/* ============================================
   CHLEE Company Site - Main Stylesheet
   Tech: JSP + Spring Boot + MariaDB
   ============================================ */

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

:root {
    /* Brand Colors */
    --color-primary: #1a56db;
    --color-primary-dark: #1442a8;
    --color-primary-light: #e8effc;
    --color-accent: #0ea5e9;

    /* Neutrals */
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-border: #e2e8f0;

    /* Feedback */
    --color-success: #16a34a;
    --color-success-bg: #f0fdf4;
    --color-error: #dc2626;
    --color-error-bg: #fef2f2;

    /* Sizing */
    --max-width: 1140px;
    --header-height: 72px;
    --radius: 8px;
    --radius-lg: 12px;

    /* Shadow */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);

    /* Transition */
    --transition: 0.25s ease;
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont,
        'Malgun Gothic', '맑은 고딕', sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition);
}

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

/* ============================================
   Layout
   ============================================ */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

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

/* ============================================
   Header / Navigation
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    display: flex;
    align-items: center;
}

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

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

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -0.5px;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 8px;
    align-items: center;
}

.nav-link {
    display: block;
    padding: 8px 16px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    border-radius: var(--radius);
    transition: all var(--transition);
}

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

.nav-link--cta {
    color: #fff;
    background: var(--color-primary);
    padding: 8px 20px;
}

.nav-link--cta:hover {
    background: var(--color-primary-dark);
    color: #fff;
}

/* Mobile Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition);
}

/* ============================================
   Main content offset
   ============================================ */
.main {
    padding-top: var(--header-height);
}

/* ============================================
   Hero
   ============================================ */
.hero {
    padding: 100px 0 80px;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-bg) 100%);
}

.hero-content {
    max-width: 680px;
}

.hero-title {
    font-size: 2.75rem;
    font-weight: 800;
    line-height: 1.3;
    color: var(--color-text);
    letter-spacing: -1px;
}

.text-accent {
    color: var(--color-primary);
}

.hero-subtitle {
    margin-top: 20px;
    font-size: 1.15rem;
    color: var(--color-text-light);
    line-height: 1.8;
}

.hero-actions {
    margin-top: 36px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    border: 2px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
}

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

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

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

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

.btn-lg {
    padding: 16px 36px;
    font-size: 1.05rem;
}

.btn-block {
    width: 100%;
}

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

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

.section--alt {
    background: var(--color-bg-alt);
}

.section--cta {
    background: linear-gradient(135deg, #1e3a5f 0%, var(--color-primary) 100%);
    color: #fff;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 8px;
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-light);
    margin-bottom: 48px;
    font-size: 1.05rem;
}

/* ============================================
   Page Header (서브페이지 상단)
   ============================================ */
.page-header {
    padding: 60px 0 40px;
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
}

.page-header-title {
    font-size: 2.25rem;
    font-weight: 800;
}

.page-header-sub {
    margin-top: 8px;
    color: var(--color-text-light);
    font-size: 1.05rem;
}

/* ============================================
   Cards
   ============================================ */
.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

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

.card-grid--4col {
    grid-template-columns: repeat(4, 1fr);
}

.card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    transition: all var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.card-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
}

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

.card-link {
    display: inline-block;
    margin-top: 16px;
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.9rem;
}

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

/* ============================================
   Value Items (핵심 가치)
   ============================================ */
.value-item {
    text-align: center;
    padding: 24px 16px;
}

.value-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.value-item h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.value-item p {
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* ============================================
   About
   ============================================ */
.about-text {
    max-width: 800px;
}

.about-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 20px;
}

.about-text p {
    margin-bottom: 16px;
    font-size: 1.05rem;
    color: var(--color-text-light);
}

/* ============================================
   Business Section
   ============================================ */
.business-block {
    max-width: 900px;
    margin: 0 auto;
}

.business-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.business-num {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-primary);
    opacity: 0.3;
    line-height: 1;
}

.business-title {
    font-size: 1.75rem;
    font-weight: 700;
}

.business-lead {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: 28px;
    line-height: 1.8;
}

.business-detail-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 24px;
}

.business-detail {
    padding: 20px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.business-detail h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-primary);
}

.business-detail p {
    color: var(--color-text-light);
    font-size: 0.9rem;
    line-height: 1.7;
}

.tech-stack-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tech-badge {
    display: inline-block;
    padding: 4px 12px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-light);
    border-radius: 20px;
}

/* ============================================
   CTA
   ============================================ */
.cta-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.cta-desc {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 32px;
}

.section--cta .btn-primary {
    background: #fff;
    color: var(--color-primary);
    font-weight: 700;
}

.section--cta .btn-primary:hover {
    background: var(--color-primary-light);
}

/* ============================================
   Form (문의하기)
   ============================================ */
.form-wrapper {
    max-width: 720px;
    margin: 0 auto;
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
}

.required {
    color: var(--color-error);
}

.form-control {
    width: 100%;
    padding: 12px 14px;
    font-size: 0.95rem;
    font-family: inherit;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg);
    color: var(--color-text);
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}

.form-control:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.15);
}

.form-control::placeholder {
    color: #a0aec0;
}

textarea.form-control {
    resize: vertical;
    min-height: 160px;
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}

.form-error {
    font-size: 0.82rem;
    color: var(--color-error);
}

.form-hint {
    font-size: 0.82rem;
    color: var(--color-text-light);
    text-align: right;
}

.form-actions {
    margin-top: 8px;
}

/* Checkbox */
.form-group--checkbox {
    gap: 8px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    cursor: pointer;
    font-size: 0.9rem;
}

.checkbox-label input[type="checkbox"] {
    margin-top: 3px;
    accent-color: var(--color-primary);
}

.link-btn {
    background: none;
    border: none;
    color: var(--color-primary);
    font-size: 0.85rem;
    cursor: pointer;
    text-decoration: underline;
    padding: 0;
}

.privacy-detail {
    padding: 14px 16px;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.85rem;
    color: var(--color-text-light);
}

.privacy-detail p {
    margin-bottom: 4px;
}

/* ============================================
   Alerts
   ============================================ */
.alert {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    margin-bottom: 20px;
}

.alert--success {
    background: var(--color-success-bg);
    color: var(--color-success);
    border: 1px solid #bbf7d0;
}

.alert--error {
    background: var(--color-error-bg);
    color: var(--color-error);
    border: 1px solid #fecaca;
}

.alert-icon {
    font-size: 1.2rem;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: #111827;
    color: #d1d5db;
    padding: 48px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
}

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

.footer-desc {
    font-size: 0.9rem;
    line-height: 1.7;
    color: #9ca3af;
}

.footer-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 14px;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-links li,
.footer-links a {
    font-size: 0.9rem;
    color: #9ca3af;
}

.footer-links a:hover {
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid #1f2937;
    padding: 20px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.82rem;
    color: #6b7280;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    .card-grid--4col {
        grid-template-columns: repeat(2, 1fr);
    }
    .business-detail-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }

    .card-grid,
    .card-grid--2col {
        grid-template-columns: 1fr;
    }

    .card-grid--4col {
        grid-template-columns: repeat(2, 1fr);
    }

    .business-detail-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    /* Mobile Nav */
    .nav-toggle {
        display: flex;
    }

    .nav-list {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: 16px 24px;
        gap: 4px;
        box-shadow: var(--shadow-md);
    }

    .nav-list.active {
        display: flex;
    }

    .nav-link {
        padding: 12px 16px;
        width: 100%;
    }

    .nav-link--cta {
        text-align: center;
        margin-top: 8px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 60px 0 50px;
    }

    .hero-title {
        font-size: 1.6rem;
    }

    .section {
        padding: 50px 0;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .card-grid--4col {
        grid-template-columns: 1fr;
    }
}