/* 누룩 당화력 계산기 - 한국 전통 양조 테마 */

/* CSS Variables - 단청 영감 컬러 팔레트 */
:root {
    /* 전통 단청 색상 */
    --dancheong-red: #C73E3A;
    --dancheong-blue: #1E4D8C;
    --dancheong-green: #2D5A4A;
    --dancheong-yellow: #D4A84B;
    --dancheong-white: #F5F0E6;
    
    /* 누룩/발효 영감 색상 */
    --nuruk-cream: #F8F3E8;
    --nuruk-beige: #E8DCC8;
    --nuruk-brown: #8B7355;
    --nuruk-dark: #4A3C2A;
    
    /* 기능적 색상 */
    --success: #2D6A4F;
    --warning: #C77700;
    --error: #B83232;
    --info: #1E4D8C;
    
    /* 그림자 */
    --shadow-sm: 0 1px 2px rgba(74, 60, 42, 0.1);
    --shadow-md: 0 4px 12px rgba(74, 60, 42, 0.12);
    --shadow-lg: 0 8px 24px rgba(74, 60, 42, 0.15);
    
    /* 간격 */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* 폰트 */
    --font-display: 'Noto Serif KR', serif;
    --font-body: 'Noto Sans KR', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-body);
    background: linear-gradient(135deg, var(--nuruk-cream) 0%, var(--nuruk-beige) 100%);
    min-height: 100vh;
    color: var(--nuruk-dark);
    line-height: 1.6;
}

/* 배경 장식 패턴 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 20%, rgba(199, 62, 58, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(30, 77, 140, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* 전통 문양 장식 */
.traditional-pattern {
    position: fixed;
    width: 120px;
    height: 120px;
    opacity: 0.05;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Ccircle cx='50' cy='50' r='40' fill='none' stroke='%234A3C2A' stroke-width='2'/%3E%3Ccircle cx='50' cy='50' r='25' fill='none' stroke='%234A3C2A' stroke-width='1.5'/%3E%3Cpath d='M50 10 L50 90 M10 50 L90 50' stroke='%234A3C2A' stroke-width='1'/%3E%3C/svg%3E");
    pointer-events: none;
}

.traditional-pattern.top-left {
    top: 2rem;
    left: 2rem;
}

.traditional-pattern.bottom-right {
    bottom: 2rem;
    right: 2rem;
    transform: rotate(45deg);
}

/* Container */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--space-md);
}

/* Header */
.header {
    text-align: center;
    padding: var(--space-xl) 0;
    margin-bottom: var(--space-lg);
}

.header__icon {
    font-size: 3.5rem;
    margin-bottom: var(--space-md);
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}

.header__title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--nuruk-dark);
    margin-bottom: var(--space-xs);
    letter-spacing: 0.05em;
}

.header__subtitle {
    font-size: 0.95rem;
    color: var(--nuruk-brown);
    font-weight: 400;
}

/* Card */
.card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    padding: var(--space-xl);
    margin-bottom: var(--space-lg);
    border: 1px solid rgba(232, 220, 200, 0.5);
    backdrop-filter: blur(10px);
}

.card__header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 2px solid var(--nuruk-beige);
}

.card__icon {
    width: 28px;
    height: 28px;
    color: var(--dancheong-red);
}

.card__title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--nuruk-dark);
}

/* Form Elements */
.form-grid {
    display: grid;
    gap: var(--space-lg);
}

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

@media (max-width: 600px) {
    .form-grid--two {
        grid-template-columns: 1fr;
    }
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.form-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--nuruk-brown);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.form-label__hint {
    font-size: 0.75rem;
    color: var(--nuruk-brown);
    opacity: 0.7;
    font-weight: 400;
}

.form-input,
.form-select {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-family: var(--font-body);
    border: 2px solid var(--nuruk-beige);
    border-radius: 10px;
    background: white;
    color: var(--nuruk-dark);
    transition: all 0.2s ease;
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--dancheong-blue);
    box-shadow: 0 0 0 3px rgba(30, 77, 140, 0.1);
}

.form-input::placeholder {
    color: var(--nuruk-brown);
    opacity: 0.5;
}

.form-input--mono {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    text-align: right;
}

/* Select 스타일 */
.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%238B7355' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
    cursor: pointer;
}

/* Range Slider */
.range-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.range-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    color: var(--nuruk-brown);
}

.range-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: linear-gradient(to right, 
        var(--dancheong-red) 0%, 
        var(--dancheong-red) var(--ratio-value, 50%), 
        var(--dancheong-blue) var(--ratio-value, 50%), 
        var(--dancheong-blue) 100%);
    cursor: pointer;
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: white;
    border: 3px solid var(--nuruk-dark);
    box-shadow: var(--shadow-md);
    cursor: grab;
    transition: transform 0.15s ease;
}

.range-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.range-slider::-webkit-slider-thumb:active {
    cursor: grabbing;
    transform: scale(0.95);
}

/* Result Cards */
.results-grid {
    display: grid;
    gap: var(--space-md);
}

.result-card {
    background: linear-gradient(135deg, var(--nuruk-cream) 0%, white 100%);
    border-radius: 12px;
    padding: var(--space-lg);
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.result-card--traditional {
    border-color: var(--dancheong-red);
    background: linear-gradient(135deg, rgba(199, 62, 58, 0.05) 0%, white 100%);
}

.result-card--improved {
    border-color: var(--dancheong-blue);
    background: linear-gradient(135deg, rgba(30, 77, 140, 0.05) 0%, white 100%);
}

.result-card--mixed {
    border-color: var(--dancheong-green);
    background: linear-gradient(135deg, rgba(45, 90, 74, 0.05) 0%, white 100%);
}

.result-card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-sm);
}

.result-card__label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--nuruk-brown);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.result-card__badge {
    font-size: 0.7rem;
    padding: 0.15rem 0.5rem;
    border-radius: 100px;
    font-weight: 500;
}

.result-card--traditional .result-card__badge {
    background: var(--dancheong-red);
    color: white;
}

.result-card--improved .result-card__badge {
    background: var(--dancheong-blue);
    color: white;
}

.result-card--mixed .result-card__badge {
    background: var(--dancheong-green);
    color: white;
}

.result-card__value {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    color: var(--nuruk-dark);
    line-height: 1.2;
}

.result-card__unit {
    font-size: 1rem;
    font-weight: 400;
    color: var(--nuruk-brown);
    margin-left: var(--space-xs);
}

.result-card__detail {
    font-size: 0.8rem;
    color: var(--nuruk-brown);
    margin-top: var(--space-xs);
    opacity: 0.8;
}

/* Mixed Result Special Layout */
.mixed-result {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    margin-top: var(--space-sm);
}

.mixed-result__item {
    text-align: center;
    padding: var(--space-md);
    border-radius: 8px;
    background: rgba(255,255,255,0.7);
}

.mixed-result__item--traditional {
    border-left: 3px solid var(--dancheong-red);
}

.mixed-result__item--improved {
    border-left: 3px solid var(--dancheong-blue);
}

.mixed-result__label {
    font-size: 0.75rem;
    color: var(--nuruk-brown);
    margin-bottom: var(--space-xs);
}

.mixed-result__value {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--nuruk-dark);
}

/* Info Box */
.info-box {
    background: linear-gradient(135deg, rgba(212, 168, 75, 0.1) 0%, rgba(212, 168, 75, 0.05) 100%);
    border: 1px solid rgba(212, 168, 75, 0.3);
    border-radius: 10px;
    padding: var(--space-md);
    margin-top: var(--space-md);
}

.info-box__title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--warning);
    margin-bottom: var(--space-xs);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.info-box__content {
    font-size: 0.8rem;
    color: var(--nuruk-brown);
    line-height: 1.5;
}

/* Warning Box */
.warning-box {
    background: linear-gradient(135deg, rgba(184, 50, 50, 0.08) 0%, rgba(184, 50, 50, 0.03) 100%);
    border: 1px solid rgba(184, 50, 50, 0.25);
    border-radius: 10px;
    padding: var(--space-md);
    margin-top: var(--space-md);
    display: none;
}

.warning-box.visible {
    display: block;
    animation: shake 0.4s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-4px); }
    40%, 80% { transform: translateX(4px); }
}

.warning-box__title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--error);
    margin-bottom: var(--space-xs);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.warning-box__content {
    font-size: 0.8rem;
    color: var(--nuruk-brown);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.875rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: var(--font-body);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn--primary {
    background: linear-gradient(135deg, var(--dancheong-red) 0%, #A33230 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(199, 62, 58, 0.3);
}

.btn--primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(199, 62, 58, 0.4);
}

.btn--secondary {
    background: white;
    color: var(--nuruk-dark);
    border: 2px solid var(--nuruk-beige);
}

.btn--secondary:hover:not(:disabled) {
    background: var(--nuruk-cream);
    border-color: var(--nuruk-brown);
}

.btn--outline {
    background: transparent;
    color: var(--dancheong-blue);
    border: 2px solid var(--dancheong-blue);
}

.btn--outline:hover:not(:disabled) {
    background: var(--dancheong-blue);
    color: white;
}

.btn--small {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

.btn-group {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-top: var(--space-lg);
}

/* Correction Factors Section */
.correction-section {
    background: var(--nuruk-cream);
    border-radius: 12px;
    padding: var(--space-lg);
    margin-top: var(--space-lg);
}

.correction-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
}

.correction-header__title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--nuruk-dark);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.correction-header__toggle {
    width: 24px;
    height: 24px;
    color: var(--nuruk-brown);
    transition: transform 0.3s ease;
}

.correction-header__toggle.open {
    transform: rotate(180deg);
}

.correction-content {
    display: none;
    padding-top: var(--space-lg);
}

.correction-content.open {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

/* SP Info */
.sp-info {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.85rem;
    color: var(--nuruk-brown);
    margin-top: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: rgba(30, 77, 140, 0.05);
    border-radius: 8px;
}

.sp-info__range {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--dancheong-blue);
}

/* Total SP Display */
.total-sp-display {
    background: linear-gradient(135deg, var(--nuruk-dark) 0%, #3D3225 100%);
    color: white;
    border-radius: 12px;
    padding: var(--space-lg);
    text-align: center;
    margin-top: var(--space-lg);
}

.total-sp-display__label {
    font-size: 0.85rem;
    opacity: 0.8;
    margin-bottom: var(--space-xs);
}

.total-sp-display__value {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 700;
}

.total-sp-display__unit {
    font-size: 1rem;
    opacity: 0.7;
    margin-left: var(--space-xs);
}

.total-sp-display__adjusted {
    font-size: 0.8rem;
    opacity: 0.7;
    margin-top: var(--space-xs);
}

/* History Section */
.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md);
    background: white;
    border-radius: 10px;
    border: 1px solid var(--nuruk-beige);
    transition: all 0.2s ease;
}

.history-item:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--dancheong-blue);
}

.history-item__info {
    flex: 1;
}

.history-item__date {
    font-size: 0.75rem;
    color: var(--nuruk-brown);
    opacity: 0.7;
}

.history-item__summary {
    font-size: 0.9rem;
    color: var(--nuruk-dark);
    margin-top: var(--space-xs);
}

.history-item__type {
    font-size: 0.7rem;
    padding: 0.15rem 0.5rem;
    border-radius: 100px;
    background: var(--nuruk-beige);
    color: var(--nuruk-brown);
}

.history-item__actions {
    display: flex;
    gap: var(--space-sm);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--nuruk-brown);
}

.empty-state__icon {
    font-size: 3rem;
    opacity: 0.3;
    margin-bottom: var(--space-md);
}

.empty-state__text {
    font-size: 0.95rem;
}

/* Tab Navigation */
.tab-nav {
    display: flex;
    gap: var(--space-xs);
    margin-bottom: var(--space-lg);
    border-bottom: 2px solid var(--nuruk-beige);
    padding-bottom: var(--space-xs);
}

.tab-btn {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--nuruk-brown);
    background: none;
    border: none;
    cursor: pointer;
    border-radius: 8px 8px 0 0;
    transition: all 0.2s ease;
    position: relative;
}

.tab-btn:hover {
    color: var(--nuruk-dark);
    background: rgba(232, 220, 200, 0.3);
}

.tab-btn.active {
    color: var(--dancheong-red);
    background: rgba(199, 62, 58, 0.08);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--dancheong-red);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: calc(env(safe-area-inset-bottom, 0px) + 80px);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--nuruk-dark);
    color: white;
    padding: var(--space-md) var(--space-lg);
    border-radius: 10px;
    font-size: 0.9rem;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    opacity: 0;
    transition: all 0.3s ease;
}

.toast.visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast--success {
    background: var(--success);
}

.toast--error {
    background: var(--error);
}

/* PWA Install Banner */
.pwa-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    padding: var(--space-md);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
    display: none;
    z-index: 999;
    padding-bottom: calc(var(--space-md) + env(safe-area-inset-bottom, 0px));
}

.pwa-banner.visible {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}

.pwa-banner__text {
    flex: 1;
    font-size: 0.85rem;
    color: var(--nuruk-dark);
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--space-xl) 0;
    color: var(--nuruk-brown);
    font-size: 0.8rem;
    opacity: 0.7;
}

/* Responsive */
@media (max-width: 600px) {
    .header__title {
        font-size: 1.5rem;
    }
    
    .card {
        padding: var(--space-lg);
        border-radius: 12px;
    }
    
    .result-card__value {
        font-size: 1.75rem;
    }
    
    .total-sp-display__value {
        font-size: 2rem;
    }
    
    .mixed-result {
        grid-template-columns: 1fr;
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn-group .btn {
        width: 100%;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
    }
    
    .btn-group,
    .tab-nav,
    .pwa-banner,
    .footer {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

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

/* Focus Visible */
:focus-visible {
    outline: 2px solid var(--dancheong-blue);
    outline-offset: 2px;
}

/* Selection */
::selection {
    background: rgba(199, 62, 58, 0.2);
}