/* =====================================================
   Steps Life Calculator - CSS
   Neobrutalism Design System
   2-Column Layout (Desktop) / 1-Column (Mobile)
   ===================================================== */

/* Global box-sizing */
.steps-life-calculator-container,
.steps-life-calculator-container *,
.steps-life-calculator-container *::before,
.steps-life-calculator-container *::after {
    box-sizing: border-box;
}

/* =====================================================
   CSS Variables - Light Mode (Default)
   ===================================================== */
.steps-life-calculator-container {
    /* Background colors */
    --bg-primary: #f5f5f0;
    --bg-secondary: #fff;
    --bg-section: #fff;
    
    /* Borders */
    --border-color: #333;
    
    /* Text colors */
    --text-primary: #222;
    --text-secondary: #555;
    --text-light: #666;
    
    /* Brand colors */
    --color-accent: #3498db;
    --color-success: #27ae60;
    --color-warning: #f39c12;
    --color-danger: #e74c3c;
    --color-purple: #9b59b6;
    --color-teal: #1abc9c;
    
    /* Shadows (neobrutalism) */
    --shadow-sm: 2px 2px 0 rgba(0,0,0,0.1);
    --shadow-md: 4px 4px 0 rgba(0,0,0,0.15);
    --shadow-lg: 8px 8px 0 rgba(0,0,0,0.15);
    
    /* Border radius */
    --radius-container: 8px;
    --radius-section: 6px;
    --radius-button: 4px;
    --radius-input: 4px;
    
    /* Input focus */
    --input-focus-bg: #fffacd;
    
    /* Header title */
    --title-color: #2c3e50;
    --title-shadow: 2px 2px 0 rgba(255,255,255,0.5);
    
    /* Button hover background */
    --btn-hover-overlay: rgba(0,0,0,0.1);
    
    /* Copy button background */
    --copy-btn-bg: #fff;
    --copy-btn-hover-bg: #f0f0f0;
    
    /* Rank colors */
    --rank-bronze-bg: #cd7f32;
    --rank-silver-bg: #c0c0c0;
    --rank-gold-bg: #ffd700;
    --rank-platinum-bg: #0ea5e9;
    --rank-diamond-bg: #9b59b6;
    --rank-legend-bg: #ec4899;
}

/* =====================================================
   Dark Mode (Manual Toggle)
   ===================================================== */
.steps-life-calculator-container.dark {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-section: #2d2d2d;
    --border-color: #e0e0e0;
    --text-primary: #e8e8e8;
    --text-secondary: #b0b0b0;
    --text-light: #909090;
    --color-accent: #5dade2;
    --color-success: #52c77a;
    --color-warning: #f5b041;
    --color-danger: #ec7063;
    --color-purple: #af7ac5;
    --color-teal: #48d1cc;
    --shadow-sm: 2px 2px 0 rgba(255,255,255,0.08);
    --shadow-md: 4px 4px 0 rgba(255,255,255,0.12);
    --shadow-lg: 8px 8px 0 rgba(255,255,255,0.12);
    --input-focus-bg: #3a3a3a;
    --title-color: #7fb3d5;
    --title-shadow: 2px 2px 0 rgba(0,0,0,0.5);
    --btn-hover-overlay: rgba(255,255,255,0.1);
    --copy-btn-bg: #3a3a3a;
    --copy-btn-hover-bg: #4a4a4a;
}

/* =====================================================
   System Dark Mode Auto Detection
   ===================================================== */
@media (prefers-color-scheme: dark) {
    .steps-life-calculator-container:not(.dark):not(.light) {
        --bg-primary: #1a1a1a;
        --bg-secondary: #2d2d2d;
        --bg-section: #2d2d2d;
        --border-color: #e0e0e0;
        --text-primary: #e8e8e8;
        --text-secondary: #b0b0b0;
        --text-light: #909090;
        --color-accent: #5dade2;
        --color-success: #52c77a;
        --color-warning: #f5b041;
        --color-danger: #ec7063;
        --color-purple: #af7ac5;
        --color-teal: #48d1cc;
        --shadow-sm: 2px 2px 0 rgba(255,255,255,0.08);
        --shadow-md: 4px 4px 0 rgba(255,255,255,0.12);
        --shadow-lg: 8px 8px 0 rgba(255,255,255,0.12);
        --input-focus-bg: #3a3a3a;
        --title-color: #7fb3d5;
        --title-shadow: 2px 2px 0 rgba(0,0,0,0.5);
        --btn-hover-overlay: rgba(255,255,255,0.1);
        --copy-btn-bg: #3a3a3a;
        --copy-btn-hover-bg: #4a4a4a;
    }
}

/* =====================================================
   Main Container
   ===================================================== */
.steps-life-calculator-container {
    position: relative;
    max-width: 1000px;
    width: 100%;
    margin: 8px auto;
    padding: 8px;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-container);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Malgun Gothic', sans-serif;
    color: var(--text-primary);
    box-shadow: var(--shadow-lg);
    line-height: 1.5;
}

/* =====================================================
   Dark Mode Toggle Button
   ===================================================== */
.dark-mode-toggle {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 6px 10px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 2px 2px 0 rgba(0,0,0,0.15);
    font-size: 17.5px;
    font-weight: 600;
    color: var(--text-primary);
    z-index: 10;
    border-radius: var(--radius-button);
}

.dark-mode-toggle:hover {
    transform: translate(0.5px, 0.5px);
    box-shadow: 1.5px 1.5px 0 rgba(0,0,0,0.15);
}

.dark-mode-toggle:active {
    transform: translate(2px, 2px);
    box-shadow: none;
}

/* Dark mode shadow adjustment */
.steps-life-calculator-container.dark .dark-mode-toggle {
    box-shadow: 2px 2px 0 rgba(255,255,255,0.1);
}

.steps-life-calculator-container.dark .dark-mode-toggle:hover {
    box-shadow: 1.5px 1.5px 0 rgba(255,255,255,0.1);
}

/* =====================================================
   Header
   ===================================================== */
.header {
    text-align: center;
    margin-bottom: 8px;
    padding: 8px;
}

.main-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--title-color);
    margin: 0 0 4px 0;
    text-shadow: var(--title-shadow);
}

.subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin: 0;
}

/* =====================================================
   2-Column Grid Layout
   ===================================================== */
.main-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

/* =====================================================
   Section Styles
   ===================================================== */
.input-section,
.result-section {
    background: var(--bg-section);
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-section);
    box-shadow: var(--shadow-md);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 8px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border-color);
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
}

.section-header svg {
    width: 18px;
    height: 18px;
    stroke: var(--color-accent);
}

/* =====================================================
   Input Groups
   ===================================================== */
.input-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 8px;
}

.input-group {
    margin-bottom: 0;
}

.input-group label {
    display: block;
    margin-bottom: 4px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper input {
    width: 100%;
    padding: 7px;
    padding-right: 40px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-input);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 18px;
    font-family: 'Courier New', monospace;
    font-weight: 700;
    transition: all 0.2s;
    box-shadow: var(--shadow-sm);
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--color-accent);
    background: var(--input-focus-bg);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.1);
}

.input-wrapper input::-webkit-inner-spin-button,
.input-wrapper input::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.input-wrapper input[type=number] {
    -moz-appearance: textfield;
}

.input-unit {
    position: absolute;
    right: 10px;
    color: var(--text-light);
    font-size: 14px;
    font-weight: 500;
    pointer-events: none;
}

/* =====================================================
   Preset Buttons
   ===================================================== */
.preset-buttons {
    display: flex;
    gap: 6px;
    margin-bottom: 8px;
}

.preset-btn {
    flex: 1;
    padding: 6px 4px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-button);
    cursor: pointer;
    transition: all 0.15s;
    box-shadow: 2px 2px 0 rgba(0,0,0,0.15);
    text-align: center;
    color: var(--text-primary);
}

.preset-btn:hover {
    transform: translate(0.5px, 0.5px);
    box-shadow: 1.5px 1.5px 0 rgba(0,0,0,0.15);
    background: var(--color-accent);
    color: #fff;
}

.preset-btn.active {
    background: var(--color-accent);
    color: #fff;
    transform: translate(2px, 2px);
    box-shadow: none;
}

.preset-label {
    display: block;
    font-size: 15px;
    font-weight: 600;
    color: inherit;
}

.preset-value {
    display: block;
    font-size: 12px;
    opacity: 0.8;
    color: inherit;
}

/* Dark mode shadow adjustment for preset buttons */
.steps-life-calculator-container.dark .preset-btn {
    box-shadow: 2px 2px 0 rgba(255,255,255,0.1);
}

.steps-life-calculator-container.dark .preset-btn:hover {
    box-shadow: 1.5px 1.5px 0 rgba(255,255,255,0.1);
}

/* =====================================================
   Calculate Button (Main Action)
   ===================================================== */
.calculate-btn {
    width: 100%;
    padding: 8px 16px;
    margin-bottom: 6px;
    background: var(--color-accent);
    color: #fff;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-button);
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
    box-shadow: 4px 4px 0 rgba(0,0,0,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.calculate-btn:hover {
    filter: brightness(1.05);
    transform: translate(1px, 1px);
    box-shadow: 3px 3px 0 rgba(0,0,0,0.2);
}

.calculate-btn:active {
    transform: translate(4px, 4px);
    box-shadow: none;
}

.calculate-btn svg {
    width: 18px;
    height: 18px;
}

/* Dark mode shadow for calculate button */
.steps-life-calculator-container.dark .calculate-btn {
    box-shadow: 4px 4px 0 rgba(255,255,255,0.15);
}

.steps-life-calculator-container.dark .calculate-btn:hover {
    box-shadow: 3px 3px 0 rgba(255,255,255,0.15);
}

/* =====================================================
   Secondary Buttons
   ===================================================== */
.button-group {
    display: flex;
    gap: 6px;
    margin-bottom: 8px;
}

.sample-btn,
.reset-btn {
    flex: 1;
    padding: 6px 12px;
    font-size: 16px;
    font-weight: 500;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-button);
    cursor: pointer;
    transition: all 0.15s;
    box-shadow: 2px 2px 0 rgba(0,0,0,0.2);
}

.sample-btn {
    background: var(--color-success);
    color: #fff;
}

.reset-btn {
    background: var(--color-warning);
    color: #fff;
}

.sample-btn:hover,
.reset-btn:hover {
    transform: translate(0.5px, 0.5px);
    box-shadow: 1.5px 1.5px 0 rgba(0,0,0,0.2);
}

.sample-btn:active,
.reset-btn:active {
    transform: translate(2px, 2px);
    box-shadow: none;
}

/* Dark mode shadow for secondary buttons */
.steps-life-calculator-container.dark .sample-btn,
.steps-life-calculator-container.dark .reset-btn {
    box-shadow: 2px 2px 0 rgba(255,255,255,0.15);
}

.steps-life-calculator-container.dark .sample-btn:hover,
.steps-life-calculator-container.dark .reset-btn:hover {
    box-shadow: 1.5px 1.5px 0 rgba(255,255,255,0.15);
}

/* =====================================================
   Reference Info
   ===================================================== */
.reference-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
    padding: 8px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-button);
    font-size: 13px;
}

.ref-item {
    color: var(--text-secondary);
}

.ref-item strong {
    color: var(--text-primary);
}

/* =====================================================
   Walker Rank Section
   ===================================================== */
.walker-rank {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    margin-bottom: 8px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-section);
    box-shadow: var(--shadow-sm);
}

.rank-icon {
    font-size: 2.5em;
    flex-shrink: 0;
}

.rank-info {
    flex: 1;
}

.rank-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2px;
}

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

/* Rank color variants - Light mode */
.walker-rank.bronze { background: linear-gradient(135deg, #fef3c7, #fde68a); border-color: #cd7f32; }
.walker-rank.silver { background: linear-gradient(135deg, #f1f5f9, #e2e8f0); border-color: #94a3b8; }
.walker-rank.gold { background: linear-gradient(135deg, #fef3c7, #fcd34d); border-color: #f59e0b; }
.walker-rank.platinum { background: linear-gradient(135deg, #e0f2fe, #bae6fd); border-color: #0ea5e9; }
.walker-rank.diamond { background: linear-gradient(135deg, #e9d5ff, #d8b4fe); border-color: #a855f7; }
.walker-rank.legend { background: linear-gradient(135deg, #fce7f3, #fbcfe8); border-color: #ec4899; }

/* Rank color variants - Dark mode */
.steps-life-calculator-container.dark .walker-rank.bronze { background: linear-gradient(135deg, #5c4a2a, #4a3d22); border-color: #cd7f32; }
.steps-life-calculator-container.dark .walker-rank.silver { background: linear-gradient(135deg, #4a4a4a, #3d3d3d); border-color: #94a3b8; }
.steps-life-calculator-container.dark .walker-rank.gold { background: linear-gradient(135deg, #5c4a1a, #4a3d15); border-color: #f59e0b; }
.steps-life-calculator-container.dark .walker-rank.platinum { background: linear-gradient(135deg, #1a3a4a, #153040); border-color: #0ea5e9; }
.steps-life-calculator-container.dark .walker-rank.diamond { background: linear-gradient(135deg, #3a2a4a, #302040); border-color: #a855f7; }
.steps-life-calculator-container.dark .walker-rank.legend { background: linear-gradient(135deg, #4a2a3a, #402030); border-color: #ec4899; }

/* Rank text colors - Dark mode */
.steps-life-calculator-container.dark .walker-rank .rank-title,
.steps-life-calculator-container.dark .walker-rank .rank-message {
    color: #e8e8e8;
}

/* System dark mode auto detection for ranks */
@media (prefers-color-scheme: dark) {
    .steps-life-calculator-container:not(.dark):not(.light) .walker-rank.bronze { background: linear-gradient(135deg, #5c4a2a, #4a3d22); border-color: #cd7f32; }
    .steps-life-calculator-container:not(.dark):not(.light) .walker-rank.silver { background: linear-gradient(135deg, #4a4a4a, #3d3d3d); border-color: #94a3b8; }
    .steps-life-calculator-container:not(.dark):not(.light) .walker-rank.gold { background: linear-gradient(135deg, #5c4a1a, #4a3d15); border-color: #f59e0b; }
    .steps-life-calculator-container:not(.dark):not(.light) .walker-rank.platinum { background: linear-gradient(135deg, #1a3a4a, #153040); border-color: #0ea5e9; }
    .steps-life-calculator-container:not(.dark):not(.light) .walker-rank.diamond { background: linear-gradient(135deg, #3a2a4a, #302040); border-color: #a855f7; }
    .steps-life-calculator-container:not(.dark):not(.light) .walker-rank.legend { background: linear-gradient(135deg, #4a2a3a, #402030); border-color: #ec4899; }
    .steps-life-calculator-container:not(.dark):not(.light) .walker-rank .rank-title,
    .steps-life-calculator-container:not(.dark):not(.light) .walker-rank .rank-message {
        color: #e8e8e8;
    }
}

/* =====================================================
   Primary Stats
   ===================================================== */
.primary-stats {
    margin-bottom: 8px;
}

.stat-item {
    padding: 8px;
    margin-bottom: 6px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-button);
    box-shadow: var(--shadow-sm);
}

.stat-item:last-child {
    margin-bottom: 0;
}

.stat-item.primary {
    text-align: center;
    padding: 12px;
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
}

.stat-label {
    display: block;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 2px;
}

.stat-value {
    display: block;
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
}

.stat-value.highlight {
    font-size: 26px;
    color: var(--color-accent);
}

.stat-row-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    margin-bottom: 6px;
}

.stat-row-2 .stat-item {
    margin-bottom: 0;
}

.stat-item.earth {
    background: linear-gradient(135deg, #ecfdf5, #d1fae5);
    border-color: var(--color-success);
}

.stat-item.earth .stat-value {
    color: var(--color-success);
}

.stat-item.moon {
    background: linear-gradient(135deg, #f3e8ff, #e9d5ff);
    border-color: var(--color-purple);
}

.stat-item.moon .stat-value {
    color: var(--color-purple);
}

/* Dark mode for earth and moon stat items */
.steps-life-calculator-container.dark .stat-item.earth {
    background: linear-gradient(135deg, #1a3a2a, #152f22);
}

.steps-life-calculator-container.dark .stat-item.moon {
    background: linear-gradient(135deg, #2a1a3a, #221530);
}

.steps-life-calculator-container.dark .stat-item.earth .stat-label,
.steps-life-calculator-container.dark .stat-item.moon .stat-label {
    color: #b0b0b0;
}

/* System dark mode auto detection for earth/moon */
@media (prefers-color-scheme: dark) {
    .steps-life-calculator-container:not(.dark):not(.light) .stat-item.earth {
        background: linear-gradient(135deg, #1a3a2a, #152f22);
    }
    .steps-life-calculator-container:not(.dark):not(.light) .stat-item.moon {
        background: linear-gradient(135deg, #2a1a3a, #221530);
    }
    .steps-life-calculator-container:not(.dark):not(.light) .stat-item.earth .stat-label,
    .steps-life-calculator-container:not(.dark):not(.light) .stat-item.moon .stat-label {
        color: #b0b0b0;
    }
}

/* =====================================================
   Subsection Title
   ===================================================== */
.subsection-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
    padding-bottom: 4px;
    border-bottom: 1px dashed var(--border-color);
}

/* =====================================================
   Fun Stats Grid
   ===================================================== */
.fun-stats-section {
    margin-bottom: 8px;
}

.fun-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
}

.fun-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-button);
    transition: all 0.2s;
}

.fun-item:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.fun-icon {
    font-size: 1.4em;
    flex-shrink: 0;
}

.fun-content {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.fun-label {
    font-size: 13px;
    color: var(--text-light);
    font-weight: 500;
}

.fun-value {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-accent);
    font-family: 'Courier New', monospace;
}

/* =====================================================
   Future Prediction
   ===================================================== */
.future-prediction {
    margin-bottom: 8px;
    padding: 8px;
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border: 1px solid #f59e0b;
    border-radius: var(--radius-section);
}

.steps-life-calculator-container.dark .future-prediction {
    background: linear-gradient(135deg, #4a3f2a, #3d3424);
    border-color: #f5b041;
}

.prediction-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
}

.prediction-item {
    padding: 8px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: var(--radius-button);
    text-align: center;
}

.steps-life-calculator-container.dark .prediction-item {
    background: rgba(0, 0, 0, 0.3);
}

.prediction-label {
    display: block;
    font-size: 13px;
    color: #78350f;
    font-weight: 500;
    margin-bottom: 2px;
}

.steps-life-calculator-container.dark .prediction-label {
    color: #fcd34d;
}

.prediction-value {
    font-size: 18px;
    font-weight: 700;
    color: #92400e;
    font-family: 'Courier New', monospace;
}

.steps-life-calculator-container.dark .prediction-value {
    color: #f5b041;
}

/* System dark mode for future prediction */
@media (prefers-color-scheme: dark) {
    .steps-life-calculator-container:not(.dark):not(.light) .future-prediction {
        background: linear-gradient(135deg, #4a3f2a, #3d3424);
        border-color: #f5b041;
    }
    .steps-life-calculator-container:not(.dark):not(.light) .prediction-item {
        background: rgba(0, 0, 0, 0.3);
    }
    .steps-life-calculator-container:not(.dark):not(.light) .prediction-label {
        color: #fcd34d;
    }
    .steps-life-calculator-container:not(.dark):not(.light) .prediction-value {
        color: #f5b041;
    }
}

/* =====================================================
   Achievements Section
   ===================================================== */
.achievements-section {
    margin-bottom: 8px;
    display: none;
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    gap: 6px;
}

.achievement-badge {
    padding: 8px 4px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-button);
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.achievement-badge:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.achievement-badge.unlocked {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border-color: #fbbf24;
}

/* Dark mode for unlocked achievement badges */
.steps-life-calculator-container.dark .achievement-badge.unlocked {
    background: linear-gradient(135deg, #5c4a2a, #4a3d22);
    border-color: #fbbf24;
}

.achievement-icon {
    font-size: 1.8em;
    margin-bottom: 2px;
    filter: grayscale(100%);
    opacity: 0.5;
}

.achievement-badge.unlocked .achievement-icon {
    filter: grayscale(0%);
    opacity: 1;
}

.achievement-name {
    font-size: 11px;
    color: var(--text-light);
    font-weight: 500;
}

.achievement-badge.unlocked .achievement-name {
    color: var(--text-primary);
    font-weight: 600;
}

/* System dark mode for achievement badges */
@media (prefers-color-scheme: dark) {
    .steps-life-calculator-container:not(.dark):not(.light) .achievement-badge.unlocked {
        background: linear-gradient(135deg, #5c4a2a, #4a3d22);
        border-color: #fbbf24;
    }
}

/* =====================================================
   Comparison Section
   ===================================================== */
.comparison-section {
    margin-bottom: 8px;
}

.comparison-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 150px;
    overflow-y: auto;
    padding-right: 4px;
}

.comparison-list::-webkit-scrollbar {
    width: 5px;
}

.comparison-list::-webkit-scrollbar-track {
    background: var(--bg-primary);
    border-radius: 3px;
}

.comparison-list::-webkit-scrollbar-thumb {
    background: var(--text-light);
    border-radius: 3px;
}

.comparison-placeholder {
    text-align: center;
    padding: 16px;
    color: var(--text-light);
    font-size: 14px;
}

.comparison-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 10px;
    background: var(--bg-primary);
    border-radius: var(--radius-button);
    border-left: 3px solid var(--color-accent);
    font-size: 14px;
    transition: all 0.2s;
}

.comparison-item:hover {
    background: var(--bg-secondary);
}

.comparison-route {
    font-weight: 500;
    color: var(--text-primary);
}

.comparison-times {
    font-weight: 700;
    color: var(--color-accent);
    font-family: 'Courier New', monospace;
}

/* =====================================================
   Chart Container
   ===================================================== */
.chart-container {
    height: 160px;
    margin-bottom: 8px;
    padding: 8px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-button);
}

/* =====================================================
   Share Buttons
   ===================================================== */
.share-buttons {
    display: flex;
    gap: 6px;
}

.share-btn,
.copy-btn {
    flex: 1;
    padding: 8px 12px;
    font-size: 15px;
    font-weight: 500;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-button);
    cursor: pointer;
    transition: all 0.15s;
    box-shadow: 2px 2px 0 rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.share-btn {
    background: var(--color-success);
    color: #fff;
}

.copy-btn {
    background: var(--copy-btn-bg);
    color: var(--text-primary);
}

.copy-btn svg {
    stroke: var(--text-primary);
}

.share-btn:hover,
.copy-btn:hover {
    transform: translate(0.5px, 0.5px);
    box-shadow: 1.5px 1.5px 0 rgba(0,0,0,0.15);
}

.share-btn:active,
.copy-btn:active {
    transform: translate(2px, 2px);
    box-shadow: none;
}

.copy-btn:hover {
    background: var(--copy-btn-hover-bg);
}

/* Dark mode shadow adjustment for share buttons */
.steps-life-calculator-container.dark .share-btn,
.steps-life-calculator-container.dark .copy-btn {
    box-shadow: 2px 2px 0 rgba(255,255,255,0.1);
}

.steps-life-calculator-container.dark .share-btn:hover,
.steps-life-calculator-container.dark .copy-btn:hover {
    box-shadow: 1.5px 1.5px 0 rgba(255,255,255,0.1);
}

/* =====================================================
   Toast Notification
   ===================================================== */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 10px 16px;
    background: var(--text-primary);
    color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-button);
    font-size: 16px;
    font-weight: 500;
    box-shadow: 4px 4px 0 rgba(0,0,0,0.3);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
}

.toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(-5px);
}

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

.toast.error {
    background: var(--color-danger);
    color: #fff;
}

.toast.info {
    background: var(--color-accent);
    color: #fff;
}

/* =====================================================
   Responsive - Tablet (768px)
   ===================================================== */
@media (max-width: 768px) {
    .steps-life-calculator-container {
        margin: 6px 5px;
        padding: 7px;
        width: calc(100% - 10px);
    }
    
    .main-grid {
        grid-template-columns: 1fr;
        gap: 6px;
    }
    
    .main-title {
        font-size: 24px;
    }
    
    .section-header {
        font-size: 16px;
    }
    
    .input-group label {
        font-size: 15.5px;
    }
    
    .calculate-btn {
        font-size: 17px;
    }
    
    .input-row {
        grid-template-columns: 1fr 1fr;
    }
    
    .stat-value {
        font-size: 20px;
    }
    
    .stat-value.highlight {
        font-size: 24px;
    }
}

/* =====================================================
   Responsive - Mobile (480px)
   ===================================================== */
@media (max-width: 480px) {
    .steps-life-calculator-container {
        margin: 5px 3px;
        padding: 6px;
        border-width: 1px;
    }
    
    .main-grid {
        gap: 5px;
    }
    
    .input-section,
    .result-section {
        padding: 6px;
        border-width: 1px;
    }
    
    .main-title {
        font-size: 22px;
    }
    
    .section-header {
        font-size: 15.5px;
    }
    
    .input-row {
        grid-template-columns: 1fr;
        gap: 6px;
    }
    
    .input-group label {
        font-size: 15px;
    }
    
    .calculate-btn {
        padding: 7px 14px;
        font-size: 16.5px;
    }
    
    .stat-row-2 {
        grid-template-columns: 1fr;
    }
    
    .fun-grid {
        grid-template-columns: 1fr;
    }
    
    .prediction-row {
        grid-template-columns: 1fr;
    }
    
    .reference-info {
        grid-template-columns: 1fr;
    }
    
    .share-buttons {
        flex-direction: column;
    }
    
    .preset-buttons {
        flex-direction: column;
    }
}