/* ========================================
   AVIRO WEBSITE - CSS DESIGN SYSTEM
   ======================================== */

/* === CSS VARIABLES === */
:root {
    /* Colors */
    --color-bg-primary: #0a0a0a;
    --color-bg-secondary: #1a1a1a;
    --color-bg-card: rgba(255, 255, 255, 0.03);
    --color-text-primary: #ffffff;
    --color-text-secondary: #b0b0b0;
    --color-accent-primary: #ffffff;
    --color-accent-secondary: #888888;
    --color-accent-tertiary: #444444;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
    --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
    --gradient-glow: radial-gradient(circle at center, rgba(255, 255, 255, 0.15), transparent);

    /* Typography */
    --font-heading: 'Inter', sans-serif;
    --font-body: 'Inter', sans-serif;

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

    /* Effects */
    --blur-glass: blur(20px);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(255, 255, 255, 0.1);

    /* Transitions */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* === NAVIGATION === */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0.5rem 0;
    transition: var(--transition-smooth);
}

#navbar.scrolled {
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: var(--blur-glass);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

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

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

.nav-logo {
    height: 48px;
    width: auto;
    transition: var(--transition-smooth);
}

#navbar.scrolled .nav-logo {
    height: 36px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-sm);
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-smooth);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-smooth);
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

/* === HERO SECTION === */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: var(--spacing-xl) 0;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg-secondary);
    z-index: 0;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-text {
    animation: fadeInUp 1s ease-out;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-logo {
    width: 400px;
    height: auto;
    margin-bottom: 0.5rem;
    animation: fadeInUp 0.8s ease-out;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 5rem;
    font-weight: 300;
    line-height: 1.1;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #ffffff, var(--color-accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
    font-weight: 300;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: var(--color-accent-tertiary);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 20px rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: var(--transition-smooth);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(255, 255, 255, 0.2);
}

.cta-button:hover::before {
    left: 100%;
}



.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-left: 2px solid var(--color-accent-secondary);
    border-bottom: 2px solid var(--color-accent-secondary);
    transform: rotate(-45deg);
    margin: 10px auto 0;
}

/* === SECTION STYLES === */
section {
    padding: var(--spacing-xl) 0;
    position: relative;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 3rem;
    text-align: center;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, #ffffff, var(--color-accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* === MISSION SECTION === */
.mission {
    background: linear-gradient(180deg, var(--color-bg-primary), var(--color-bg-secondary));
}

.mission-statement {
    font-size: 1.3rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

/* === PROBLEM SECTION === */
.problem {
    background: var(--color-bg-primary);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.problem-card {
    background: var(--gradient-card);
    backdrop-filter: var(--blur-glass);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: var(--spacing-md);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.problem-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition-smooth);
}

.problem-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow);
    border-color: var(--color-accent-secondary);
}

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

.card-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    filter: grayscale(1);
}

.problem-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.problem-card p {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* === METHODOLOGY SECTION === */
.methodology {
    background: linear-gradient(180deg, var(--color-bg-primary), var(--color-bg-secondary));
}

.methodology-timeline {
    display: grid;
    grid-template-columns: 1fr auto 1fr auto 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    align-items: center;
}

.phase-card {
    background: var(--gradient-card);
    backdrop-filter: var(--blur-glass);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: var(--spacing-md);
    transition: var(--transition-smooth);
    position: relative;
    cursor: pointer;
}

.phase-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow);
    border-color: var(--color-accent-secondary);
}

.phase-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.phase-number {
    width: clamp(40px, 8vw, 60px);
    height: clamp(40px, 8vw, 60px);
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(1.2rem, 3vw, 2rem);
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: var(--shadow-glow);
}

.phase-card h3 {
    font-size: clamp(1.4rem, 4vw, 1.8rem);
    color: var(--color-text-primary);
    margin-bottom: 0;
}

.phase-toggle {
    margin-left: auto;
    width: 20px;
    height: 20px;
    position: relative;
    transition: var(--transition-smooth);
}

.phase-toggle::before,
.phase-toggle::after {
    content: '';
    position: absolute;
    background: var(--color-accent-secondary);
    transition: var(--transition-smooth);
}

.phase-toggle::before {
    width: 2px;
    height: 100%;
    left: 50%;
    transform: translateX(-50%);
}

.phase-toggle::after {
    width: 100%;
    height: 2px;
    top: 50%;
    transform: translateY(-50%);
}

.phase-card.expanded .phase-toggle {
    transform: rotate(45deg);
}

.phase-card.expanded .phase-toggle::before {
    background: #ffffff;
}

.phase-card.expanded .phase-toggle::after {
    background: #ffffff;
}

.phase-description {
    color: var(--color-accent-secondary);
    font-weight: 600;
    margin-bottom: 0;
    transition: var(--transition-smooth);
}

.phase-card.expanded .phase-description {
    margin-bottom: var(--spacing-sm);
}

.phase-details-container {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0, 1, 0, 1);
}

.phase-card.expanded .phase-details-container {
    max-height: 1000px;
    /* Large enough value */
    transition: max-height 1s ease-in-out;
}

.phase-details {
    color: var(--color-text-secondary);
    line-height: 1.8;
    padding-top: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.detail-item {
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    padding: var(--spacing-sm);
    transition: var(--transition-smooth);
}

.detail-item:hover {
    background: rgba(255, 255, 255, 0.06);
}

.detail-header {
    font-weight: 700;
    color: var(--color-text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    position: relative;
    padding-left: 20px;
    transition: var(--transition-smooth);
}

.detail-header::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent-secondary);
    transition: var(--transition-smooth);
}

.detail-item.active .detail-header {
    color: var(--color-accent-secondary);
}

.detail-item.active .detail-header::before {
    transform: rotate(90deg);
}

.detail-content {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0, 1, 0, 1), opacity 0.3s ease;
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    padding-left: 20px;
}

.detail-item.active .detail-content {
    max-height: 200px;
    opacity: 1;
    transition: max-height 0.6s ease-in-out, opacity 0.4s ease;
    padding-top: 0.5rem;
}

.phase-details li {
    margin-bottom: var(--spacing-xs);
    padding-left: var(--spacing-sm);
    position: relative;
}

.phase-details li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent-secondary);
}

.phase-connector {
    width: 60px;
    height: 4px;
    background: var(--color-accent-secondary);
    position: relative;
    border-radius: 2px;
}

.phase-connector::after {
    content: '';
    position: absolute;
    right: -2px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-top: 8px solid transparent;
    border-bottom: 8px solid transparent;
    border-left: 12px solid var(--color-accent-secondary);
}

/* === FOCUS AREAS SUB-SECTION === */
.focus-areas {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.subsection-title {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
}

.focus-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-md);
}

.focus-item {
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: var(--spacing-md);
    text-align: center;
    transition: var(--transition-smooth);
}

.focus-item:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--color-accent-secondary);
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow);
}

.focus-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    filter: grayscale(1);
    opacity: 0.8;
    transition: var(--transition-smooth);
}

.focus-item:hover .focus-icon {
    filter: grayscale(0);
    opacity: 1;
    transform: scale(1.1);
}

.focus-item h4 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.focus-item p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* === OUTCOMES SECTION === */
.outcomes {
    background: var(--color-bg-primary);
}

.outcomes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.outcome-card {
    background: var(--gradient-card);
    backdrop-filter: var(--blur-glass);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: var(--spacing-md);
    text-align: center;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.outcome-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: var(--gradient-glow);
    opacity: 0;
    transition: var(--transition-smooth);
}

.outcome-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow);
    border-color: var(--color-accent-secondary);
}

.outcome-card:hover::before {
    opacity: 0.3;
}

.outcome-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
    position: relative;
    z-index: 1;
    filter: grayscale(1);
}

.outcome-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
    position: relative;
    z-index: 1;
}

.outcome-card p {
    color: var(--color-text-secondary);
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

/* === CONTACT SECTION === */
.contact {
    background: linear-gradient(180deg, var(--color-bg-primary), var(--color-bg-secondary));
    padding: var(--spacing-xl) 0;
}

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

.contact-content h2 {
    font-family: var(--font-heading);
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, #ffffff, var(--color-accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.contact-content p {
    font-size: 1.3rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.cta-button-large {
    display: inline-block;
    padding: 1.2rem 3rem;
    background: var(--color-accent-tertiary);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.2rem;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 20px rgba(255, 255, 255, 0.1);
}

.cta-button-large:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 10px 40px rgba(255, 255, 255, 0.2);
}

/* === FOOTER === */
.footer {
    background: var(--color-bg-primary);
    padding: var(--spacing-md) 0;
    text-align: center;
    color: var(--color-text-secondary);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-20px);
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 0.6;
    }

    50% {
        opacity: 1;
    }
}

@keyframes rotate3d {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

@keyframes bounce {

    0%,
    100% {
        transform: translateX(-50%) translateY(0);
    }

    50% {
        transform: translateX(-50%) translateY(-10px);
    }
}

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

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

/* === RESPONSIVE DESIGN === */
@media (max-width: 968px) {
    .hero-title {
        font-size: 3.5rem;
    }

    .hero-logo {
        width: 350px;
    }

    .methodology-timeline {
        grid-template-columns: 1fr;
    }

    .phase-connector {
        width: 4px;
        height: 60px;
        margin: var(--spacing-sm) auto;
    }

    .phase-connector::after {
        right: 50%;
        top: auto;
        bottom: -2px;
        transform: translateX(50%);
        border-left: 8px solid transparent;
        border-right: 8px solid transparent;
        border-top: 12px solid var(--color-accent-secondary);
    }

    .nav-links {
        gap: var(--spacing-sm);
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 8vw;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-logo {
        width: 300px;
    }

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

    .nav-links {
        display: none;
    }

    .problem-grid,
    .outcomes-grid {
        grid-template-columns: 1fr;
    }
}