/**
 * responsive.css - 영어회화 단어장 반응형 스타일
 * 위치: /assets/css/responsive.css
 * Mobile-first responsive design
 */

/* ========== Tablet (768px ~ 1024px) ========== */
@media screen and (max-width: 1024px) {
    :root {
        --header-height: 70px;
    }

    .container {
        padding: 0 20px;
    }

    /* 헤더 */
    .nav-list {
        gap: 4px;
    }

    .nav-item > a {
        padding: 10px 14px;
        font-size: 14px;
    }

    .nav-auth {
        gap: 8px;
    }

    .btn-auth {
        padding: 8px 16px;
        font-size: 13px;
    }

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

    .section-header {
        margin-bottom: 48px;
    }

    .section-title {
        font-size: clamp(28px, 4vw, 40px);
    }

    .section-desc {
        font-size: 16px;
    }

    /* 푸터 */
    .footer-top {
        grid-template-columns: 1fr;
        gap: 48px;
        padding: 60px 0 48px;
    }

    .footer-brand {
        max-width: 100%;
        text-align: center;
    }

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

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

    .footer-links {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
        text-align: center;
    }

    /* 게임 */
    .game-header {
        flex-direction: column;
        gap: 24px;
    }

    .game-info {
        width: 100%;
        justify-content: space-around;
    }

    .game-progress {
        max-width: 100%;
        width: 100%;
    }

    .game-card {
        padding: 48px 32px;
    }

    .game-options {
        grid-template-columns: 1fr;
    }
}

/* ========== Mobile Large (481px ~ 767px) ========== */
@media screen and (max-width: 767px) {
    :root {
        --header-height: 64px;
    }

    /* 헤더 - 모바일 네비게이션 */
    .mobile-menu-btn {
        display: flex;
    }

    .main-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 85%;
        max-width: 320px;
        height: 100vh;
        background: var(--bg-medium);
        flex-direction: column;
        align-items: flex-start;
        justify-content: flex-start;
        padding: calc(var(--header-height) + 20px) 24px 40px;
        gap: 20px;
        transition: right var(--transition-normal);
        border-left: 1px solid rgba(102, 126, 234, 0.2);
        overflow-y: auto;
        z-index: 1000;
    }

    .main-nav.active {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        width: 100%;
        gap: 0;
    }

    .nav-item {
        width: 100%;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    .nav-item > a {
        padding: 16px 0;
        font-size: 16px;
        width: 100%;
    }

    /* 드롭다운 - 모바일 */
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        background: transparent;
        border: none;
        box-shadow: none;
        padding: 0 0 0 16px;
        display: none;
    }

    .has-dropdown.open .dropdown-menu {
        display: block;
    }

    .dropdown-menu li a {
        padding: 12px 0;
        font-size: 14px;
    }

    .dropdown-menu li a:hover {
        padding-left: 8px;
    }

    .nav-auth {
        width: 100%;
        flex-direction: column;
        margin-top: 24px;
        padding-top: 24px;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

    .btn-auth {
        width: 100%;
        justify-content: center;
        padding: 14px 20px;
        font-size: 15px;
    }

    /* 로고 */
    .logo-text {
        font-size: 16px;
    }

    .logo-icon {
        width: 40px;
        height: 40px;
    }

    .logo-letter {
        font-size: 12px;
    }

    /* 섹션 */
    .section {
        padding: 60px 0;
    }

    .section-header {
        margin-bottom: 40px;
    }

    .section-badge {
        font-size: 12px;
        padding: 6px 14px;
    }

    .section-title {
        font-size: clamp(26px, 6vw, 32px);
        margin-bottom: 16px;
    }

    .section-desc {
        font-size: 15px;
    }

    /* 버튼 */
    .btn {
        padding: 14px 28px;
        font-size: 15px;
    }

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

    /* 카드 */
    .card {
        padding: 24px;
    }

    .card-icon {
        width: 56px;
        height: 56px;
        font-size: 24px;
        margin-bottom: 20px;
    }

    .card-title {
        font-size: 20px;
    }

    .card-desc {
        font-size: 14px;
    }

    /* 푸터 */
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .footer-col h4 {
        font-size: 15px;
        margin-bottom: 16px;
    }

    .footer-col ul li a {
        font-size: 13px;
    }

    .footer-bottom {
        padding: 24px 0;
    }

    .copyright {
        font-size: 13px;
    }

    .footer-info {
        font-size: 12px;
        line-height: 1.6;
    }

    /* 페이지 히어로 */
    .page-hero {
        padding: 60px 0;
    }

    .page-hero h1 {
        font-size: clamp(28px, 6vw, 40px);
    }

    .page-hero p {
        font-size: 16px;
    }

    /* 게임 */
    .game-container {
        padding: 24px 16px;
    }

    .game-header {
        padding: 20px;
    }

    .game-info {
        gap: 24px;
    }

    .game-stat-value {
        font-size: 24px;
    }

    .game-stat-label {
        font-size: 12px;
    }

    .game-card {
        padding: 40px 24px;
    }

    .game-word {
        font-size: clamp(24px, 6vw, 36px);
    }

    .game-hint {
        font-size: 14px;
    }

    .game-option {
        padding: 18px;
        font-size: 16px;
    }

    /* 랭킹 테이블 */
    .ranking-table th {
        padding: 12px 16px;
        font-size: 12px;
    }

    .ranking-table td {
        padding: 16px;
        font-size: 14px;
    }

    .rank-badge {
        width: 32px;
        height: 32px;
        font-size: 13px;
    }

    /* 슬라이더 */
    .slider-nav {
        width: 44px;
        height: 44px;
    }

    .slider-nav.prev {
        left: 12px;
    }

    .slider-nav.next {
        right: 12px;
    }

    .slider-nav svg {
        width: 20px;
        height: 20px;
    }

    .slider-dots {
        gap: 10px;
        margin-top: 20px;
    }

    .slider-dot {
        width: 10px;
        height: 10px;
    }

    /* 토스트 */
    .toast {
        bottom: 20px;
        right: 20px;
        left: 20px;
        padding: 14px 20px;
    }

    .toast-message {
        font-size: 14px;
    }
}

/* ========== Mobile Small (~ 480px) ========== */
@media screen and (max-width: 480px) {
    :root {
        --header-height: 60px;
    }

    .container {
        padding: 0 16px;
    }

    /* 헤더 */
    .logo-icon {
        width: 36px;
        height: 36px;
        border-radius: 10px;
    }

    .logo-letter {
        font-size: 11px;
    }

    .logo-text {
        font-size: 14px;
    }

    .mobile-menu-btn {
        width: 40px;
        height: 40px;
    }

    .mobile-menu-btn span {
        width: 22px;
    }

    /* 메인 네비 */
    .main-nav {
        width: 100%;
        max-width: 100%;
        padding: calc(var(--header-height) + 16px) 20px 32px;
    }

    .nav-item > a {
        padding: 14px 0;
        font-size: 15px;
    }

    /* 섹션 */
    .section {
        padding: 48px 0;
    }

    .section-header {
        margin-bottom: 32px;
    }

    .section-badge {
        font-size: 11px;
        padding: 5px 12px;
        margin-bottom: 16px;
    }

    .section-title {
        font-size: clamp(24px, 7vw, 28px);
    }

    .section-desc {
        font-size: 14px;
    }

    /* 버튼 */
    .btn {
        padding: 12px 24px;
        font-size: 14px;
        width: 100%;
    }

    .btn-lg {
        padding: 14px 28px;
        font-size: 15px;
    }

    /* 카드 */
    .card {
        padding: 20px;
        border-radius: var(--border-radius);
    }

    .card-icon {
        width: 48px;
        height: 48px;
        font-size: 22px;
        margin-bottom: 16px;
    }

    .card-title {
        font-size: 18px;
        margin-bottom: 10px;
    }

    .card-desc {
        font-size: 13px;
    }

    /* 푸터 */
    .footer-top {
        padding: 48px 0 40px;
    }

    .footer-brand {
        text-align: left;
    }

    .footer-logo {
        justify-content: flex-start;
    }

    .footer-social {
        justify-content: flex-start;
    }

    .footer-links {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
        text-align: left;
    }

    .footer-col h4 {
        font-size: 14px;
        margin-bottom: 12px;
    }

    .footer-col ul li {
        margin-bottom: 10px;
    }

    .footer-col ul li a {
        font-size: 12px;
    }

    .footer-bottom {
        padding: 20px 0;
    }

    .copyright {
        font-size: 12px;
    }

    .footer-info {
        font-size: 11px;
    }

    /* 페이지 히어로 */
    .page-hero {
        padding: 48px 0;
    }

    .page-hero h1 {
        font-size: clamp(24px, 7vw, 32px);
        margin-bottom: 16px;
    }

    .page-hero p {
        font-size: 14px;
    }

    /* 폼 */
    .form-group {
        margin-bottom: 20px;
    }

    .form-label {
        font-size: 13px;
        margin-bottom: 6px;
    }

    .form-input {
        padding: 14px 16px;
        font-size: 14px;
    }

    /* 게임 */
    .game-container {
        padding: 20px 12px;
    }

    .game-header {
        padding: 16px;
        margin-bottom: 24px;
    }

    .game-info {
        gap: 16px;
    }

    .game-stat-value {
        font-size: 20px;
    }

    .game-stat-label {
        font-size: 11px;
    }

    .game-card {
        padding: 32px 16px;
        margin-bottom: 24px;
    }

    .game-word {
        font-size: clamp(22px, 6vw, 28px);
        margin-bottom: 12px;
    }

    .game-hint {
        font-size: 13px;
    }

    .game-option {
        padding: 16px;
        font-size: 14px;
    }

    /* 랭킹 */
    .ranking-table th {
        padding: 10px 12px;
        font-size: 11px;
    }

    .ranking-table td {
        padding: 14px 12px;
        font-size: 13px;
    }

    .rank-badge {
        width: 28px;
        height: 28px;
        font-size: 12px;
        border-radius: 8px;
    }

    /* 슬라이더 */
    .slider-nav {
        width: 40px;
        height: 40px;
    }

    .slider-nav.prev {
        left: 8px;
    }

    .slider-nav.next {
        right: 8px;
    }

    .slider-nav svg {
        width: 18px;
        height: 18px;
    }

    .slider-dots {
        gap: 8px;
        margin-top: 16px;
    }

    .slider-dot {
        width: 8px;
        height: 8px;
    }

    /* 토스트 */
    .toast {
        bottom: 16px;
        right: 16px;
        left: 16px;
        padding: 12px 16px;
    }

    .toast-icon {
        font-size: 20px;
    }

    .toast-message {
        font-size: 13px;
    }

    /* 로딩 스피너 */
    .loading-spinner {
        width: 32px;
        height: 32px;
    }
}

/* ========== 가로 모드 (Landscape) ========== */
@media screen and (max-height: 500px) and (orientation: landscape) {
    .site-header {
        height: 56px;
    }

    .site-main {
        padding-top: 56px;
    }

    .page-hero {
        padding: 40px 0;
    }

    .section {
        padding: 40px 0;
    }

    .game-card {
        padding: 24px;
    }

    .game-word {
        font-size: 24px;
    }

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

/* ========== 고해상도 디스플레이 ========== */
@media screen and (min-width: 1600px) {
    :root {
        --container-max: 1600px;
    }

    html {
        font-size: 18px;
    }
}

/* ========== 저해상도 / 오래된 기기 ========== */
@media screen and (max-width: 320px) {
    html {
        font-size: 14px;
    }

    .container {
        padding: 0 12px;
    }

    .logo-text {
        font-size: 12px;
    }

    .section-title {
        font-size: 22px;
    }

    .btn {
        padding: 10px 20px;
        font-size: 13px;
    }
}

/* ========== 프린트 스타일 ========== */
@media print {
    .site-header,
    .site-footer,
    .mobile-menu-btn,
    .mobile-overlay,
    #particle-canvas,
    .slider-nav,
    .slider-dots {
        display: none !important;
    }

    body {
        background: white;
        color: black;
    }

    .site-main {
        padding-top: 0;
    }

    a {
        text-decoration: underline;
    }

    .card {
        border: 1px solid #ddd;
        box-shadow: none;
    }
}

/* ========== 접근성 - 동작 감소 선호 ========== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* ========== 다크모드 시스템 설정 (이미 다크 테마이므로 추가 변경 불필요) ========== */
@media (prefers-color-scheme: light) {
    /* 라이트 모드 사용자에게도 cosmic 다크 테마 유지 */
}