --color-text-primary: var(--color-black);
    --color-text-secondary: var(--color-gray-700);
    --color-text-muted: var(--color-gray-500);
    --color-text-inverse: var(--color-white);

    --color-bg-primary: var(--color-white);
    --color-bg-secondary: var(--color-gray-100);
    --color-bg-dark: var(--color-black-soft);

    --color-border: var(--color-gray-200);
    --color-border-strong: var(--color-gray-300);

    /* Typography */
    --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", "Monaco", "Inconsolata", "Fira Code", "Droid Sans Mono", "Source Code Pro", monospace;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Spacing Scale - 4px base */
    --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 */
    --space-32: 8rem;    /* 128px */

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows - Subtle */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.10);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Layout */
    --max-width: 1400px;
    --max-width-text: 65ch;
}

/* ============================================================================
   Reset & Base
   ============================================================================ */

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

html {
    font-size: 62.5%; /* 1rem = 10px */
    scroll-behavior: smooth;
    text-size-adjust: 100%;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-system);
    font-size: 1.6rem;
    font-weight: var(--font-weight-normal);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}

/* Typography with Intelligent Hierarchy */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-system);
    font-weight: var(--font-weight-bold);
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-4);
}

h1 {
    font-size: clamp(4rem, 8vw, 7.2rem);
    letter-spacing: -0.04em;
    font-weight: var(--font-weight-bold);
}

h2 {
    font-size: clamp(3rem, 5vw, 4.8rem);
    letter-spacing: -0.03em;
}

h3 {
    font-size: clamp(2.4rem, 3vw, 3.2rem);
    letter-spacing: -0.02em;
}

h4 {
    font-size: 2rem;
    font-weight: var(--font-weight-semibold);
}

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

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

a:hover {
    opacity: 0.7;
}

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

/* ============================================================================
   Layout System
   ============================================================================ */

.container {
    max-width: var(--max-width);
    margin-inline: auto;
    padding-inline: var(--space-6);
}

.section {
    padding-block: var(--space-24);
}

.section-large {
    padding-block: var(--space-32);
}

/* ============================================================================
   Navigation - Clean & Minimal
   ============================================================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px) saturate(180%);
    border-bottom: 1px solid var(--color-border);
    transition: transform var(--transition-base);
}

.navbar.hidden {
    transform: translateY(-100%);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-block: var(--space-5);
}

.nav-brand {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.03em;
    color: var(--color-text-primary);
}

.brand-text {
    position: relative;
    display: inline-block;
}

.brand-text::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-blue);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-base);
}

.brand-text:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-8);
    align-items: center;
}

.nav-menu a {
    font-size: 1.5rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    position: relative;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-menu a:hover {
    color: var(--color-text-primary);
    background: var(--color-gray-100);
    opacity: 1;
}

.nav-menu a.active {
    color: var(--color-text-primary);
}

.nav-menu a.active::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: var(--space-3);
    right: var(--space-3);
    height: 2px;
    background: var(--color-blue);
}

/* ============================================================================
   Hero - Dynamic & Modern
   ============================================================================ */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--color-white);
    overflow: hidden;
    padding-top: 8rem;
}

/* Grid Background */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--color-gray-200) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-gray-200) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.3;
    mask-image: radial-gradient(ellipse 80% 50% at 50% 40%, black, transparent);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--color-black);
    color: var(--color-white);
    font-size: 1.3rem;
    font-weight: var(--font-weight-medium);
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-6);
    border-radius: var(--radius-full);
}

.status-dot {
    width: 6px;
    height: 6px;
    background: var(--color-green);
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
}

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

.hero-title {
    font-size: clamp(4.8rem, 10vw, 8.8rem);
    font-weight: var(--font-weight-bold);
    line-height: 0.95;
    letter-spacing: -0.04em;
    margin-bottom: var(--space-6);
    color: var(--color-black);
}

.hero-title .highlight {
    position: relative;
    display: inline-block;
    color: var(--color-blue);
}

.hero-subtitle {
    font-size: clamp(1.8rem, 2.5vw, 2.4rem);
    line-height: 1.5;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-10);
    max-width: 70ch;
    margin-inline: auto;
}

.hero-cta {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--space-8);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-text-muted);
    font-size: 1.2rem;
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

.scroll-indicator::after {
    content: '↓';
    font-size: 2rem;
}

/* ============================================================================
   Buttons - Magnetic & Intelligent
   ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-8);
    font-size: 1.6rem;
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

.btn-primary:hover {
    background: var(--color-blue);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    opacity: 1;
}

.btn-secondary {
    background: transparent;
    color: var(--color-black);
    border: 2px solid var(--color-black);
}

.btn-secondary:hover {
    background: var(--color-black);
    color: var(--color-white);
    opacity: 1;
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    padding: var(--space-3) var(--space-4);
}

.btn-ghost:hover {
    color: var(--color-black);
    background: var(--color-gray-100);
    opacity: 1;
}

/* ============================================================================
   Bento Box Grid - Dynamic Layout
   ============================================================================ */

.bento-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--space-6);
    margin-bottom: var(--space-16);
}

.bento-item {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    position: relative;
    overflow: hidden;
    transition: all var(--transition-base);
}

.bento-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-blue), var(--color-purple));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.bento-item:hover::before {
    transform: scaleX(1);
}

.bento-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-border-strong);
}

/* Bento Grid Sizes */
.bento-large {
    grid-column: span 8;
}

.bento-medium {
    grid-column: span 4;
}

.bento-small {
    grid-column: span 3;
}

.bento-wide {
    grid-column: span 6;
}

.bento-item h3 {
    font-size: 2.4rem;
    margin-bottom: var(--space-3);
}

.bento-item p {
    color: var(--color-text-secondary);
    font-size: 1.5rem;
    line-height: 1.6;
}

.bento-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-4);
}

.tech-tag {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    padding: var(--space-1) var(--space-3);
    background: var(--color-gray-100);
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

/* ============================================================================
   Cards with 3D Tilt Effect
   ============================================================================ */

.card-3d {
    position: relative;
    transform-style: preserve-3d;
    transition: transform var(--transition-base);
}

.card-3d:hover {
    transform: rotateX(var(--rotate-x, 0deg)) rotateY(var(--rotate-y, 0deg));
}

.card-3d-content {
    position: relative;
    z-index: 1;
}

.card-3d-shine {
    position: absolute;
    inset: 0;
    background: radial-gradient(
        circle at var(--x, 50%) var(--y, 50%),
        rgba(255, 255, 255, 0.1) 0%,
        transparent 50%
    );
    opacity: 0;
    transition: opacity var(--transition-fast);
    pointer-events: none;
}

.card-3d:hover .card-3d-shine {
    opacity: 1;
}

/* ============================================================================
   Stats Section - Big Numbers
   ============================================================================ */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-8);
    text-align: center;
}

.stat-item {
    padding: var(--space-6);
}

.stat-number {
    font-size: clamp(4rem, 6vw, 7.2rem);
    font-weight: var(--font-weight-bold);
    line-height: 1;
    color: var(--color-blue);
    margin-bottom: var(--space-2);
    font-feature-settings: 'tnum' on, 'lnum' on;
}

.stat-label {
    font-size: 1.4rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: var(--font-weight-medium);
}

/* ============================================================================
   Footer - Minimal
   ============================================================================ */

.footer {
    background: var(--color-black-soft);
    color: var(--color-white);
    padding: var(--space-20) 0 var(--space-8);
    margin-top: var(--space-32);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--space-4);
    color: var(--color-white);
    font-size: 1.6rem;
}

.footer-section p,
.footer-section a {
    color: var(--color-gray-400);
    font-size: 1.4rem;
    max-width: none;
}

.footer-section ul {
    list-style: none;
}

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

.footer-section a:hover {
    color: var(--color-white);
    opacity: 1;
}

.footer-bottom {
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-gray-800);
    text-align: center;
    color: var(--color-gray-500);
    font-size: 1.4rem;
}

/* ============================================================================
   WhatsApp Float Button - Modern
   ============================================================================ */

.whatsapp-float {
    position: fixed;
    bottom: var(--space-8);
    right: var(--space-8);
    width: 60px;
    height: 60px;
    background: #25d366;
    color: white;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    box-shadow: var(--shadow-xl);
    z-index: 999;
    transition: all var(--transition-base);
}

.whatsapp-float:hover {
    transform: scale(1.1);
    box-shadow: 0 20px 35px rgba(37, 211, 102, 0.3);
    opacity: 1;
}

/* ============================================================================
   Certifications - Modern Badges
   ============================================================================ */

.badges-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    justify-content: center;
}

.cert-badge-simple {
    display: inline-flex;
    align-items: center;
    padding: var(--space-3) var(--space-6);
    background: var(--color-white);
    color: var(--color-text-primary);
    border: 2px solid var(--color-border-strong);
    border-radius: var(--radius-full);
    font-size: 1.4rem;
    font-weight: var(--font-weight-semibold);
    transition: all var(--transition-base);
}

.cert-badge-simple:hover {
    background: var(--color-black);
    color: var(--color-white);
    border-color: var(--color-black);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ============================================================================
   Section Title
   ============================================================================ */

.section-title {
    text-align: center;
    margin-bottom: var(--space-12);
}

/* ============================================================================
   Utilities
   ============================================================================ */

.text-center { text-align: center; }
.text-mono { font-family: var(--font-mono); }
.text-muted { color: var(--color-text-muted); }

/* ============================================================================
   Responsive - Tablet
   ============================================================================ */

@media (max-width: 1024px) {
    .bento-large,
    .bento-medium,
    .bento-small,
    .bento-wide {
        grid-column: span 12;
    }
}

/* ============================================================================
   Responsive - Mobile
   ============================================================================ */

@media (max-width: 768px) {
    html {
        font-size: 56.25%; /* 9px */
    }

    .container {
        padding-inline: var(--space-5);
    }

    /* Navbar mobile */
    .navbar .container {
        flex-direction: column;
        gap: var(--space-3);
        padding-block: var(--space-3);
    }

    .nav-menu {
        flex-wrap: wrap;
        gap: var(--space-2) var(--space-4);
        justify-content: center;
    }

    .nav-menu a {
        font-size: 1.4rem;
        padding: var(--space-2);
    }

    /* Hero mobile */
    .hero {
        min-height: auto;
        padding-top: 12rem;
        padding-bottom: var(--space-16);
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-eyebrow {
        font-size: 1.1rem;
        padding: var(--space-2) var(--space-3);
    }

    .hero-title {
        font-size: clamp(3.6rem, 9vw, 5rem);
    }

    .hero-subtitle {
        font-size: 1.6rem;
        max-width: 100%;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

    .scroll-indicator {
        display: none;
    }

    /* Sections mobile */
    .section {
        padding-block: var(--space-16);
    }

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

    .section-title {
        margin-bottom: var(--space-8);
    }

    /* Stats mobile */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-4);
    }

    .stat-item {
        padding: var(--space-4);
    }

    .stat-number {
        font-size: clamp(3.2rem, 8vw, 4.8rem);
    }

    /* Bento mobile */
    .bento-grid {
        gap: var(--space-4);
        margin-bottom: var(--space-8);
    }

    .bento-item {
        padding: var(--space-6);
    }

    .bento-item h3 {
        font-size: 2rem;
    }

    /* Certifications mobile */
    .badges-container {
        gap: var(--space-3);
    }

    .cert-badge-simple {
        font-size: 1.3rem;
        padding: var(--space-2) var(--space-4);
    }

    /* Footer mobile */
    .footer {
        margin-top: var(--space-16);
        padding: var(--space-12) 0 var(--space-6);
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
        text-align: center;
    }

    .footer-section p {
        margin-inline: auto;
    }

    /* WhatsApp button mobile */
    .whatsapp-float {
        bottom: var(--space-5);
        right: var(--space-5);
        width: 52px;
        height: 52px;
        font-size: 2.6rem;
    }
}

/* ============================================================================
   Responsive - Small Mobile (< 480px)
   ============================================================================ */

@media (max-width: 480px) {
    .container {
        padding-inline: var(--space-4);
    }

    .hero-title {
        font-size: clamp(3rem, 8vw, 4rem);
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .nav-menu {
        gap: var(--space-1) var(--space-3);
    }
}

/* Selection */
::selection {
    background: var(--color-blue);
    color: var(--color-white);
}