/* ===== CSS Variables ===== */
:root {
    --primary: #2563EB;
    --primary-dark: #1E40AF;
    --secondary: #10B981;
    --text: #111827;
    --text-light: #6B7280;
    --bg-light: #F3F4F6;
    --bg-white: #FFFFFF;
    --bg-dark: #111827;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

/* ===== Utility ===== */
.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
}

.section__title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section__title--light {
    color: #FFFFFF;
}

.section__subtitle {
    font-size: 1.125rem;
    color: var(--text-light);
    text-align: center;
    margin-bottom: 60px;
}

.section__subtitle--light {
    color: rgba(255, 255, 255, 0.7);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn--primary {
    background: var(--primary);
    color: #fff;
}

.btn--primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.3);
}

.btn--outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn--outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #fff;
}

.btn--lg {
    padding: 16px 40px;
    font-size: 1.1rem;
}

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
}

.nav--scrolled {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    padding: 12px 0;
    box-shadow: var(--shadow);
}

.nav__container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav__logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
    transition: var(--transition);
}

.nav__logo-img {
    height: 32px;
    width: auto;
    filter: brightness(0) invert(1);
    transition: var(--transition);
}

.nav--scrolled .nav__logo-text {
    color: var(--primary);
}

.nav--scrolled .nav__logo-img {
    filter: none;
}

.nav__menu {
    display: flex;
    gap: 36px;
}

.nav__link {
    font-size: 0.95rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.85);
    transition: var(--transition);
}

.nav--scrolled .nav__link {
    color: var(--text);
}

.nav__link:hover {
    color: var(--primary);
}

.nav__cta {
    padding: 10px 24px;
    background: var(--primary);
    color: #fff;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition);
}

.nav__cta:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.nav__hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav__hamburger span {
    width: 24px;
    height: 2px;
    background: #fff;
    transition: var(--transition);
}

.nav--scrolled .nav__hamburger span {
    background: var(--text);
}

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0F172A 0%, #1E3A5F 50%, #1E40AF 100%);
    padding: 120px 24px 80px;
    text-align: center;
}

.hero__container {
    max-width: 800px;
}

.hero__title {
    font-size: 3.5rem;
    font-weight: 800;
    color: #fff;
    line-height: 1.2;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.hero__subtitle {
    font-size: 1.35rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 48px;
    font-weight: 400;
}

.hero__cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.hero__badges {
    display: flex;
    gap: 32px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero__badge {
    display: flex;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

/* ===== Value Section ===== */
.value {
    padding: 120px 0;
    background: var(--bg-white);
}

.value__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.value__card {
    padding: 40px 32px;
    border-radius: var(--radius-lg);
    background: var(--bg-white);
    border: 1px solid #E5E7EB;
    transition: var(--transition);
}

.value__card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.value__icon {
    margin-bottom: 24px;
}

.value__title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.value__desc {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ===== Features Section ===== */
.features {
    padding: 120px 0;
    background: var(--bg-light);
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.features__card {
    padding: 32px;
    background: var(--bg-white);
    border-radius: var(--radius);
    transition: var(--transition);
    border: 1px solid transparent;
}

.features__card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.features__card-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-light);
    border-radius: 12px;
    margin-bottom: 20px;
}

.features__card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.features__card p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* ===== Detail Section ===== */
.detail {
    padding: 120px 0;
    background: var(--bg-white);
}

.detail__item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    margin-bottom: 120px;
}

.detail__item:last-child {
    margin-bottom: 0;
}

.detail__item--reverse {
    direction: rtl;
}

.detail__item--reverse > * {
    direction: ltr;
}

.detail__label {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    background: #EFF6FF;
    padding: 6px 14px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.detail__title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.detail__desc {
    color: var(--text-light);
    margin-bottom: 24px;
    line-height: 1.8;
}

.detail__list {
    list-style: none;
}

.detail__list li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 12px;
    color: var(--text);
    font-size: 0.95rem;
}

.detail__list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 8px;
    height: 8px;
    background: var(--secondary);
    border-radius: 50%;
}

/* Mockups */
.detail__mockup {
    background: linear-gradient(135deg, #EFF6FF, #DBEAFE);
    border-radius: var(--radius-lg);
    padding: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 320px;
}

.mockup__chart {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    height: 200px;
}

.mockup__bar {
    width: 36px;
    background: var(--primary);
    border-radius: 6px 6px 0 0;
    opacity: 0.6;
    transition: var(--transition);
}

.mockup__bar--highlight {
    opacity: 1;
    background: var(--primary);
}

.detail__mockup--risk {
    background: linear-gradient(135deg, #FEF3C7, #FDE68A);
}

.mockup__gauge {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: conic-gradient(var(--secondary) 0deg 108deg, #E5E7EB 108deg 360deg);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.mockup__gauge-fill {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: #FEF3C7;
}

.mockup__gauge-text {
    position: absolute;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary);
}

.detail__mockup--refund {
    background: linear-gradient(135deg, #ECFDF5, #D1FAE5);
}

.mockup__refund {
    text-align: center;
}

.mockup__refund-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 8px;
}

.mockup__refund-amount {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 24px;
}

.mockup__refund-btn {
    display: inline-block;
    padding: 14px 32px;
    background: var(--secondary);
    color: #fff;
    border-radius: 8px;
    font-weight: 600;
}

/* ===== Security Section ===== */
.security {
    padding: 120px 0;
    background: var(--bg-dark);
}

.security__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-bottom: 80px;
}

.security__card {
    padding: 36px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    text-align: center;
}

.security__icon {
    margin-bottom: 20px;
}

.security__card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
}

.security__card p {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.6;
}

.security__stats {
    display: flex;
    justify-content: center;
    gap: 80px;
}

.security__stat {
    text-align: center;
}

.security__stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--secondary);
}

.security__stat-suffix {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary);
}

.security__stat-label {
    display: block;
    margin-top: 8px;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

/* ===== Download Section ===== */
.download {
    padding: 120px 0;
    background: linear-gradient(135deg, #2563EB, #1E40AF);
    text-align: center;
}

.download .section__title {
    color: #fff;
}

.download .section__subtitle {
    color: rgba(255, 255, 255, 0.8);
}

.download__buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.download__badge {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 28px;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    color: #fff;
    transition: var(--transition);
}

.download__badge:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.download__badge small {
    display: block;
    font-size: 0.75rem;
    opacity: 0.8;
}

.download__badge span {
    font-size: 1.1rem;
    font-weight: 600;
}

.download__pc {
    display: inline-block;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
    transition: var(--transition);
}

.download__pc:hover {
    color: #fff;
}

/* ===== Footer ===== */
.footer {
    padding: 80px 0 40px;
    background: #0F172A;
    color: rgba(255, 255, 255, 0.7);
}

.footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer__logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
    display: block;
    margin-bottom: 12px;
}

.footer__company {
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 8px;
}

.footer__info {
    font-size: 0.85rem;
    margin-bottom: 4px;
}

.footer__links h4 {
    color: #fff;
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer__links li {
    margin-bottom: 10px;
}

.footer__links a {
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    text-align: center;
    font-size: 0.85rem;
}

/* ===== Animations ===== */
.animate-fade-up,
.animate-slide-left,
.animate-slide-right {
    opacity: 0;
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-fade-up {
    transform: translateY(30px);
}

.animate-slide-left {
    transform: translateX(50px);
}

.animate-slide-right {
    transform: translateX(-50px);
}

.animate-fade-up.is-visible,
.animate-slide-left.is-visible,
.animate-slide-right.is-visible {
    opacity: 1;
    transform: translate(0);
}

.animate-delay-1 { transition-delay: 0.15s; }
.animate-delay-2 { transition-delay: 0.3s; }
.animate-delay-3 { transition-delay: 0.45s; }

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    .animate-fade-up,
    .animate-slide-left,
    .animate-slide-right {
        opacity: 1;
        transform: none;
        transition: none;
    }

    html {
        scroll-behavior: auto;
    }
}

/* ===== Responsive ===== */
@media (max-width: 1199px) {
    .value__grid,
    .features__grid,
    .security__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .detail__item {
        gap: 48px;
    }

    .footer__grid {
        grid-template-columns: 1fr 1fr;
        gap: 36px;
    }
}

@media (max-width: 767px) {
    .section__title {
        font-size: 1.85rem;
    }

    .section__subtitle {
        font-size: 1rem;
        margin-bottom: 40px;
    }

    /* Nav mobile */
    .nav__menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: #fff;
        flex-direction: column;
        padding: 80px 32px 32px;
        gap: 24px;
        box-shadow: var(--shadow-lg);
        transition: var(--transition);
    }

    .nav__menu.is-open {
        right: 0;
    }

    .nav__menu .nav__link {
        color: var(--text);
        font-size: 1.1rem;
    }

    .nav__cta {
        display: none;
    }

    .nav__hamburger {
        display: flex;
    }

    /* Hero mobile */
    .hero {
        padding: 100px 20px 60px;
    }

    .hero__title {
        font-size: 2.2rem;
    }

    .hero__subtitle {
        font-size: 1.1rem;
    }

    .hero__badges {
        flex-direction: column;
        gap: 12px;
        align-items: center;
    }

    /* Grids */
    .value__grid,
    .features__grid,
    .security__grid {
        grid-template-columns: 1fr;
    }

    .detail__item,
    .detail__item--reverse {
        grid-template-columns: 1fr;
        gap: 40px;
        direction: ltr;
    }

    .detail__item {
        margin-bottom: 80px;
    }

    .security__stats {
        flex-direction: column;
        gap: 32px;
    }

    .footer__grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 479px) {
    body {
        font-size: 15px;
    }

    .hero__title {
        font-size: 1.8rem;
    }

    .hero__cta {
        flex-direction: column;
        align-items: center;
    }

    .btn--lg {
        padding: 14px 32px;
        font-size: 1rem;
        width: 100%;
    }

    .download__buttons {
        flex-direction: column;
        align-items: center;
    }

    .download__badge {
        width: 100%;
        justify-content: center;
    }
}