/* Custom Properties for Warm Dark Mode */
:root {
    --bg-base: #1a1918;
    --bg-surface: #262423;
    --bg-surface-hover: #302d2c;
    --border-color: #3d3936;
    --text-main: #e6e2dd;
    --text-muted: #a39f99;
    --accent-color: #d97736;
    --accent-hover: #ed8847;
    --success-color: #5a9e5a;
    --error-color: #c95c5c;
    
    --font-sans: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'Courier New', Courier, monospace;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-base);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.app-header {
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
}

.app-header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-color);
    letter-spacing: 0.5px;
}

.app-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Ad Spaces */
.ad-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px dashed var(--border-color);
    color: var(--text-muted);
    background-color: var(--bg-surface);
    margin: 20px auto;
    font-size: 0.9rem;
    text-align: center;
}

.desktop-ad {
    width: 728px;
    height: 90px;
    display: none;
}

.mobile-ad {
    width: 320px;
    height: 50px;
    display: flex;
}

/* Main Grid Layout */
.main-content {
    padding: 30px 20px;
}

.app-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

/* Panels */
.input-panel, .results-panel {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
}

h2 {
    font-size: 1.4rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

.mt-4 {
    margin-top: 30px;
}

.text-muted {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

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

label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.95rem;
    font-weight: 500;
}

input[type="number"], select {
    width: 100%;
    padding: 12px;
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: border-color 0.2s ease;
}

input[type="number"]:focus, select:focus {
    outline: none;
    border-color: var(--accent-color);
}

.btn-primary {
    width: 100%;
    padding: 14px;
    background-color: var(--accent-color);
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
}

/* Results Styles */
.summary-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

.summary-card {
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    padding: 15px;
    border-radius: 6px;
    display: flex;
    flex-direction: column;
}

.summary-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 5px;
}

.summary-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

.padding-advice {
    background-color: rgba(217, 119, 54, 0.1);
    border-left: 4px solid var(--accent-color);
    padding: 15px;
    border-radius: 4px;
    font-size: 0.95rem;
    margin-bottom: 20px;
}

/* Sequence List */
.sequence-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.empty-state {
    text-align: center;
    padding: 30px;
    background-color: var(--bg-base);
    border: 1px dashed var(--border-color);
    border-radius: 6px;
    color: var(--text-muted);
}

.signature-card {
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 15px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.signature-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.signature-title {
    font-weight: 600;
    font-size: 1.1rem;
}

.signature-pages {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.sequence-display {
    background-color: #111;
    border: 1px solid var(--border-color);
    padding: 10px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    word-break: break-all;
    max-height: 80px;
    overflow-y: auto;
}

.btn-copy {
    background-color: var(--bg-surface);
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-copy:hover {
    background-color: var(--accent-color);
    color: #fff;
}

.btn-copy.copied {
    background-color: var(--success-color);
    border-color: var(--success-color);
    color: #fff;
}

/* Footer */
.app-footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 20px;
    border-top: 1px solid var(--border-color);
}

/* Media Queries for Desktop */
@media (min-width: 768px) {
    .app-grid {
        grid-template-columns: 350px 1fr;
    }
    
    .desktop-ad {
        display: flex;
    }
    
    .mobile-ad {
        display: none;
    }
    
    .signature-card {
        flex-direction: row;
        align-items: center;
    }
    
    .signature-info {
        flex: 1;
    }
    
    .signature-header {
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: 10px;
    }
    
    .btn-copy {
        margin-left: 15px;
        flex-shrink: 0;
        width: 120px;
        height: 40px;
    }
}

@media (min-width: 1024px) {
    .app-grid {
        grid-template-columns: 400px 1fr;
    }
}