/* 
   KYVI - Design System (Clean Light Mode) 
   Identity: Modern Warm - Soft UI Evolution
*/

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Poppins:wght@500;600;700;800&display=swap');

:root {
    /* Brand Colors */
    --primary: #FF6D3F;
    /* Vibrant Orange */
    --primary-dark: #E05A2F;
    --primary-soft: #FFF0EB;

    --secondary: #1B2A4A;
    /* Navy Blue */
    --secondary-light: #2D4373;

    /* Module Colors */
    --color-forum: #FF6D3F;
    --color-docs: #14B8A6;
    --color-housing: #10B981;
    --color-work: #6366F1;
    --color-edu: #8B5CF6;

    /* UI Palette - Light Clean */
    --bg-main: #FFFFFF;
    --bg-surface: #F8F9FB;
    --bg-accent: #F1F5F9;

    --text-main: #1A1D26;
    --text-muted: #5A6178;
    --border: #E2E6ED;

    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    --shadow-sm: 0 1px 3px rgba(27, 42, 74, 0.1);
    --shadow-md: 0 10px 15px -3px rgba(27, 42, 74, 0.08);
    --shadow-lg: 0 20px 25px -5px rgba(27, 42, 74, 0.1);

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
.logo {
    font-family: 'Poppins', sans-serif;
    color: var(--secondary);
}

.container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* --- Utilities --- */
.gradient-text {
    background: linear-gradient(135deg, var(--primary), #F5A623);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    gap: 0.75rem;
    font-family: 'Poppins', sans-serif;
    color: #FFFFFF;
    /* Base color for buttons */
}

.btn-primary {
    background: var(--primary);
    color: #FFFFFF;
    box-shadow: 0 8px 20px -6px rgba(255, 109, 63, 0.4);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 12px 25px -8px rgba(255, 109, 63, 0.5);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--secondary);
}

.btn-outline:hover {
    background: var(--bg-surface);
    border-color: var(--secondary);
    transform: translateY(-2px);
}

/* --- Navigation --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 0;
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.brand-logo {
    height: 32px;
    width: auto;
    display: block;
}

.footer-logo-img {
    height: 40px;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

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

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

/* Language Switcher */
.lang-switcher {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-surface);
    padding: 0.4rem 0.75rem;
    border-radius: 2rem;
    border: 1px solid var(--border);
}

.lang-btn {
    background: none;
    border: none;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
}

.lang-btn.active {
    color: var(--primary);
}

.lang-btn:hover:not(.active) {
    color: var(--secondary);
}

.lang-divider {
    color: var(--border);
    font-size: 0.75rem;
}

.nav-btn {
    padding: 0.6rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    color: #FFFFFF !important;
}

.nav-btn:hover {
    transform: translateY(-1px) scale(1.02);
}

.btn-store {
    background: #FFFFFF;
    color: var(--secondary) !important;
    padding: 0.875rem 1.75rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    min-width: 180px;
    border: 1px solid var(--border);
    transition: all 0.2s ease;
}

.btn-store:hover {
    background: var(--bg-surface);
    border-color: var(--secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.nav-extra {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--secondary);
    padding: 0.5rem;
}

/* --- Hero Section --- */
.hero {
    padding: 120px 0 80px;
    min-height: 90vh;
    display: flex;
    align-items: center;
    background: radial-gradient(circle at 90% 10%, var(--primary-soft) 0%, transparent 40%);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
    max-width: 540px;
}

.hero-buttons {
    display: flex;
    gap: 1.25rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.hero-visual {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    aspect-ratio: 4/5;
}

/* Placeholder for Emotion Hero Image */
.emotion-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: #E5E7EB;
    /* Light gray loading state */
}

/* --- Section Shared --- */
section {
    padding: 100px 0;
}

.section-tag {
    color: var(--primary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.85rem;
    display: block;
    margin-bottom: 1rem;
    text-align: center;
}

.section-title {
    font-size: 2.75rem;
    text-align: center;
    margin-bottom: 1rem;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    max-width: 650px;
    margin: 0 auto 4rem auto;
    font-size: 1.125rem;
}

/* --- Step-by-Step (The Journey) --- */
.journey-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    position: relative;
}

/* Timeline line decoration */
.journey-grid::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 10%;
    right: 10%;
    height: 2px;
    background: var(--border);
    z-index: 1;
}

.step-card {
    text-align: center;
    position: relative;
    z-index: 2;
}

.step-number {
    width: 80px;
    height: 80px;
    background: var(--bg-main);
    border: 2px solid var(--border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    transition: var(--transition);
}

.step-card:hover .step-number {
    border-color: var(--primary);
    background: var(--primary-soft);
    transform: scale(1.1);
}

.step-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.step-card p {
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* --- Bento Grid (Features) --- */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 320px);
    gap: 1.5rem;
}

.bento-card {
    background: var(--bg-surface);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: var(--transition);
    border: 1px solid var(--border);
}

.bento-card:hover {
    background: #fff;
    box-shadow: var(--shadow-lg);
    border-color: transparent;
    transform: translateY(-8px);
}

.bento-card.wide {
    grid-column: span 2;
}

.bento-card.tall {
    grid-row: span 2;
}

.feat-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    margin-bottom: 1.5rem;
}

.feat-forum {
    background: var(--color-forum);
}

.feat-housing {
    background: var(--color-housing);
}

.feat-docs {
    background: var(--color-docs);
}

.feat-work {
    background: var(--color-work);
}

.feat-edu {
    background: var(--color-edu);
}

/* --- CTA Banner --- */
.cta {
    margin: 80px 0;
}

.cta-box {
    background: var(--secondary);
    border-radius: var(--radius-xl);
    padding: 5rem;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.cta-box h2 {
    color: #fff;
    font-size: 3rem;
    margin-bottom: 1rem;
}

.cta-box p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 3rem;
    font-size: 1.25rem;
}

/* --- Footer --- */
footer {
    padding: 80px 0 40px;
    background: var(--bg-surface);
    border-top: 1px solid var(--border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-info p {
    color: var(--text-muted);
    margin-top: 1rem;
    max-width: 300px;
}

.footer-col h4 {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

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

.footer-col ul li {
    margin-bottom: 0.75rem;
}

.footer-col ul a {
    text-decoration: none;
    color: var(--text-muted);
    transition: color 0.2s;
}

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

.disabled-link {
    cursor: not-allowed;
    opacity: 0.6;
}

.disabled-link:hover {
    color: var(--text-muted) !important;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content h1 {
        font-size: 3rem;
    }

    .hero-content p {
        margin: 0 auto 3rem;
    }

    .hero-buttons {
        justify-content: center;
        gap: 1rem;
    }

    .hero-visual {
        max-width: 500px;
        margin: 0 auto;
    }

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

    .journey-grid::before {
        display: none;
    }

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

@media (max-width: 768px) {
    .lang-divider {
        display: none;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: white;
        flex-direction: column;
        justify-content: center;
        gap: 2rem;
        padding: 2rem;
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.1);
        transition: right 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        z-index: 999;
        display: flex;
        /* Keep as flex but hide using right: -100% */
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links a {
        font-size: 1.25rem;
        color: var(--secondary);
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
        max-width: 320px;
        margin: 2rem auto 0;
        gap: 1rem;
    }

    .hero-buttons .btn {
        width: 100%;
    }

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

    .bento-grid {
        display: flex;
        flex-direction: column;
    }

    .bento-card.wide,
    .bento-card.tall {
        grid-column: auto;
        grid-row: auto;
    }

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

    /* CTA Section Mobile Fix */
    .cta-box {
        padding: 3.5rem 1.5rem;
    }

    .cta-box h2 {
        font-size: 2.25rem;
        line-height: 1.2;
    }

    .cta-box p {
        font-size: 1.1rem;
        margin-bottom: 2.5rem;
    }

    .btn-store {
        width: 100%;
        justify-content: center;
        padding: 1rem;
    }
}

/* --- Waitlist Modal --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(27, 42, 74, 0.4);
    backdrop-filter: blur(8px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    padding: 1.5rem;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    display: flex;
    opacity: 1;
}

.modal-card {
    background: white;
    padding: 3rem 2.5rem;
    border-radius: var(--radius-lg);
    max-width: 480px;
    width: 100%;
    position: relative;
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.15);
    transform: translateY(20px);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active .modal-card {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.5rem;
    transition: color 0.2s;
}

.modal-close:hover {
    color: var(--secondary);
}

.modal-header {
    text-align: center;
    margin-bottom: 2rem;
}

.modal-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.modal-header h2 {
    font-size: 1.75rem;
    margin-bottom: 0.75rem;
    color: var(--secondary);
}

.modal-header p {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.6;
}

.waitlist-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--secondary);
}

.input-group input[type="email"] {
    padding: 0.875rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color 0.2s;
}

.input-group input[type="email"]:focus {
    outline: none;
    border-color: var(--primary);
}

.radio-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 0.25rem;
}

.radio-item {
    cursor: pointer;
}

.radio-item input {
    display: none;
}

.radio-item span {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-weight: 500;
    color: var(--text-muted);
    transition: all 0.2s;
}

.radio-item input:checked+span {
    background: var(--bg-surface);
    border-color: var(--secondary);
    color: var(--secondary);
}

.form-status {
    text-align: center;
    font-size: 0.9rem;
    margin-top: 0.5rem;
    min-height: 1.4em;
}

.form-status.success {
    color: #10b981;
}

.form-status.error {
    color: #ef4444;
}