/* Apple Design System Variables */
:root {
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Colors - Light Mode */
    --bg-primary: #f5f5f7;
    --bg-secondary: #ffffff;
    --bg-tertiary: #fbfbfd;
    
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --text-tertiary: #a1a1a6;
    
    --accent-blue: #0071e3;
    --accent-blue-hover: #0077ed;
    --accent-green: #34c759;
    --accent-orange: #ff9500;
    --accent-red: #ff3b30;
    
    --border-color: #d2d2d7;
    --border-light: #e8e8ed;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 28px rgba(0, 0, 0, 0.12);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #000000;
        --bg-secondary: #1c1c1e;
        --bg-tertiary: #2c2c2e;
        
        --text-primary: #ffffff;
        --text-secondary: #98989d;
        --text-tertiary: #636366;
        
        --accent-blue: #0a84ff;
        --accent-blue-hover: #409cff;
        
        --border-color: #38383a;
        --border-light: #2c2c2e;
        
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 8px 28px rgba(0, 0, 0, 0.5);
    }
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    padding: 40px 20px;
}

/* Container */
.container {
    max-width: 800px;
    margin: 0 auto;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 40px;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 12px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--accent-blue);
}

.header h1 {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.015em;
}

.subtitle {
    font-size: 17px;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Card Component */
.card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: 20px;
    overflow: hidden;
    transition: box-shadow var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-light);
}

.card-header h2 {
    font-size: 19px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.card-content {
    padding: 24px;
}

/* Badge */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    border-radius: 100px;
}

/* API Config */
.api-config .card-header {
    cursor: pointer;
    user-select: none;
}

.toggle-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    color: var(--text-secondary);
    transition: transform var(--transition-fast);
}

.toggle-btn svg {
    width: 24px;
    height: 24px;
}

.toggle-btn.collapsed {
    transform: rotate(-90deg);
}

/* Form Elements */
.form-group {
    margin-bottom: 16px;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.15);
}

.form-group input::placeholder {
    color: var(--text-tertiary);
}

/* Upload Area */
.upload-section {
    padding: 0;
}

.upload-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px 24px;
    cursor: pointer;
    transition: background-color var(--transition-fast);
    border-radius: var(--radius-lg);
}

.upload-area:hover {
    background-color: var(--bg-tertiary);
}

.upload-area.dragover {
    background-color: rgba(0, 113, 227, 0.05);
    border: 2px dashed var(--accent-blue);
}

.upload-icon {
    width: 64px;
    height: 64px;
    color: var(--accent-blue);
    margin-bottom: 16px;
}

.upload-icon svg {
    width: 100%;
    height: 100%;
}

.upload-text {
    font-size: 17px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.upload-hint {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Buttons */
.action-section {
    display: flex;
    justify-content: center;
    margin: 32px 0;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    font-family: inherit;
    color: #ffffff;
    background: var(--accent-blue);
    border: none;
    border-radius: 100px;
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
    min-width: 180px;
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-blue-hover);
    transform: scale(1.02);
}

.btn-primary:active:not(:disabled) {
    transform: scale(0.98);
}

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

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    color: var(--accent-blue);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.btn-secondary:hover {
    background-color: rgba(0, 113, 227, 0.05);
}

.btn-secondary svg {
    width: 16px;
    height: 16px;
}

/* Loader */
.btn-loader {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Content Display */
.reference-content,
.result-content {
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-primary);
    white-space: pre-wrap;
    word-wrap: break-word;
    max-height: 400px;
    overflow-y: auto;
    padding-right: 8px;
}

/* Slogan Display */
.slogan-content {
    font-size: 18px;
    font-weight: 600;
    color: var(--accent-blue);
    text-align: center;
    padding: 16px 20px;
    margin-bottom: 16px;
    background: linear-gradient(135deg, rgba(0, 113, 227, 0.08) 0%, rgba(0, 113, 227, 0.03) 100%);
    border-radius: var(--radius-md);
    border: 1px solid rgba(0, 113, 227, 0.15);
    letter-spacing: 0.02em;
}

.slogan-content.hidden {
    display: none !important;
}

/* Psychic Name Display */
.psychic-name {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    padding: 20px 24px;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-primary) 100%);
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
    letter-spacing: 0.03em;
}

.psychic-name.hidden {
    display: none !important;
}

/* User Name Section */
.user-name-section {
    margin-bottom: 20px;
}

.user-name-section .form-group {
    margin-bottom: 0;
}

.user-name-section .form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.user-name-section input {
    font-size: 16px;
    font-weight: 500;
}

@media (prefers-color-scheme: dark) {
    .slogan-content {
        background: linear-gradient(135deg, rgba(10, 132, 255, 0.12) 0%, rgba(10, 132, 255, 0.05) 100%);
        border-color: rgba(10, 132, 255, 0.2);
    }

    .psychic-name {
        background: linear-gradient(135deg, var(--bg-tertiary) 0%, #1a1a1c 100%);
        border-color: var(--border-color);
    }
}

/* Custom Scrollbar */
.reference-content::-webkit-scrollbar,
.result-content::-webkit-scrollbar {
    width: 8px;
}

.reference-content::-webkit-scrollbar-track,
.result-content::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

.reference-content::-webkit-scrollbar-thumb,
.result-content::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.reference-content::-webkit-scrollbar-thumb:hover,
.result-content::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 24px;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: #ffffff;
    font-size: 15px;
    font-weight: 500;
    border-radius: 100px;
    box-shadow: var(--shadow-lg);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
    z-index: 1000;
}

.toast.hidden {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
    pointer-events: none;
}

.toast-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-green);
    border-radius: 50%;
    font-size: 12px;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Results Container */
.results-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.results-container.hidden {
    display: none !important;
}

/* Result Header Left */
.result-header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Similarity Badge */
.similarity-badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    font-size: 13px;
    font-weight: 600;
    border-radius: 100px;
}

.similarity-25 {
    background: linear-gradient(135deg, #34c759 0%, #30d158 100%);
    color: #ffffff;
}

.similarity-50 {
    background: linear-gradient(135deg, #ff9500 0%, #ffaa33 100%);
    color: #ffffff;
}

.similarity-75 {
    background: linear-gradient(135deg, #0071e3 0%, #409cff 100%);
    color: #ffffff;
}

@media (prefers-color-scheme: dark) {
    .similarity-25 {
        background: linear-gradient(135deg, #30d158 0%, #34c759 100%);
    }
    
    .similarity-50 {
        background: linear-gradient(135deg, #ffaa33 0%, #ff9500 100%);
    }
    
    .similarity-75 {
        background: linear-gradient(135deg, #409cff 0%, #0a84ff 100%);
    }
}

/* Responsive */
@media (max-width: 640px) {
    body {
        padding: 20px 16px;
    }
    
    .header h1 {
        font-size: 24px;
    }
    
    .subtitle {
        font-size: 15px;
    }
    
    .card-header {
        padding: 16px 20px;
    }
    
    .card-content {
        padding: 20px;
    }
    
    .upload-area {
        padding: 36px 20px;
    }
    
    .upload-icon {
        width: 48px;
        height: 48px;
    }
    
    .result-header-left {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}