/* ===== 기본 설정 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #818cf8;
    --secondary-color: #f59e0b;
    --accent-color: #10b981;
    --text-dark: #1f2937;
    --text-gray: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all 0.3s ease;
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

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

.nav-link:hover::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    transition: all 0.3s ease;
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-hero {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    padding: 16px 40px;
    font-size: 1.1rem;
    box-shadow: var(--shadow-lg);
}

.btn-hero:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.btn-large {
    padding: 18px 50px;
    font-size: 1.2rem;
    background: var(--secondary-color);
    color: white;
}

.btn-large:hover {
    background: #d97706;
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 150px 0 100px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.3) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.hero-content {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text {
    animation: fadeInUp 0.8s ease;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-title .emoji {
    display: inline-block;
    animation: wave 2s ease-in-out infinite;
}

@keyframes wave {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(20deg); }
    75% { transform: rotate(-20deg); }
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 15px;
    font-weight: 600;
}

.hero-description {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.95;
}

.hero-illustration {
    animation: fadeInRight 0.8s ease;
}

.illustration-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    border: 2px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-xl);
}

.qr-mockup {
    background: white;
    border-radius: 15px;
    padding: 30px;
    color: var(--text-dark);
}

.qr-code {
    width: 200px;
    height: 200px;
    background:
        linear-gradient(to right, var(--primary-color) 2px, transparent 2px) 0 0,
        linear-gradient(to right, var(--primary-color) 2px, transparent 2px) 0 100%,
        linear-gradient(to bottom, var(--primary-color) 2px, transparent 2px) 0 0,
        linear-gradient(to bottom, var(--primary-color) 2px, transparent 2px) 100% 0;
    background-repeat: repeat-x, repeat-x, repeat-y, repeat-y;
    background-size: 20px 20px;
    margin: 0 auto 20px;
    border: 3px solid var(--primary-color);
    border-radius: 10px;
}

.hero-wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    overflow: hidden;
    line-height: 0;
}

.hero-wave svg {
    display: block;
    width: calc(100% + 1.3px);
    height: 60px;
}

@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);
    }
}

/* ===== Sections ===== */
.section {
    padding: 80px 0;
}

.section-gray {
    background: var(--bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 15px;
}

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

/* ===== Service Introduction ===== */
.intro-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 40px;
    align-items: start;
}

.feature-list {
    list-style: none;
    font-size: 1.1rem;
}

.feature-list li {
    padding: 15px 0;
    padding-left: 30px;
    position: relative;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
    font-size: 1.3rem;
}

.highlight-box {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow-md);
    border-left: 5px solid var(--secondary-color);
}

.highlight-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.highlight-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-dark);
}

/* ===== Usage Method ===== */
.usage-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.usage-card {
    background: white;
    border-radius: 15px;
    padding: 40px;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.usage-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.usage-subtitle {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 30px;
    text-align: center;
}

.steps {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.step {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.step-number {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
}

.step-content h4 {
    font-size: 1.1rem;
    color: var(--text-dark);
    line-height: 1.5;
}

/* ===== QR Sample ===== */
.sample-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 30px;
}

.sample-card {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.sample-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.sample-mockup {
    border: 2px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    background: var(--bg-light);
}

.mockup-header {
    background: var(--primary-color);
    color: white;
    padding: 15px;
    text-align: center;
}

.store-name {
    font-size: 1.2rem;
    font-weight: 600;
}

.mockup-qr {
    padding: 30px;
    background: white;
    display: flex;
    justify-content: center;
}

.qr-placeholder {
    width: 150px;
    height: 150px;
    background:
        linear-gradient(to right, var(--primary-color) 2px, transparent 2px) 0 0,
        linear-gradient(to right, var(--primary-color) 2px, transparent 2px) 0 100%,
        linear-gradient(to bottom, var(--primary-color) 2px, transparent 2px) 0 0,
        linear-gradient(to bottom, var(--primary-color) 2px, transparent 2px) 100% 0;
    background-repeat: repeat-x, repeat-x, repeat-y, repeat-y;
    background-size: 15px 15px;
    border: 3px solid var(--primary-color);
    border-radius: 8px;
}

.mockup-info {
    padding: 20px;
    background: white;
}

.account-holder {
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-gray);
}

.account-number {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-light);
    padding: 12px 15px;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    font-weight: 600;
}

.copy-btn {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 6px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.copy-btn:hover {
    background: #059669;
    transform: scale(1.05);
}

.mockup-banks {
    padding: 15px 20px;
    text-align: center;
    background: var(--bg-light);
}

.mockup-banks p {
    font-size: 0.9rem;
    color: var(--text-gray);
    margin-bottom: 10px;
}

.bank-icons {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.bank-icon {
    font-size: 1.5rem;
    opacity: 0.7;
    transition: opacity 0.3s ease;
    cursor: pointer;
}

.bank-icon:hover {
    opacity: 1;
}

.sample-note {
    text-align: center;
    padding: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

.sample-note p {
    color: var(--text-gray);
    font-size: 1rem;
}

/* ===== Application Guide ===== */
.section-apply {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.apply-steps {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.apply-step {
    flex: 1;
    min-width: 200px;
    max-width: 280px;
    background: white;
    border-radius: 15px;
    padding: 35px 25px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease;
}

.apply-step:hover {
    transform: translateY(-5px);
}

.apply-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0 auto 20px;
}

.apply-step h3 {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.apply-step p {
    color: var(--text-gray);
    line-height: 1.6;
}

.apply-arrow {
    font-size: 2rem;
    color: var(--primary-color);
    font-weight: 700;
}

.apply-cta {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.btn-email {
    background: var(--secondary-color);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-email:hover {
    background: #d97706;
}

.btn-form {
    background: var(--accent-color);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-form:hover {
    background: #059669;
}

.apply-note {
    margin-top: 10px;
    color: var(--text-gray);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ===== FAQ ===== */
.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border-radius: 12px;
    margin-bottom: 15px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: box-shadow 0.3s ease;
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
}

.faq-question {
    padding: 25px 30px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.faq-question h3 {
    font-size: 1.1rem;
    color: var(--text-dark);
    font-weight: 600;
}

.faq-toggle {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 300;
    transition: transform 0.3s ease;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 200px;
    padding: 0 30px 25px;
}

.faq-answer p {
    color: var(--text-gray);
    line-height: 1.8;
    font-size: 1rem;
}

/* ===== Contact ===== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.contact-card {
    background: white;
    border-radius: 15px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease;
}

.contact-card:hover {
    transform: translateY(-5px);
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.contact-card h3 {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.contact-card p {
    color: var(--text-gray);
    font-size: 1rem;
}

.contact-card a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.contact-card a:hover {
    color: var(--primary-dark);
}

/* ===== Footer ===== */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 40px 0 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.footer-text {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
}

.footer-links {
    display: flex;
    gap: 15px;
    align-items: center;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: white;
}

.footer-links span {
    color: rgba(255, 255, 255, 0.3);
}

.footer-bottom {
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

/* ===== Scroll to Top Button ===== */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

/* ===== Responsive Design ===== */
@media (max-width: 968px) {
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        gap: 15px;
    }

    .nav.active {
        display: flex;
    }

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

    .header-content .btn-primary {
        display: none;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .hero-subtitle {
        font-size: 1.3rem;
    }

    .hero-description {
        font-size: 1.1rem;
    }

    .intro-content {
        grid-template-columns: 1fr;
    }

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

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

    .apply-steps {
        flex-direction: column;
        align-items: stretch;
    }

    .apply-arrow {
        transform: rotate(90deg);
    }

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

    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

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

    .section {
        padding: 60px 0;
    }
}

@media (max-width: 600px) {
    .hero {
        padding: 120px 0 80px;
    }

    .hero-title {
        font-size: 1.8rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .section-title {
        font-size: 1.7rem;
    }

    .btn {
        padding: 10px 25px;
        font-size: 0.95rem;
    }

    .btn-hero {
        padding: 14px 35px;
        font-size: 1rem;
    }

    .btn-large {
        padding: 15px 40px;
        font-size: 1.1rem;
    }

    .scroll-top {
        width: 45px;
        height: 45px;
        bottom: 20px;
        right: 20px;
    }
}

/* ===== Animations ===== */
.fade-in {
    animation: fadeIn 0.6s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.slide-up {
    animation: slideUp 0.6s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}