/* Responsive Design */

/* Mobile First Approach */

/* Extra Small Devices (phones, 576px and down) */
@media (max-width: 575.98px) {
    .container {
        padding: 0 var(--spacing-3);
    }
    
    .header .container {
        flex-direction: column;
        gap: var(--spacing-2);
        padding: var(--spacing-2);
        align-items: stretch;
    }
    
    /* 헤더 높이 줄이기 */
    .header {
        padding: var(--spacing-2) 0;
    }
    
    .logo {
        font-size: var(--font-size-lg);
        text-align: center;
        order: 1;
    }
    
    /* 검색창 모바일 최적화 */
    .search-container {
        order: 2;
        width: 100%;
        margin: var(--spacing-1) 0;
    }
    
    .search-input {
        font-size: var(--font-size-sm);
        padding: var(--spacing-2);
    }
    
    /* 헤더 언어 선택기 모바일에서 숨김 */
    .header-language-selector {
        display: none;
    }
    
    .header-language-selector .language-select {
        min-width: 140px;
        font-size: var(--font-size-base);
        padding: var(--spacing-3) var(--spacing-4);
        width: auto;
        flex-shrink: 0;
        background-color: var(--bg-card);
        border: 2px solid var(--primary-color);
        box-shadow: var(--shadow-md);
    }
    
    .header-language-selector .language-select:focus {
        box-shadow: 0 0 0 3px rgba(90, 212, 212, 0.2);
    }
    
    /* 네비게이션 메뉴 모바일에서 숨김 */
    .nav {
        display: none;
    }
    
    .nav-link {
        font-size: var(--font-size-sm);
        padding: var(--spacing-1) var(--spacing-2);
    }
    
    .converter-header h2 {
        font-size: var(--font-size-2xl);
    }
    
    .converter-description {
        font-size: var(--font-size-base);
    }
    
    .input-group {
        flex-direction: column;
        gap: var(--spacing-3);
    }
    
    .input-wrapper {
        width: 100%;
    }
    
    .swap-btn {
        align-self: center;
        margin: var(--spacing-2) 0;
    }
    
    .converter-actions {
        flex-direction: column;
        gap: var(--spacing-3);
    }
    
    .convert-btn,
    .clear-btn {
        width: 100%;
        min-width: auto;
    }
    
    .converter-card,
    .info-card,
    .examples-card,
    .history-card {
        padding: var(--spacing-5);
    }
    
    .examples-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-4);
    }
    
    .unit-info {
        gap: var(--spacing-4);
    }
    
    .unit-item {
        padding: var(--spacing-4);
    }
    
    .history-item {
        flex-direction: column;
        gap: var(--spacing-2);
        text-align: center;
    }
}

/* Small Devices (landscape phones, 576px and up) */
@media (min-width: 576px) and (max-width: 767.98px) {
    .header .container {
        padding: var(--spacing-4);
    }
    
    .nav-list {
        gap: var(--spacing-4);
    }
    
    .input-group {
        gap: var(--spacing-3);
    }
    
    .converter-actions {
        gap: var(--spacing-3);
    }
    
    .examples-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-4);
    }
}

/* Medium Devices (tablets, 768px and up) */
@media (min-width: 768px) and (max-width: 991.98px) {
    .header .container {
        padding: var(--spacing-5);
    }
    
    .nav-list {
        gap: var(--spacing-5);
    }
    
    .converter-form {
        max-width: 500px;
    }
    
    .examples-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

/* Large Devices (desktops, 992px and up) */
@media (min-width: 992px) and (max-width: 1199.98px) {
    .converter-form {
        max-width: 550px;
    }
    
    .examples-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
}

/* Extra Large Devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
    .container {
        max-width: 1400px;
    }
    
    .converter-form {
        max-width: 600px;
    }
    
    .examples-grid {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    }
}

/* Ultra Wide Screens (1400px and up) */
@media (min-width: 1400px) {
    .container {
        max-width: 1600px;
    }
    
    .main .container {
        grid-template-columns: 2fr 1fr;
        gap: var(--spacing-10);
    }
    
    .converter-section {
        grid-column: 1;
    }
    
    .info-section,
    .examples-section,
    .history-section {
        grid-column: 2;
    }
    
    .examples-section {
        grid-row: 1 / 3;
    }
    
    .history-section {
        grid-row: 3;
    }
}

/* Landscape Orientation */
@media (orientation: landscape) and (max-height: 600px) {
    .header {
        position: relative;
    }
    
    .main {
        padding: var(--spacing-4) 0;
    }
    
    .converter-card,
    .info-card,
    .examples-card,
    .history-card {
        padding: var(--spacing-4);
    }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .converter-input,
    .unit-select,
    .convert-btn,
    .clear-btn {
        border-width: 1px;
    }
}

/* Reduced Motion (Accessibility) */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .fade-in {
        animation: none;
    }
    
    .example-item:hover {
        transform: none;
    }
    
    .convert-btn:hover {
        transform: none;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #F0F2F5;
        --bg-secondary: #E0E2E5;
        --bg-card: #FFFFFF;
        --bg-input: #F8F8FA;
        --text-primary: #555555;
        --text-secondary: #777777;
        --text-muted: #AAAAAA;
        --text-white: #FFFFFF;
        --border-light: #E5E7EB;
        --border-medium: #D1D5DB;
    }
    
    body {
        background-color: var(--bg-primary);
        color: var(--text-primary);
    }
    
    .converter-card,
    .info-card,
    .examples-card,
    .history-card {
        background-color: var(--bg-card);
        border-color: var(--border-light);
    }
    
    .converter-input,
    .unit-select {
        background-color: var(--bg-input);
        border-color: var(--border-light);
        color: var(--text-primary);
    }
    
    .converter-input:focus,
    .unit-select:focus {
        border-color: var(--primary-color);
    }
    
    .unit-item {
        background-color: var(--bg-secondary);
        border-color: var(--border-light);
    }
    
    .example-item {
        background-color: var(--bg-card);
        border-color: var(--border-light);
    }
    
    .history-item {
        background-color: var(--bg-card);
        border-color: var(--border-light);
    }
    
    .history-item:hover {
        background-color: var(--bg-secondary);
    }
}

/* Print Styles Enhancement */
@media print {
    @page {
        margin: 1in;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
        color: var(--text-primary);
        background: var(--bg-card);
    }
    
    .converter-card,
    .info-card,
    .examples-card {
        break-inside: avoid;
        margin-bottom: 1em;
    }
    
    .converter-input,
    .unit-select {
        border: 1px solid var(--border-light);
        background: var(--bg-input);
    }
    
    .convert-btn,
    .clear-btn,
    .swap-btn {
        display: none;
    }
}

/* Focus Visible for Better Accessibility */
@media (prefers-reduced-motion: no-preference) {
    .nav-link:focus-visible,
    .convert-btn:focus-visible,
    .clear-btn:focus-visible,
    .swap-btn:focus-visible {
        outline: 2px solid var(--primary-color);
        outline-offset: 2px;
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .nav-link,
    .convert-btn,
    .clear-btn,
    .swap-btn {
        min-height: 44px;
        min-width: 44px;
    }
    
    .converter-input,
    .unit-select {
        min-height: 44px;
        font-size: 16px; /* Prevents zoom on iOS */
    }
    
    .example-item:hover {
        transform: none;
    }
    
    .convert-btn:hover {
        transform: none;
    }
}

/* Container Query Support (Future) */
@supports (container-type: inline-size) {
    .converter-card {
        container-type: inline-size;
    }
    
    @container (max-width: 400px) {
        .input-group {
            flex-direction: column;
        }
        
        .converter-actions {
            flex-direction: column;
        }
    }
} 

/* 변환팁 버튼 반응형 */
@media (max-width: 768px) {
    .tips-button-container {
        margin-top: 1.5rem;
        padding-top: 1rem;
    }
    
    .tips-btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.85rem;
    }
    
    .tips-icon {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .tips-btn {
        padding: 0.5rem 1rem;
        font-size: 0.8rem;
        gap: 0.4rem;
    }
    
    .tips-icon {
        font-size: 0.9rem;
    }
}