/* Smart Sensor Landing Page Styles */

/* ============================================
   CSS Variables
   ============================================ */
:root {
    /* Primary Colors */
    --primary: #2563EB;
    --primary-hover: #1D4ED8;
    --primary-light: #EFF6FF;

    /* Accent Colors */
    --success: #22C55E;
    --success-light: #DCFCE7;
    --purple: #8B5CF6;
    --purple-light: #F5F3FF;
    --red: #EF4444;
    --red-light: #FEE2E2;
    --cyan: #06B6D4;
    --cyan-light: #ECFEFF;
    --yellow: #F59E0B;
    --yellow-light: #FEF3C7;

    /* Neutrals */
    --text-primary: #111827;
    --text-secondary: #4B5563;
    --text-muted: #9CA3AF;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --border: #E5E7EB;

    /* Gradients */
    --gradient-hero: linear-gradient(135deg, #EFF6FF 0%, #ECFDF5 50%, #F0F9FF 100%);
    --gradient-cta: linear-gradient(135deg, #2563EB 0%, #7C3AED 100%);
    --gradient-text: linear-gradient(135deg, #2563EB, #06B6D4);

    /* Spacing */
    --container-max: 1200px;
    --section-padding: 5rem;

    /* Transitions */
    --transition-fast: 0.15s ease-out;
    --transition-normal: 0.3s ease-out;
    --transition-slow: 0.5s ease-out;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
}

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

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

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Scroll reveal animation */
.reveal-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Float animation class */
.float-animation {
    animation: float 6s ease-in-out infinite;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(229, 231, 235, 0.5);
    transition: var(--transition-normal);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary);
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.btn-nav {
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    background: var(--primary-light);
    border-radius: 8px;
    transition: var(--transition-fast);
}

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

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    padding: 8rem 1.5rem 4rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 3rem;
    background: var(--gradient-hero);
    background-size: 200% 200%;
    animation: gradientShift 15s ease infinite;
}

.hero-content {
    max-width: 700px;
    text-align: center;
    animation: fadeInUp 0.8s ease-out;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    background: white;
    border-radius: 50px;
    box-shadow: var(--shadow-md);
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 550px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: var(--gradient-cta);
    border-radius: 10px;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
    transition: var(--transition-fast);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
}

.btn-icon {
    width: 18px;
    height: 18px;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    background: white;
    border: 2px solid var(--border);
    border-radius: 10px;
    transition: var(--transition-fast);
}

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

/* Hero Visual Card */
.hero-visual {
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-card {
    background: white;
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border);
    width: 300px;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

.card-metrics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.metric {
    text-align: center;
}

.metric-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.metric-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-insight {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background: var(--success-light);
    border-radius: 8px;
    font-size: 0.875rem;
    color: #166534;
}

.insight-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

/* ============================================
   Features Section
   ============================================ */
.features {
    padding: var(--section-padding) 1.5rem;
    background: var(--bg-primary);
}

.section-container {
    max-width: var(--container-max);
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.feature-card {
    padding: 1.75rem;
    background: white;
    border: 2px solid var(--border);
    border-radius: 16px;
    transition: var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    margin-bottom: 1rem;
}

.feature-icon svg {
    width: 24px;
    height: 24px;
}

.feature-icon.blue {
    background: var(--primary-light);
    color: var(--primary);
}

.feature-icon.purple {
    background: var(--purple-light);
    color: var(--purple);
}

.feature-icon.red {
    background: var(--red-light);
    color: var(--red);
}

.feature-icon.green {
    background: var(--success-light);
    color: var(--success);
}

.feature-icon.cyan {
    background: var(--cyan-light);
    color: var(--cyan);
}

.feature-icon.yellow {
    background: var(--yellow-light);
    color: var(--yellow);
}

.feature-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.feature-desc {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   How It Works Section
   ============================================ */
.how-it-works {
    padding: var(--section-padding) 1.5rem;
    background: var(--bg-secondary);
}

.steps-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 1.25rem;
    padding: 1.5rem;
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    width: 100%;
    max-width: 400px;
}

.step-number {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-cta);
    color: white;
    font-size: 1.125rem;
    font-weight: 700;
    border-radius: 12px;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.step-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.step-connector {
    width: 2px;
    height: 24px;
    background: linear-gradient(180deg, var(--primary) 0%, var(--purple) 100%);
    border-radius: 1px;
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    padding: var(--section-padding) 1.5rem;
    background: var(--gradient-cta);
}

.cta-container {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.cta-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    color: white;
    margin-bottom: 1rem;
}

.cta-subtitle {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 2rem;
}

.btn-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary);
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
    transition: var(--transition-fast);
}

.btn-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 3rem 1.5rem;
    background: var(--text-primary);
    color: white;
}

.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    text-align: center;
}

.footer .logo-icon {
    color: white;
}

.footer .logo-text {
    background: linear-gradient(135deg, #60A5FA, #34D399);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-tagline {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.875rem;
}

.footer-links a {
    color: var(--text-muted);
    transition: var(--transition-fast);
}

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

.footer-links .divider {
    color: #374151;
}

.footer-copy {
    font-size: 0.75rem;
    color: #6B7280;
}

/* ============================================
   Responsive Design
   ============================================ */

/* Tablet (768px+) */
@media (min-width: 768px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero {
        flex-direction: row;
        padding: 8rem 2rem 4rem;
        gap: 4rem;
    }

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

    .hero-cta {
        justify-content: flex-start;
    }

    .steps-container {
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
        gap: 0;
    }

    .step {
        max-width: 250px;
    }

    .step-connector {
        width: 40px;
        height: 2px;
        align-self: center;
    }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .hero {
        padding: 0 4rem;
    }

    .hero-card {
        width: 340px;
    }

    .step {
        max-width: 220px;
    }

    .footer-container {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }

    .footer-brand {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Large Desktop (1280px+) */
@media (min-width: 1280px) {
    .hero {
        gap: 6rem;
    }

    .hero-content {
        max-width: 600px;
    }
}

/* Stagger animation for feature cards on scroll */
.features-grid .feature-card:nth-child(1) { transition-delay: 0s; }
.features-grid .feature-card:nth-child(2) { transition-delay: 0.1s; }
.features-grid .feature-card:nth-child(3) { transition-delay: 0.2s; }
.features-grid .feature-card:nth-child(4) { transition-delay: 0.3s; }
.features-grid .feature-card:nth-child(5) { transition-delay: 0.4s; }
.features-grid .feature-card:nth-child(6) { transition-delay: 0.5s; }

/* Stagger animation for steps */
.steps-container .step:nth-child(1) { transition-delay: 0s; }
.steps-container .step:nth-child(3) { transition-delay: 0.15s; }
.steps-container .step:nth-child(5) { transition-delay: 0.3s; }
.steps-container .step:nth-child(7) { transition-delay: 0.45s; }