/* ================================================================
   IntraSync Industrial — Shared Styles
   ================================================================ */

/* ===== Design Tokens ===== */
:root {
    --color-primary: #667eea;
    --color-primary-dark: #5a67d8;
    --color-accent: #764ba2;
    --color-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --header-height: 72px;
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: var(--font-primary);
}

/* ===== Keyframe Animations ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-30px); }
    to { opacity: 1; transform: translateY(0); }
}

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

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

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

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(50px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 5px rgba(102, 126, 234, 0.3); }
    50% { box-shadow: 0 0 20px rgba(102, 126, 234, 0.6); }
}

@keyframes shimmer {
    0% { background-position: -200% center; }
    100% { background-position: 200% center; }
}

@keyframes scan-sweep {
    0% { top: 0; opacity: 0; }
    5% { opacity: 1; }
    95% { opacity: 1; }
    100% { top: 100%; opacity: 0; }
}

@keyframes draw-line {
    from { stroke-dashoffset: 1000; }
    to { stroke-dashoffset: 0; }
}

@keyframes dot-travel {
    0% { offset-distance: 0%; opacity: 0; }
    5% { opacity: 1; }
    95% { opacity: 1; }
    100% { offset-distance: 100%; opacity: 0; }
}

@keyframes stamp-in {
    0% { transform: scale(3) rotate(-15deg); opacity: 0; }
    60% { transform: scale(0.9) rotate(2deg); opacity: 1; }
    80% { transform: scale(1.05) rotate(-1deg); }
    100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

@keyframes progress-fill {
    from { width: 0; }
}

/* ===== GSAP Animation Target Classes ===== */
.gs-fade-up { opacity: 0; transform: translateY(40px); }
.gs-fade-down { opacity: 0; transform: translateY(-40px); }
.gs-fade-left { opacity: 0; transform: translateX(-40px); }
.gs-fade-right { opacity: 0; transform: translateX(40px); }
.gs-scale-in { opacity: 0; transform: scale(0.8); }
.gs-stagger-item { opacity: 0; transform: translateY(30px); }

/* Graceful degradation: if GSAP fails to load */
.no-gsap .gs-fade-up,
.no-gsap .gs-fade-down,
.no-gsap .gs-fade-left,
.no-gsap .gs-fade-right,
.no-gsap .gs-scale-in,
.no-gsap .gs-stagger-item {
    opacity: 1;
    transform: none;
}

/* ===== Shared Component Styles ===== */
.gradient-bg {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.gradient-text {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.shimmer-text {
    background: linear-gradient(
        90deg,
        #667eea 0%,
        #a78bfa 25%,
        #c084fc 50%,
        #a78bfa 75%,
        #667eea 100%
    );
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 4s linear infinite;
}

/* Module / Feature Card */
.module-card {
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.module-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--color-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.module-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.module-card:hover::before {
    transform: scaleX(1);
}

.module-icon,
.feature-icon {
    transition: transform var(--transition-base);
}

.module-card:hover .module-icon,
.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

/* Partner Card */
.partner-card {
    transition: all var(--transition-base);
}

.partner-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px -4px rgba(0, 0, 0, 0.1);
}

/* Floating CTA Button */
.cta-button-fixed {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 100;
    box-shadow: 0 10px 40px rgba(102, 126, 234, 0.4);
    animation: float 3s ease-in-out infinite;
    transition: all var(--transition-base);
}

.cta-button-fixed:hover {
    box-shadow: 0 15px 50px rgba(102, 126, 234, 0.6);
    transform: translateY(-2px);
}

/* Integration Line */
.integration-line {
    background: var(--color-gradient);
}

/* Stat Numbers */
.stat-number {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1;
}

.counter-value {
    font-variant-numeric: tabular-nums;
}

/* ===== Header Scroll Behavior ===== */
.site-header {
    transition: padding 0.3s ease, box-shadow 0.3s ease;
}

.site-header--scrolled {
    padding-top: 0.25rem;
    padding-bottom: 0.25rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.site-header--scrolled .h-12 {
    height: 2.5rem;
    transition: height 0.3s ease;
}

/* ===== Mobile Nav Hamburger ===== */
.hamburger-btn {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
    z-index: 60;
}

.hamburger-line {
    display: block;
    width: 24px;
    height: 2px;
    background: #374151;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.hamburger-line + .hamburger-line {
    margin-top: 6px;
}

/* Hamburger → X animation */
.hamburger-btn.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
}

.hamburger-btn.active .hamburger-line:nth-child(2) {
    opacity: 0;
    transform: translateX(-10px);
}

.hamburger-btn.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -6px);
}

/* ===== Mobile Nav Drawer ===== */
.mobile-nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 55;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    backdrop-filter: blur(4px);
}

.mobile-nav-overlay.active {
    opacity: 1;
    visibility: visible;
}

.mobile-nav-drawer {
    position: fixed;
    top: 0;
    right: 0;
    width: 300px;
    max-width: 85vw;
    height: 100vh;
    height: 100dvh;
    background: white;
    z-index: 56;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.1);
}

.mobile-nav-drawer.active {
    transform: translateX(0);
}

.mobile-nav-drawer .nav-link {
    display: block;
    padding: 1rem 1.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: #374151;
    border-bottom: 1px solid #f3f4f6;
    transition: all 0.2s ease;
}

.mobile-nav-drawer .nav-link:hover,
.mobile-nav-drawer .nav-link.active {
    color: #1d4ed8;
    background: #eff6ff;
    padding-left: 2rem;
}

.mobile-nav-drawer .mobile-cta {
    display: block;
    margin: 1.5rem;
    padding: 0.875rem 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-weight: 700;
    text-align: center;
    border-radius: 0.5rem;
    transition: all 0.2s ease;
}

.mobile-nav-drawer .mobile-cta:hover {
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

/* Body scroll lock */
body.nav-open {
    overflow: hidden;
}

/* ===== Reading Progress Bar ===== */
.reading-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: var(--color-gradient);
    z-index: 100;
    width: 0%;
    transition: width 0.1s linear;
}

/* ===== Scan Line Effect (Verify page) ===== */
.scan-line {
    position: absolute;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(249, 115, 22, 0.6), transparent);
    animation: scan-sweep 4s ease-in-out infinite;
    pointer-events: none;
}

.scan-line-green {
    background: linear-gradient(90deg, transparent, rgba(34, 197, 94, 0.6), transparent);
}

/* ===== Grid Pattern Overlay ===== */
.grid-overlay {
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
}

/* ===== Interactive Workflow Stepper ===== */
.workflow-step {
    cursor: pointer;
    transition: all var(--transition-base);
}

.workflow-step:hover .step-circle,
.workflow-step.active .step-circle {
    transform: scale(1.15);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.2);
}

.workflow-step .step-circle {
    transition: all var(--transition-base);
}

.workflow-detail {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.5s ease, opacity 0.3s ease;
}

.workflow-detail.active {
    max-height: 500px;
    opacity: 1;
}

/* ===== Before/After Comparison Slider ===== */
.comparison-slider {
    position: relative;
    overflow: hidden;
    cursor: ew-resize;
    user-select: none;
}

.comparison-slider .comparison-after {
    position: absolute;
    inset: 0;
    clip-path: inset(0 0 0 50%);
    transition: clip-path 0s;
}

.comparison-slider .comparison-divider {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 4px;
    background: white;
    z-index: 10;
    transform: translateX(-50%);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
}

.comparison-slider .comparison-handle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 44px;
    height: 44px;
    background: white;
    border-radius: 50%;
    z-index: 11;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    font-weight: bold;
    color: #667eea;
    font-size: 1.25rem;
}

/* ===== Interactive Checklist ===== */
.checklist-item {
    transition: all var(--transition-base);
    cursor: pointer;
}

.checklist-item:hover {
    background: #f0fdf4;
}

.checklist-item.checked {
    background: #f0fdf4;
}

.checklist-item .check-box {
    width: 24px;
    height: 24px;
    border: 2px solid #d1d5db;
    border-radius: 6px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.checklist-item.checked .check-box {
    background: #22c55e;
    border-color: #22c55e;
}

.checklist-item .check-mark {
    opacity: 0;
    transform: scale(0);
    transition: all 0.2s ease;
    color: white;
    font-weight: bold;
}

.checklist-item.checked .check-mark {
    opacity: 1;
    transform: scale(1);
}

.checklist-progress-bar {
    height: 8px;
    background: #e5e7eb;
    border-radius: 4px;
    overflow: hidden;
}

.checklist-progress-fill {
    height: 100%;
    background: var(--color-gradient);
    border-radius: 4px;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.qc-stamp {
    opacity: 0;
    transform: scale(3) rotate(-15deg);
    transition: none;
    pointer-events: none;
}

.qc-stamp.visible {
    animation: stamp-in 0.5s ease-out forwards;
}

/* ===== Filter Tabs ===== */
.filter-tab {
    padding: 0.5rem 1.25rem;
    border-radius: 9999px;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-base);
    border: 2px solid #e5e7eb;
    background: white;
    color: #4b5563;
}

.filter-tab:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.filter-tab.active {
    background: var(--color-gradient);
    color: white;
    border-color: transparent;
}

.filter-tab .tab-count {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    margin-left: 0.375rem;
}

.filter-tab:not(.active) .tab-count {
    background: #f3f4f6;
}

/* ===== Protocol Pulse Ring ===== */
.protocol-card {
    position: relative;
    transition: all var(--transition-base);
}

.protocol-card:hover {
    transform: translateY(-4px);
}

.protocol-card::after {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: inherit;
    border: 2px solid transparent;
    transition: border-color 0.3s ease;
}

.protocol-card:hover::after {
    border-color: var(--color-primary);
    animation: pulse-glow 1.5s ease-in-out infinite;
}

/* ===== FAQ Accordion ===== */
.faq-item {
    border-bottom: 1px solid #e5e7eb;
}

.faq-question {
    cursor: pointer;
    padding: 1.25rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    transition: color 0.2s ease;
}

.faq-question:hover {
    color: var(--color-primary);
}

.faq-arrow {
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.faq-item.open .faq-arrow {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    padding: 0;
}

.faq-item.open .faq-answer {
    padding-bottom: 1.25rem;
}

/* ===== Tilt Effect ===== */
[data-tilt] {
    transform-style: preserve-3d;
    will-change: transform;
}

[data-tilt] > * {
    transform: translateZ(20px);
}

/* ===== Particle Canvas ===== */
#hero-particles,
#robotics-particles {
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

/* ===== Custom Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #667eea, #764ba2);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #5a67d8, #6b21a8);
}

/* Firefox scrollbar */
html {
    scrollbar-width: thin;
    scrollbar-color: #667eea #f1f1f1;
}

/* ===== Responsive Adjustments ===== */
@media (max-width: 768px) {
    .stat-number {
        font-size: 2.5rem;
    }

    .cta-button-fixed {
        bottom: 16px;
        right: 16px;
        padding: 0.75rem 1.25rem;
        font-size: 0.875rem;
    }

    /* Reduce motion for performance on mobile */
    [data-tilt] {
        transform: none !important;
    }
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    .gs-fade-up, .gs-fade-down, .gs-fade-left, .gs-fade-right,
    .gs-scale-in, .gs-stagger-item {
        opacity: 1;
        transform: none;
    }

    .scan-line,
    .cta-button-fixed {
        animation: none;
    }

    * {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}