:root {
    /* Bitcoin-themed light colors */
    --bg-primary: #fef7f0;
    --bg-secondary: #ffffff;
    --bg-tertiary: #fff8f0;
    --text-primary: #2c1810;
    --text-secondary: #8b5a2b;
    --text-muted: #a67c52;
    --border-color: #f4d1a7;
    --border-light: #e6c299;
    --shadow: rgba(255, 140, 0, 0.1);
    --shadow-light: rgba(255, 140, 0, 0.05);
    --success-bg: #e8f5e8;
    --success-border: #28a745;
    --success-text: #155724;
    --info-bg: #fff4e6;
    --info-border: #ff8c00;
    --warning-bg: #fff3cd;
    --warning-border: #ffc107;
    --error-bg: #f8d7da;
    --error-border: #dc3545;
    --bitcoin-orange: #c2410c;
    --bitcoin-orange-light: #ea580c;
    --bitcoin-orange-dark: #9a3412;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        /* Bitcoin-themed dark colors */
        --bg-primary: #1a0f0a;
        --bg-secondary: #2d1b0f;
        --bg-tertiary: #3a2414;
        --text-primary: #fff4e6;
        --text-secondary: #e6c299;
        --text-muted: #cc9a66;
        --border-color: #4d3319;
        --border-light: #664422;
        --shadow: rgba(255, 140, 0, 0.2);
        --shadow-light: rgba(255, 140, 0, 0.1);
        --success-bg: #1e4d2b;
        --success-border: #28a745;
        --success-text: #90ee90;
        --info-bg: #2d1b0f;
        --info-border: #f7931a;
        --warning-bg: #4d3a1a;
        --warning-border: #ffc107;
        --error-bg: #4d1a1a;
        --error-border: #dc3545;
        --bitcoin-orange: #f7931a;
        --bitcoin-orange-light: #ffb84d;
        --bitcoin-orange-dark: #e6820a;
    }
}

/* Manual theme overrides */
[data-theme="dark"] {
    --bg-primary: #1a0f0a;
    --bg-secondary: #2d1b0f;
    --bg-tertiary: #3a2414;
    --text-primary: #fff4e6;
    --text-secondary: #e6c299;
    --text-muted: #cc9a66;
    --border-color: #4d3319;
    --border-light: #664422;
    --shadow: rgba(255, 140, 0, 0.2);
    --shadow-light: rgba(255, 140, 0, 0.1);
    --success-bg: #1e4d2b;
    --success-border: #28a745;
    --success-text: #90ee90;
    --info-bg: #2d1b0f;
    --info-border: #f7931a;
    --warning-bg: #4d3a1a;
    --warning-border: #ffc107;
    --error-bg: #4d1a1a;
    --error-border: #dc3545;
    --bitcoin-orange: #c2410c;
    --bitcoin-orange-light: #ea580c;
    --bitcoin-orange-dark: #9a3412;
}

[data-theme="light"] {
    --bg-primary: #fef7f0;
    --bg-secondary: #ffffff;
    --bg-tertiary: #fff8f0;
    --text-primary: #2c1810;
    --text-secondary: #8b5a2b;
    --text-muted: #a67c52;
    --border-color: #f4d1a7;
    --border-light: #e6c299;
    --shadow: rgba(255, 140, 0, 0.1);
    --shadow-light: rgba(255, 140, 0, 0.05);
    --success-bg: #e8f5e8;
    --success-border: #28a745;
    --success-text: #155724;
    --info-bg: #fff4e6;
    --info-border: #ff8c00;
    --warning-bg: #fff3cd;
    --warning-border: #ffc107;
    --error-bg: #f8d7da;
    --error-border: #dc3545;
    --bitcoin-orange: #c2410c;
    --bitcoin-orange-light: #ea580c;
    --bitcoin-orange-dark: #9a3412;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    background: var(--bg-secondary);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 2px 10px var(--shadow);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.header-section {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

h1 {
    color: var(--text-primary);
    margin: 0;
    flex: 1;
    text-align: center;
    transition: color 0.3s ease;
}

.home-btn {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px var(--shadow-light);
}

.home-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--bitcoin-orange);
    color: var(--bitcoin-orange);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--success-border);
    color: white;
    padding: 12px 20px;
    border-radius: 5px;
    box-shadow: 0 2px 10px var(--shadow);
    z-index: 1000;
    opacity: 0;
    transform: translateX(100%);
    transition: all 0.3s ease;
}

.notification.show {
    opacity: 1;
    transform: translateX(0);
}

/* Common button styles */
.btn {
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--bitcoin-orange) 0%, var(--bitcoin-orange-dark) 100%);
    color: white;
    font-weight: 700;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(194, 65, 12, 0.3);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    box-shadow: 0 2px 4px var(--shadow-light);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--bitcoin-orange);
    color: var(--bitcoin-orange);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.btn-success {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white;
}

.btn-success:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.3);
}

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

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
    background: var(--bg-secondary);
    color: var(--text-primary);
    box-sizing: border-box;
}

.form-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Text styles */
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }

/* Background styles */
.bg-primary { background-color: var(--bg-primary); }
.bg-secondary { background-color: var(--bg-secondary); }
.bg-tertiary { background-color: var(--bg-tertiary); }

/* Border styles */
.border { border: 1px solid var(--border-color); }
.border-light { border: 1px solid var(--border-light); }

/* Footer styles */
.footer {
    margin-top: 40px;
    padding: 20px 0;
    text-align: center;
    border-top: 1px solid var(--border-light);
    transition: border-color 0.3s ease;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.footer-text {
    color: var(--text-muted);
    font-size: 14px;
    margin: 0;
    transition: color 0.3s ease;
}

.github-link, .feedback-link {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 15px;
    padding: 8px 12px;
    border-radius: 6px;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.github-link:hover, .feedback-link:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    text-decoration: none;
    transform: translateY(-1px);
}

.github-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.feedback-icon {
    font-size: 16px;
}