/**
 * styles.css - 디자인 시스템
 * 중고가전 태인 (3.중고가전매입판매사이트)
 * 컬러: Teal + Amber + Indigo
 */

/* ================================
   CSS Variables
   ================================ */
:root {
    /* Colors - Primary (Teal) */
    --color-primary: #0D9488;
    --color-primary-dark: #0F766E;
    --color-primary-light: #14B8A6;
    --color-primary-lighter: #99F6E4;
    --color-primary-bg: #F0FDFA;

    /* Colors - Secondary (Amber) */
    --color-secondary: #F59E0B;
    --color-secondary-dark: #D97706;
    --color-secondary-light: #FBBF24;
    --color-secondary-bg: #FFFBEB;

    /* Colors - Accent (Indigo) */
    --color-accent: #6366F1;
    --color-accent-dark: #4F46E5;
    --color-accent-light: #818CF8;
    --color-accent-bg: #EEF2FF;

    /* Colors - Background */
    --color-bg: #FAFBFC;
    --color-bg-alt: #F0FDFA;
    --color-bg-dark: #E6FFFA;
    --color-bg-white: #FFFFFF;

    /* Colors - Text */
    --color-text: #1E293B;
    --color-text-light: #64748B;
    --color-text-lighter: #94A3B8;
    --color-text-white: #FFFFFF;

    /* Colors - CTA */
    --color-cta: #F59E0B;
    --color-cta-hover: #D97706;
    --color-cta-text: #FFFFFF;

    /* Colors - Utility */
    --color-border: #E2E8F0;
    --color-border-light: #F1F5F9;
    --color-success: #10B981;
    --color-danger: #EF4444;
    --color-warning: #F59E0B;
    --color-info: #3B82F6;

    /* Typography */
    --font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    --line-height-tight: 1.25;
    --line-height-normal: 1.6;
    --line-height-relaxed: 1.8;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 5rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
    --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.10);
    --shadow-lg: 0 8px 24px rgba(15, 23, 42, 0.14);
    --shadow-xl: 0 16px 48px rgba(15, 23, 42, 0.18);

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

    /* Layout */
    --container-max: 1200px;
    --header-height: 120px;
    --utility-bar-height: 40px;
    --main-nav-height: 80px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

body.menu-open {
    overflow: hidden;
}

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

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

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

ul, ol {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-text);
}

strong {
    color: var(--color-primary);
}

/* ================================
   Layout
   ================================ */
.page-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
    padding-top: var(--header-height);
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-3xl) 0;
}

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

.section--dark {
    background-color: var(--color-text);
    color: var(--color-text-white);
}

.section--dark strong {
    color: var(--color-secondary-light);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-extrabold);
    margin-bottom: var(--spacing-xs);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* ================================
   Utility Bar (상단 정보 바)
   ================================ */
.utility-bar {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    color: var(--color-text-white);
    height: var(--utility-bar-height);
    display: flex;
    align-items: center;
    font-size: var(--font-size-sm);
    position: relative;
    z-index: 1001;
}

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

.utility-bar__left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.utility-bar__item {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--color-text-white);
    opacity: 0.9;
}

.utility-bar__item a {
    color: var(--color-text-white);
    font-weight: var(--font-weight-semibold);
}

.utility-bar__item a:hover {
    color: var(--color-secondary-light);
}

.utility-bar__divider {
    width: 1px;
    height: 14px;
    background: rgba(255, 255, 255, 0.3);
}

.utility-bar__right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    opacity: 0.85;
}

/* ================================
   Header (메인 네비게이션)
   ================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--color-bg-white);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.header--scrolled .utility-bar {
    display: none;
}

.header--scrolled + main,
.header--scrolled ~ main {
    padding-top: var(--main-nav-height);
}

.header--hidden {
    transform: translateY(-100%);
}

.header__main {
    height: var(--main-nav-height);
    display: flex;
    align-items: center;
    background: var(--color-bg-white);
    border-bottom: 1px solid var(--color-border-light);
}

.header__main .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

/* 로고 */
.header__logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    flex-shrink: 0;
}

.logo-icon {
    font-size: 1.75rem;
    line-height: 1;
}

.logo-icon-img {
    border-radius: 6px;
    flex-shrink: 0;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-main {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-extrabold);
    color: var(--color-primary);
    line-height: 1.2;
}

.logo-sub {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
    font-weight: var(--font-weight-medium);
}

/* 네비게이션 */
.header__nav {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 0;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: block;
    padding: 0.75rem 1rem;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    transition: color var(--transition-fast);
    white-space: nowrap;
}

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

.nav-link.active {
    background: var(--color-primary);
    color: var(--color-text-white);
    border-radius: var(--radius-sm);
    font-weight: var(--font-weight-bold);
}

/* 서브 메뉴 */
.nav-sub {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    background: var(--color-bg-white);
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
    z-index: 100;
    padding: 0.5rem 0;
    border: 1px solid var(--color-border-light);
}

.nav-item--has-sub:hover .nav-sub {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-sub--wide {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    min-width: 300px;
    gap: 0;
}

.nav-sub li a {
    display: block;
    padding: 0.5rem 1.25rem;
    font-size: var(--font-size-sm);
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.nav-sub li a:hover,
.nav-sub li a.active {
    background: var(--color-primary);
    color: var(--color-text-white);
}

.nav-sub__divider {
    height: 1px;
    background: var(--color-border-light);
    margin: 0.35rem 0;
}

/* 헤더 CTA */
.header__cta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.header__phone {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    background: var(--color-cta);
    color: var(--color-cta-text);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
    transition: background var(--transition-fast);
    text-decoration: none;
}

.header__phone:hover {
    background: var(--color-cta-hover);
    color: var(--color-cta-text);
}

.phone-icon {
    font-size: 1rem;
}

/* 모바일 메뉴 토글 */
.header__mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    margin-left: auto;
    cursor: pointer;
    padding: 8px;
    z-index: 1002;
}

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

.header__mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.header__mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}

.header__mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ================================
   Breadcrumb
   ================================ */
.breadcrumb {
    background: var(--color-bg-alt);
    padding: 0.75rem 0;
    font-size: var(--font-size-sm);
    border-bottom: 1px solid var(--color-border-light);
}

.breadcrumb .container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--color-text-light);
}

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

.breadcrumb span {
    color: var(--color-text-lighter);
}

.breadcrumb span:last-child {
    color: var(--color-text);
    font-weight: var(--font-weight-medium);
}

/* ================================
   Buttons
   ================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.5rem;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    line-height: 1.4;
    white-space: nowrap;
    font-family: var(--font-family);
}

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

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

.btn--secondary {
    background: var(--color-secondary);
    color: var(--color-text-white);
    border-color: var(--color-secondary);
}

.btn--secondary:hover {
    background: var(--color-secondary-dark);
    border-color: var(--color-secondary-dark);
    color: var(--color-text-white);
}

.btn--accent {
    background: var(--color-accent);
    color: var(--color-text-white);
    border-color: var(--color-accent);
}

.btn--accent:hover {
    background: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
    color: var(--color-text-white);
}

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

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

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

.btn--outline-secondary:hover {
    background: var(--color-secondary);
    color: var(--color-text-white);
}

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

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

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

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

.btn--large {
    padding: 0.875rem 2rem;
    font-size: var(--font-size-base);
}

.btn--small {
    padding: 0.375rem 1rem;
    font-size: var(--font-size-xs);
}

.btn--full {
    width: 100%;
}

/* ================================
   Forms
   ================================ */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: 0.375rem;
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    color: var(--color-text);
}

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

input[type="text"],
input[type="tel"],
input[type="email"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg-white);
    color: var(--color-text);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
}

input.error,
select.error,
textarea.error {
    border-color: var(--color-danger);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: var(--font-size-sm);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    margin: 0;
    cursor: pointer;
}

.checkbox-label a {
    font-weight: var(--font-weight-semibold);
    text-decoration: underline;
}

/* ================================
   Footer - 3행 구조
   ================================ */
.footer {
    margin-top: auto;
}

/* 1행: 밝은 배경 3열 */
.footer__main {
    background: var(--color-bg-alt);
    padding: var(--spacing-2xl) 0;
    border-top: 1px solid var(--color-border);
}

.footer__content {
    display: grid;
    grid-template-columns: 1.2fr 1fr 1fr;
    gap: var(--spacing-2xl);
}

.footer__company {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer__logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.25rem;
}

.footer__logo .logo-main {
    font-size: var(--font-size-lg);
}

.footer__slogan {
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
    font-style: italic;
}

.footer__contact {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.footer__phone {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

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

.footer__hours {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.footer__links h4 {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer__links ul li {
    margin-bottom: 0.5rem;
}

.footer__links ul li a {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    transition: color var(--transition-fast);
}

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

/* 2행: 지역 링크 바 */
.footer__areas {
    background: var(--color-primary-bg);
    padding: var(--spacing-sm) 0;
    border-top: 1px solid var(--color-border-light);
    border-bottom: 1px solid var(--color-border-light);
}

.footer__areas .container {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.25rem;
}

.footer__areas-label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-right: 0.5rem;
}

.footer__areas a {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    padding: 0.25rem 0.5rem;
    transition: color var(--transition-fast);
}

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

.footer__areas-divider {
    color: var(--color-border);
    font-size: var(--font-size-xs);
}

/* 3행: 다크 바 */
.footer__bottom {
    background: var(--color-text);
    color: var(--color-text-white);
    padding: var(--spacing-sm) 0;
}

.footer__bottom .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.footer__legal {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.footer__legal a {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
}

.footer__legal a:hover {
    color: var(--color-text-white);
}

.footer__legal span {
    color: rgba(255, 255, 255, 0.3);
    font-size: var(--font-size-xs);
}

.footer__copyright {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
}

.footer__business {
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.4);
    width: 100%;
    text-align: center;
    margin-top: 0.25rem;
}

/* ================================
   Floating CTA
   ================================ */
.floating-cta {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 999;
}

.floating-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    border: none;
    cursor: pointer;
    font-family: var(--font-family);
}

.floating-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

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

.floating-btn--phone:hover {
    background: var(--color-primary-dark);
    color: var(--color-text-white);
}

.floating-btn--quote {
    background: var(--color-secondary);
    color: var(--color-text-white);
}

.floating-btn--quote:hover {
    background: var(--color-secondary-dark);
    color: var(--color-text-white);
}

.floating-btn--top {
    background: var(--color-bg-white);
    color: var(--color-text);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
}

.floating-btn--top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.floating-btn--top:hover {
    background: var(--color-primary-bg);
    color: var(--color-primary);
}

.floating-btn__icon {
    font-size: 1.125rem;
    line-height: 1;
}

.floating-btn__text {
    line-height: 1;
}

/* 모바일 하단 CTA 바 */
.mobile-cta-bar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 999;
    background: var(--color-bg-white);
    border-top: 1px solid var(--color-border);
    box-shadow: 0 -2px 8px rgba(15, 23, 42, 0.1);
}

.mobile-cta-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.2rem;
    padding: 0.75rem 0;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    text-decoration: none;
    flex: 1;
    transition: all var(--transition-fast);
}

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

.mobile-cta-btn--secondary {
    background: var(--color-secondary);
    color: var(--color-text-white);
}

.mobile-cta-btn__icon {
    font-size: 1.25rem;
}

/* ================================
   Utilities
   ================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-accent { color: var(--color-accent); }
.text-light { color: var(--color-text-light); }
.text-white { color: var(--color-text-white); }
.text-bold { font-weight: var(--font-weight-bold); }
.bg-primary { background-color: var(--color-primary); }
.bg-alt { background-color: var(--color-bg-alt); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }