/* ========================================
   HealU Landing Page
   A calming, organic design with soft depth
   ======================================== */

/* CSS Variables */
:root {
    /* Calming Indigo Palette */
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --primary-glow: rgba(99, 102, 241, 0.4);

    /* Teal Accents */
    --accent: #14b8a6;
    --accent-light: #5eead4;

    /* Neutrals */
    --bg: #fefefe;
    --bg-soft: #f8f7f4;
    --bg-card: #ffffff;
    --text: #1e1b4b;
    --text-muted: #6b7280;
    --text-light: #9ca3af;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;

    /* Typography */
    --font-display: 'Fraunces', Georgia, serif;
    --font-body: 'Outfit', -apple-system, sans-serif;

    /* Borders & Shadows */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 100px;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 24px 48px rgba(99, 102, 241, 0.15);
    --shadow-glow: 0 0 60px var(--primary-glow);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Ambient Background */
.ambient-bg {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, var(--accent), var(--primary));
    bottom: 20%;
    left: -100px;
    animation-delay: -7s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, var(--primary-dark), var(--accent-light));
    bottom: -100px;
    right: 20%;
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--space-sm) var(--space-md);
    background: rgba(254, 254, 254, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(99, 102, 241, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    text-decoration: none;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
}

.logo-text {
    font-family: var(--font-body);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
}

.logo-text .accent {
    color: var(--primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 0.95rem;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-md), 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-lg), 0 8px 30px var(--primary-glow);
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
}

.btn-primary:active {
    transform: translateY(0) scale(0.98);
}

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.btn-ghost:hover {
    background: var(--bg-soft);
    color: var(--primary);
    border-color: var(--primary-light);
    transform: translateY(-1px);
}

.btn-ghost:active {
    transform: translateY(0);
}

.btn-nav {
    background: var(--bg-soft);
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    border: 1px solid rgba(99, 102, 241, 0.2);
    box-shadow: var(--shadow-sm);
}

.btn-nav:hover {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white !important;
    border-color: transparent;
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-lg), 0 8px 30px var(--primary-glow);
}

.btn-nav:active {
    transform: translateY(0) scale(0.98);
}

/* Add glow effect to nav button like primary buttons */
.btn-nav::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    border-radius: inherit;
    opacity: 0;
    z-index: -1;
    transition: opacity 0.3s ease;
    filter: blur(8px);
}

.btn-nav:hover::before {
    opacity: 0.5;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: var(--space-xl);
    padding: calc(80px + var(--space-xl)) var(--space-md) var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.hero-content {
    max-width: 540px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.5rem 1rem;
    background: var(--bg-soft);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
    border: 1px solid rgba(99, 102, 241, 0.1);
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 600;
    line-height: 1.2;
    color: var(--text);
    margin-bottom: var(--space-md);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

.hero-cta {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* Phone Mockup */
.hero-visual {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.phone-mockup {
    position: relative;
}

.phone-frame {
    position: relative;
    width: 280px;
    height: 580px;
    background: linear-gradient(145deg, #1a1a2e, #16162a);
    border-radius: 40px;
    padding: 12px;
    box-shadow:
        0 50px 100px -20px rgba(0, 0, 0, 0.25),
        0 30px 60px -30px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    overflow: hidden;
}

.phone-screen {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top;
    border-radius: 28px;
    opacity: 0;
    position: absolute;
    top: 12px;
    left: 12px;
    width: calc(100% - 24px);
    height: calc(100% - 24px);
    transition: opacity 0.5s ease;
}

.phone-screen.active {
    opacity: 1;
}

.phone-glow {
    position: absolute;
    inset: -40px;
    background: radial-gradient(circle at center, var(--primary-glow), transparent 70%);
    z-index: -1;
    animation: glow-pulse 4s ease-in-out infinite;
}

@keyframes glow-pulse {
    0%, 100% { opacity: 0.6; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.05); }
}

.screenshot-dots {
    display: flex;
    gap: var(--space-xs);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text-light);
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    padding: 0;
}

.dot:hover {
    background: var(--primary-light);
}

.dot.active {
    background: var(--primary);
    width: 28px;
    border-radius: 5px;
}

/* Features Section */
.features {
    padding: var(--space-2xl) var(--space-md);
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-xl);
}

.section-tag {
    display: inline-block;
    padding: 0.4rem 0.8rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(20, 184, 166, 0.1));
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 600;
    color: var(--text);
    margin-bottom: var(--space-sm);
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-muted);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.feature-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    border: 1px solid rgba(99, 102, 241, 0.08);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(99, 102, 241, 0.15);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-highlight {
    grid-column: span 2;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(20, 184, 166, 0.08));
    border: 2px solid var(--primary-light);
}

.feature-span-2 {
    grid-column: span 2;
}

.feature-highlight .feature-icon {
    background: linear-gradient(135deg, var(--primary), var(--accent));
}

.feature-highlight .feature-icon svg {
    stroke: white;
}

.feature-highlight .feature-tag {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--bg-soft);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
}

.feature-icon svg {
    stroke: var(--primary);
}

.feature-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--text);
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.feature-tag {
    display: inline-block;
    margin-top: var(--space-sm);
    padding: 0.3rem 0.7rem;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

/* Privacy Section */
.privacy {
    padding: var(--space-2xl) var(--space-md);
    background: var(--bg-soft);
}

.privacy-container {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-xl);
    align-items: center;
}

.privacy-visual {
    display: flex;
    justify-content: center;
}

.shield {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
    animation: shield-float 6s ease-in-out infinite;
}

.shield svg {
    stroke: white;
}

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

.privacy-content {
    max-width: 500px;
}

.privacy-desc {
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

.privacy-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.privacy-list li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1rem;
    color: var(--text);
}

.privacy-list svg {
    flex-shrink: 0;
    stroke: var(--accent);
}

/* CTA Section */
.cta {
    padding: var(--space-2xl) var(--space-md);
}

.cta-container {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    padding: var(--space-xl);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(99, 102, 241, 0.1);
    overflow: hidden;
}

.cta-glow {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--primary-glow), transparent 70%);
    pointer-events: none;
}

.cta-title {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 600;
    color: var(--text);
    margin-bottom: var(--space-sm);
    position: relative;
}

.cta-desc {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: var(--space-lg);
    position: relative;
}

.cta .btn {
    position: relative;
}

/* Footer */
.footer {
    padding: var(--space-xl) var(--space-md);
    background: linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%);
    border-top: 1px solid rgba(99, 102, 241, 0.08);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    text-align: center;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
}

.footer-logo {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
}

.footer-tagline {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: var(--space-md);
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

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

.footer-copy {
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.6;
}

.footer-year {
    opacity: 0.7;
}

/* ========================================
   Responsive Styles
   ======================================== */

@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-xl);
    }

    .hero-content {
        max-width: 100%;
        order: 1;
    }

    .hero-visual {
        order: 0;
    }

    .hero-cta {
        justify-content: center;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .feature-highlight {
        grid-column: span 2;
    }

    .privacy-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    .privacy-list {
        align-items: center;
    }
}

@media (max-width: 768px) {
    :root {
        --space-xl: 3rem;
        --space-2xl: 4rem;
    }

    .nav-links a:not(.btn) {
        display: none;
    }

    .hero {
        padding-top: calc(70px + var(--space-lg));
        min-height: auto;
    }

    .hero-title {
        font-size: 2rem;
    }

    .phone-frame {
        width: 240px;
        height: 500px;
    }

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

    .feature-highlight,
    .feature-span-2 {
        grid-column: span 1;
    }

    .shield {
        width: 150px;
        height: 150px;
    }

    .shield svg {
        width: 80px;
        height: 80px;
    }
}

@media (max-width: 480px) {
    .hero-badge {
        font-size: 0.75rem;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

    .hero-cta .btn {
        width: 100%;
        justify-content: center;
    }

    .phone-frame {
        width: 200px;
        height: 420px;
        border-radius: 32px;
    }

    .feature-card {
        padding: var(--space-md);
    }

    .cta-container {
        padding: var(--space-lg) var(--space-md);
    }
}

/* ========================================
   Scroll Animations
   ======================================== */

/* Fade in up animation */
.animate-fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered children animation */
.stagger-children > * {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0.1s; }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.2s; }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.3s; }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.4s; }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.5s; }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.6s; }

.stagger-children.visible > * {
    opacity: 1;
    transform: translateY(0);
}

/* Scale in animation */
.animate-scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.animate-scale-in.visible {
    opacity: 1;
    transform: scale(1);
}

/* Slide in from left */
.animate-slide-left {
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-slide-left.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Slide in from right */
.animate-slide-right {
    opacity: 0;
    transform: translateX(40px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-slide-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Hero entrance animation */
.hero-content {
    animation: hero-enter 0.8s ease-out forwards;
}

.hero-visual {
    animation: hero-visual-enter 1s ease-out 0.3s forwards;
    opacity: 0;
}

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

@keyframes hero-visual-enter {
    from {
        opacity: 0;
        transform: translateY(60px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Button hover enhancement */
.btn {
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transform: translateX(-100%);
    transition: transform 0.5s ease;
}

.btn:hover::after {
    transform: translateX(100%);
}

/* Button content animation */
.btn span {
    transition: transform 0.3s ease, letter-spacing 0.3s ease;
    display: inline-block;
}

.btn:hover span {
    transform: translateX(-2px);
}

.btn svg {
    transition: transform 0.3s ease;
}

.btn:hover svg {
    transform: translateX(4px);
}

/* Subtle glow effect on primary buttons */
.btn-primary {
    position: relative;
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    border-radius: inherit;
    opacity: 0;
    z-index: -1;
    transition: opacity 0.3s ease;
    filter: blur(8px);
}

.btn-primary:hover::before {
    opacity: 0.5;
}

/* Feature card hover enhancements */
.feature-card {
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover {
    transform: translateY(-8px) scale(1.02);
}

.feature-card .feature-icon {
    transition: transform 0.4s ease;
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(-3deg);
}

/* Privacy shield animation enhancement */
.shield {
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.shield:hover {
    transform: translateY(-10px) scale(1.05);
    box-shadow: 0 0 80px var(--primary-glow);
}

/* CTA glow animation */
.cta-glow {
    animation: cta-glow-pulse 3s ease-in-out infinite;
}

@keyframes cta-glow-pulse {
    0%, 100% { opacity: 0.4; transform: translateX(-50%) scale(1); }
    50% { opacity: 0.7; transform: translateX(-50%) scale(1.1); }
}

/* Nav link underline animation */
.nav-links a:not(.btn) {
    position: relative;
}

.nav-links a:not(.btn)::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transition: width 0.3s ease;
}

.nav-links a:not(.btn):hover::after {
    width: 100%;
}

/* Phone mockup glow - continuous animation, no hover interruption */
.phone-glow {
    pointer-events: none;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    .orb,
    .phone-glow,
    .shield,
    .pulse-dot,
    .cta-glow {
        animation: none;
    }

    .animate-fade-in,
    .animate-scale-in,
    .animate-slide-left,
    .animate-slide-right,
    .stagger-children > * {
        opacity: 1;
        transform: none;
    }

    .hero-content,
    .hero-visual {
        animation: none;
        opacity: 1;
    }

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