/* ========================================
   영어학원 간판 - 메인 스타일시트
   클린 앤 심플 모던 디자인
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;600;700;800;900&family=Poppins:wght@300;400;500;600;700;800&display=swap');

:root {
    /* Color Scheme */
    --main-blue: #3563E9;
    --main-blue-dark: #2851C8;
    --main-blue-light: #5580EE;
    --white: #FFFFFF;
    --dark-navy: #192134;
    --dark-navy-light: #2D3A52;
    --gold: #FFC857;
    --gold-dark: #E5B34D;
    --light-gray: #F5F6FA;
    --medium-gray: #E8E9ED;
    --text-gray: #6B7280;
    --text-dark: #111827;
    --success: #10B981;
    --error: #EF4444;
    --warning: #F59E0B;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1), 0 4px 10px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.12), 0 8px 16px rgba(0,0,0,0.06);
    --shadow-blue: 0 10px 30px rgba(53, 99, 233, 0.3);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    --radius-full: 9999px;

    /* Spacing */
    --section-padding: 100px 0;
    --container-padding: 0 20px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--white);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========== UTILITIES ========== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--container-padding);
}

.container-wide {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--container-padding);
}

.section {
    padding: var(--section-padding);
}

.section-title {
    font-size: clamp(28px, 5vw, 42px);
    font-weight: 700;
    color: var(--dark-navy);
    text-align: center;
    margin-bottom: 20px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-gray);
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px;
}

.text-gradient {
    background: linear-gradient(135deg, var(--main-blue) 0%, var(--gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.highlight {
    color: var(--main-blue);
}

/* ========== BUTTONS ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    font-family: inherit;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--main-blue);
    color: var(--white);
    box-shadow: var(--shadow-blue);
}

.btn-primary:hover {
    background: var(--main-blue-dark);
    transform: translateY(-2px);
    box-shadow: 0 15px 35px rgba(53, 99, 233, 0.4);
}

.btn-secondary {
    background: var(--white);
    color: var(--dark-navy);
    border: 2px solid var(--medium-gray);
}

.btn-secondary:hover {
    border-color: var(--main-blue);
    color: var(--main-blue);
    transform: translateY(-2px);
}

.btn-gold {
    background: var(--gold);
    color: var(--dark-navy);
    box-shadow: 0 10px 30px rgba(255, 200, 87, 0.4);
}

.btn-gold:hover {
    background: var(--gold-dark);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 18px 42px;
    font-size: 18px;
}

.btn-sm {
    padding: 10px 20px;
    font-size: 14px;
}

.btn-icon {
    width: 48px;
    height: 48px;
    padding: 0;
    border-radius: 50%;
}

/* ========== HEADER ========== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: all var(--transition-normal);
}

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

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    font-weight: 800;
    font-size: 24px;
    color: var(--dark-navy);
}

.site-logo img {
    height: 45px;
    width: auto;
}

.site-logo span {
    background: linear-gradient(135deg, var(--main-blue), var(--dark-navy));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.main-nav a {
    padding: 10px 18px;
    font-size: 15px;
    font-weight: 500;
    color: var(--dark-navy);
    text-decoration: none;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.main-nav a:hover {
    background: var(--light-gray);
    color: var(--main-blue);
}

.main-nav a.active {
    background: var(--main-blue);
    color: var(--white);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mobile-menu-btn {
    display: none;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--dark-navy);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* ========== HERO SECTION ========== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 20px 80px;
    background: linear-gradient(180deg, var(--light-gray) 0%, var(--white) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(ellipse, rgba(53, 99, 233, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    width: 100%;
}

.hero-text {
    position: relative;
    z-index: 2;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(53, 99, 233, 0.1);
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 600;
    color: var(--main-blue);
    margin-bottom: 24px;
}

.hero-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--main-blue);
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
    font-size: clamp(36px, 6vw, 56px);
    font-weight: 800;
    line-height: 1.2;
    color: var(--dark-navy);
    margin-bottom: 24px;
}

.hero-description {
    font-size: 18px;
    color: var(--text-gray);
    margin-bottom: 36px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--medium-gray);
}

.hero-stat {
    text-align: left;
}

.hero-stat-value {
    font-size: 32px;
    font-weight: 800;
    color: var(--main-blue);
}

.hero-stat-label {
    font-size: 14px;
    color: var(--text-gray);
}

.hero-image {
    position: relative;
    z-index: 1;
}

.hero-image-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.hero-image img {
    width: 100%;
    height: auto;
    display: block;
}

.hero-image-decoration {
    position: absolute;
    width: 120%;
    height: 120%;
    top: -10%;
    left: -10%;
    background: linear-gradient(135deg, rgba(53, 99, 233, 0.2) 0%, rgba(255, 200, 87, 0.2) 100%);
    border-radius: var(--radius-lg);
    z-index: -1;
    transform: rotate(-3deg);
}

/* ========== FEATURES SECTION ========== */
.features {
    background: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    padding: 40px 30px;
    background: var(--white);
    border: 1px solid var(--medium-gray);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.feature-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 24px;
    background: linear-gradient(135deg, rgba(53, 99, 233, 0.1), rgba(255, 200, 87, 0.1));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark-navy);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 15px;
    color: var(--text-gray);
    line-height: 1.7;
}

/* ========== PORTFOLIO SECTION ========== */
.portfolio {
    background: var(--light-gray);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.portfolio-item {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 4/3;
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

.portfolio-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.portfolio-item:hover img {
    transform: scale(1.1);
}

.portfolio-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 30%, rgba(25, 33, 52, 0.9) 100%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 24px;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.portfolio-overlay h4 {
    font-size: 18px;
    color: var(--white);
    margin-bottom: 8px;
}

.portfolio-overlay p {
    font-size: 14px;
    color: rgba(255,255,255,0.8);
}

/* ========== QUOTE CALCULATOR ========== */
.quote-section {
    background: linear-gradient(135deg, var(--dark-navy) 0%, var(--dark-navy-light) 100%);
    color: var(--white);
}

.quote-section .section-title {
    color: var(--white);
}

.quote-section .section-subtitle {
    color: rgba(255,255,255,0.7);
}

.quote-calculator {
    max-width: 900px;
    margin: 0 auto;
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-xl);
}

.quote-form {
    display: grid;
    gap: 24px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 600;
    color: var(--dark-navy);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 14px 18px;
    font-size: 16px;
    font-family: inherit;
    border: 2px solid var(--medium-gray);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    background: var(--white);
    color: var(--text-dark);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--main-blue);
    box-shadow: 0 0 0 4px rgba(53, 99, 233, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.quote-result {
    margin-top: 32px;
    padding: 32px;
    background: var(--light-gray);
    border-radius: var(--radius-md);
    text-align: center;
    display: none;
}

.quote-result.show {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.quote-price {
    font-size: 48px;
    font-weight: 800;
    color: var(--main-blue);
    margin-bottom: 8px;
}

.quote-note {
    font-size: 14px;
    color: var(--text-gray);
}

/* ========== CTA SECTION ========== */
.cta-section {
    background: linear-gradient(135deg, var(--main-blue) 0%, var(--main-blue-dark) 100%);
    padding: 80px 20px;
    text-align: center;
}

.cta-content {
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    color: var(--white);
    margin-bottom: 20px;
}

.cta-text {
    font-size: 18px;
    color: rgba(255,255,255,0.9);
    margin-bottom: 32px;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========== TESTIMONIALS ========== */
.testimonials {
    background: var(--white);
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.testimonial-card {
    padding: 32px;
    background: var(--light-gray);
    border-radius: var(--radius-lg);
    position: relative;
}

.testimonial-card::before {
    content: '"';
    position: absolute;
    top: 20px;
    right: 24px;
    font-size: 80px;
    font-weight: 800;
    color: var(--main-blue);
    opacity: 0.1;
    line-height: 1;
}

.testimonial-content {
    font-size: 16px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 24px;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 16px;
}

.testimonial-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--main-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 700;
    font-size: 20px;
}

.testimonial-info h5 {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark-navy);
    margin-bottom: 4px;
}

.testimonial-info p {
    font-size: 14px;
    color: var(--text-gray);
}

/* ========== FOOTER ========== */
.site-footer {
    background: var(--dark-navy);
    color: var(--white);
    padding: 80px 20px 30px;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand h3 {
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 16px;
}

.footer-brand p {
    font-size: 15px;
    color: rgba(255,255,255,0.7);
    line-height: 1.8;
    margin-bottom: 24px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    width: 44px;
    height: 44px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background: var(--main-blue);
    transform: translateY(-3px);
}

.footer-column h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--white);
}

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

.footer-column li {
    margin-bottom: 12px;
}

.footer-column a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    font-size: 15px;
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--gold);
}

.footer-bottom {
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-copyright {
    font-size: 14px;
    color: rgba(255,255,255,0.5);
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    font-size: 14px;
    color: rgba(255,255,255,0.5);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* ========== FORMS (Auth Pages) ========== */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    background: linear-gradient(135deg, var(--light-gray) 0%, var(--white) 100%);
}

.auth-container {
    max-width: 440px;
    width: 100%;
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-xl);
}

.auth-header {
    text-align: center;
    margin-bottom: 36px;
}

.auth-header h1 {
    font-size: 28px;
    font-weight: 800;
    color: var(--dark-navy);
    margin-bottom: 8px;
}

.auth-header p {
    font-size: 15px;
    color: var(--text-gray);
}

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

.auth-form .btn {
    width: 100%;
    padding: 16px;
    margin-top: 8px;
}

.auth-links {
    margin-top: 24px;
    text-align: center;
    font-size: 14px;
    color: var(--text-gray);
}

.auth-links a {
    color: var(--main-blue);
    text-decoration: none;
    font-weight: 600;
}

.auth-links a:hover {
    text-decoration: underline;
}

.auth-divider {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 24px 0;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--medium-gray);
}

.auth-divider span {
    font-size: 13px;
    color: var(--text-gray);
}

/* ========== ALERTS ========== */
.alert {
    padding: 16px 20px;
    border-radius: var(--radius-md);
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

/* ========== PAGE HEADER ========== */
.page-header {
    padding: 140px 20px 80px;
    background: linear-gradient(135deg, var(--dark-navy) 0%, var(--dark-navy-light) 100%);
    text-align: center;
    color: var(--white);
}

.page-header h1 {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 800;
    margin-bottom: 16px;
}

.page-header p {
    font-size: 18px;
    color: rgba(255,255,255,0.8);
}

.breadcrumb {
    display: flex;
    justify-content: center;
    gap: 12px;
    font-size: 14px;
    margin-top: 20px;
}

.breadcrumb a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
}

.breadcrumb a:hover {
    color: var(--gold);
}

.breadcrumb span {
    color: rgba(255,255,255,0.5);
}

/* ========== MOBILE MENU ========== */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    max-width: 320px;
    height: 100vh;
    background: var(--white);
    z-index: 1001;
    padding: 80px 24px 40px;
    transition: right var(--transition-normal);
    box-shadow: -10px 0 40px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    background: var(--light-gray);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--dark-navy);
}

.mobile-menu-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
}

.mobile-menu-nav a {
    padding: 14px 0;
    font-size: 17px;
    font-weight: 500;
    color: var(--dark-navy);
    text-decoration: none;
    border-bottom: 1px solid var(--medium-gray);
}

.mobile-menu-nav a:hover {
    color: var(--main-blue);
}

.mobile-menu-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding-top: 24px;
}

.mobile-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.mobile-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text {
        order: 2;
    }

    .hero-image {
        order: 1;
        max-width: 500px;
        margin: 0 auto;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-actions {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px 0;
    }

    .main-nav {
        display: none;
    }

    .header-actions .btn {
        display: none;
    }

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

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

    .footer-social {
        justify-content: center;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .quote-calculator {
        padding: 32px 24px;
    }

    .auth-container {
        padding: 32px 24px;
    }
}

@media (max-width: 480px) {
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }

    .hero-stat {
        text-align: center;
    }

    .hero-actions {
        flex-direction: column;
    }

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

    .cta-buttons {
        flex-direction: column;
    }

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