/* SEREIN BROWSER - CLEAN LANDING PAGE */

:root {
    --bg-primary: #0f0f0f;
    --bg-surface: #1a1a1a;
    --accent-primary: #9d7cd8;
    --accent-secondary: #7aa2f7;
    --text-primary: #f5f5f5;
    --text-secondary: #b8b8b8;
    --border-color: #2a2a2a;
    --space-xs: 4px;
    --space-sm: 8px;
    --space-base: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
}

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

html, body {
    width: 100%;
    height: 100%;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
}

/* === STARTUP OVERLAY & ANIMATION === */
.startup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    z-index: 9999;
    pointer-events: all;
}

.startup-overlay.fade-out {
    animation: overlayFadeOut 0.4s ease-out forwards;
    pointer-events: none;
}

@keyframes overlayFadeOut {
    0% { opacity: 1; }
    100% { opacity: 0; }
}

.startup-logo {
    width: 320px;
    height: 320px;
}

/* === MAIN CONTENT === */
main {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: auto;
    width: 100%;
    padding: 0;
}

main.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

main.show {
    animation: mainFadeIn 0.5s ease-out forwards;
}

@keyframes mainFadeIn {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

@keyframes fadeInUp {
    0% { opacity: 0; transform: translateY(8px); }
    100% { opacity: 1; transform: translateY(0); }
}

/* === HERO SECTION === */
.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
    text-align: center;
    padding: var(--space-2xl) var(--space-lg) var(--space-2xl);
    max-width: 728px;
    margin: 0 auto 0;
    opacity: 0;
}

.hero.show {
    animation: fadeInUp 0.4s ease-out forwards;
}

.logo {
    width: 120px;
    height: 120px;
    object-fit: contain;
}

h1 {
    font-size: 56px;
    font-weight: 700;
    letter-spacing: -1px;
    text-align: center;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.tagline {
    font-size: 20px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: var(--space-lg) 0 0;
    max-width: 500px;
}

/* === VALUES SECTION === */
.values {
    width: 100%;
    background-color: var(--bg-surface);
    padding: var(--space-2xl) var(--space-lg);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    opacity: 0;
}

.values.show {
    animation: fadeInUp 0.4s ease-out forwards;
}

.value-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--space-2xl);
    max-width: 728px;
    margin: 0 auto;
}

.value-block {
    display: flex;
    flex-direction: column;
    gap: var(--space-base);
    text-align: center;
}

.value-label {
    font-size: 18px;
    font-weight: 600;
    color: var(--accent-primary);
    letter-spacing: -0.3px;
}

.value-block p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* === HOW IT WORKS SECTION === */
.how-it-works {
    width: 100%;
    padding: var(--space-2xl) var(--space-lg);
    max-width: none;
    opacity: 0;
}

.how-it-works.show {
    animation: fadeInUp 0.4s ease-out forwards;
}

.how-it-works h2 {
    text-align: center;
    font-size: 28px;
    font-weight: 600;
    margin-bottom: var(--space-2xl);
    color: var(--text-primary);
}

.steps {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--space-xl);
    max-width: 728px;
    margin: 0 auto;
}

.step {
    display: flex;
    flex-direction: column;
    gap: var(--space-base);
}

.step-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 600;
    color: var(--accent-primary);
}

.step-content h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.step-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* === WHY SEREIN SECTION === */
.why-serein {
    width: 100%;
    background-color: var(--bg-surface);
    padding: var(--space-2xl) var(--space-lg);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    opacity: 0;
}

.why-serein.show {
    animation: fadeInUp 0.4s ease-out forwards;
}

.why-serein h2 {
    text-align: center;
    font-size: 28px;
    font-weight: 600;
    margin-bottom: var(--space-2xl);
    color: var(--text-primary);
}

.reason-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    max-width: 728px;
    margin: 0 auto;
}

.reason {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.reason-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--accent-secondary);
}

.reason p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* === FEATURES SECTION === */
.features {
    width: 100%;
    padding: var(--space-2xl) var(--space-lg);
    opacity: 0;
}

.features.show {
    animation: fadeInUp 0.4s ease-out forwards;
}

.features h2 {
    text-align: center;
    font-size: 28px;
    font-weight: 600;
    margin-bottom: var(--space-2xl);
    color: var(--text-primary);
}

.feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    max-width: 728px;
    margin: 0 auto;
}

.feature {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.feature h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.feature p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* === HALL OF SHAME SECTION === */
.hall-of-shame {
    width: 100%;
    padding: var(--space-2xl) var(--space-lg);
    opacity: 0;
}

.hall-of-shame.show {
    animation: fadeInUp 0.4s ease-out forwards;
}

.hall-of-shame h2 {
    text-align: center;
    font-size: 28px;
    font-weight: 600;
    margin-bottom: var(--space-base);
    color: var(--text-primary);
}

.shame-intro {
    text-align: center;
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.shame-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.shame-card {
    display: flex;
    flex-direction: column;
    gap: var(--space-base);
    text-align: center;
    padding: var(--space-lg);
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    transition: border-color 100ms ease, opacity 100ms ease;
}

.shame-card:hover {
    border-color: var(--accent-primary);
    opacity: 0.9;
}

.shame-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto;
}

.shame-card h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.shame-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

/* === CALL TO ACTION SECTION === */
.call-to-action {
    width: 100%;
    padding: var(--space-2xl) var(--space-lg);
    text-align: center;
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    opacity: 0;
}

.call-to-action.show {
    animation: fadeInUp 0.4s ease-out forwards;
}

.call-to-action h2 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.call-to-action button {
    margin-bottom: var(--space-lg);
}

.cta-note {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 0;
}

.button {
    padding: 12px 28px;
    border: 1px solid var(--accent-primary);
    border-radius: 4px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 100ms ease-out;
    font-family: inherit;
    background: transparent;
    color: var(--accent-primary);
}

.button-primary {
    background: var(--accent-primary);
    color: var(--bg-primary);
    border-color: var(--accent-primary);
}

.button-primary:hover {
    opacity: 0.85;
    transform: translateY(-1px);
}

.button-primary:active {
    opacity: 0.75;
    transform: translateY(0);
}

/* === FOOTER === */
footer {
    width: 100%;
    padding: var(--space-2xl) var(--space-lg);
    text-align: center;
    color: var(--text-secondary);
    font-size: 13px;
    opacity: 0;
    border-top: 1px solid var(--border-color);
}

footer.show {
    animation: fadeInUp 0.4s ease-out forwards;
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    h1 {
        font-size: 42px;
    }

    .tagline {
        font-size: 18px;
    }

    .how-it-works h2,
    .why-serein h2,
    .features h2,
    .call-to-action h2 {
        font-size: 24px;
    }

    .value-row {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .steps {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .feature-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .hero {
        padding: var(--space-xl) var(--space-base) var(--space-xl);
    }

    .values {
        padding: var(--space-xl) var(--space-base);
    }

    .how-it-works {
        padding: var(--space-xl) var(--space-base);
    }

    .why-serein {
        padding: var(--space-xl) var(--space-base);
    }

    .features {
        padding: var(--space-xl) var(--space-base);
    }

    .call-to-action {
        padding: var(--space-xl) var(--space-base);
    }

    footer {
        padding: var(--space-xl) var(--space-base);
    }

    .startup-logo {
        width: 240px;
        height: 240px;
    }

    .logo {
        width: 100px;
        height: 100px;
    }
}

@media (max-width: 640px) {
    h1 {
        font-size: 36px;
    }

    .tagline {
        font-size: 16px;
    }

    .how-it-works h2,
    .why-serein h2,
    .features h2,
    .call-to-action h2 {
        font-size: 20px;
    }

    .step-number {
        width: 36px;
        height: 36px;
        font-size: 16px;
    }

    .step-content h3 {
        font-size: 15px;
    }

    .step-content p {
        font-size: 13px;
    }

    .value-block p {
        font-size: 13px;
    }

    .reason-title {
        font-size: 15px;
    }

    .reason p {
        font-size: 13px;
    }

    .feature h4 {
        font-size: 14px;
    }

    .feature p {
        font-size: 12px;
    }

    .hero {
        padding: var(--space-lg) var(--space-base) var(--space-lg);
    }

    .values {
        padding: var(--space-lg) var(--space-base);
    }

    .how-it-works {
        padding: var(--space-lg) var(--space-base);
    }

    .why-serein {
        padding: var(--space-lg) var(--space-base);
    }

    .features {
        padding: var(--space-lg) var(--space-base);
    }

    .call-to-action {
        padding: var(--space-lg) var(--space-base);
    }

    footer {
        padding: var(--space-lg) var(--space-base);
        font-size: 12px;
    }

    .startup-logo {
        width: 200px;
        height: 200px;
    }

    .logo {
        width: 80px;
        height: 80px;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}