:root {
    --primary-color: #0f172a;
    --primary-hover: #1e293b;
    --bg-main: #e2e8f0;
    --bg-card: #ffffff;
    --text-main: #0f172a;
    --text-secondary: #334155;
    --text-hint: #64748b;
    --border-color: #cbd5e1;
    --border-focus: #94a3b8;
    --border-radius: 12px;
    --radius-sm: 8px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --error-bg: #fef2f2;
    --error-text: #b91c1c;
    --error-border: #f87171;
    --warning-bg: #fffbeb;
    --warning-text: #b45309;
    --warning-border: #fbbf24;
    --success-bg: #f0fdf4;
    --success-color: #16a34a;
    --success-border: #bbf7d0;
    --transition: all 0.2s ease-in-out;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.layout {
    display: flex;
    flex-direction: column;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    gap: 32px;
}

@media (min-width: 992px) {
    .layout {
        flex-direction: row;
        align-items: flex-start;
        padding: 40px var(--spacing-lg);
    }
    
    .main-content {
        flex: 1 1 0;
        min-width: 0;
    }
    
    .sidebar {
        width: 340px;
        flex-shrink: 0;
        position: sticky;
        top: 40px;
    }
}

.header {
    margin-bottom: 32px;
}

.header h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.header p {
    color: var(--text-secondary);
    font-size: 16px;
    max-width: 700px;
}

.identity-card {
    margin-bottom: 24px;
}

.identity-card-body {
    padding: 22px var(--spacing-lg) 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.identity-card-copy h2 {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 6px;
}

.identity-card-copy p {
    color: var(--text-secondary);
    font-size: 15px;
    max-width: 720px;
}

.identity-row {
    margin-bottom: 0;
}

.products-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-bottom: 24px;
}

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    overflow: hidden;
    transition: var(--transition);
}

.card:focus-within {
    border-color: var(--border-focus);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
}

.card-header {
    padding: 20px var(--spacing-lg) 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: #fafbfc;
}

.input-title {
    font-size: 20px;
    font-weight: 500;
    font-family: inherit;
    color: var(--text-main);
    border: none;
    background: transparent;
    width: 100%;
    outline: none;
}
.input-title::placeholder {
    color: #94a3b8;
    font-weight: 400;
}

.btn-icon {
    background: transparent;
    border: none;
    color: #94a3b8;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    line-height: 0;
    transition: var(--transition);
}

.btn-icon:hover {
    color: var(--error-text);
    background-color: var(--error-bg);
}

.card-body {
    padding: 24px var(--spacing-lg);
}

.form-row {
    margin-bottom: 24px;
}

.split-row {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

@media (min-width: 640px) {
    .split-row {
        flex-direction: row;
        gap: 24px;
    }
    .split-row .form-group {
        flex: 1;
    }
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.period-group {
    min-width: 0;
}

.period-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
}

.period-note-card {
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: #f8fafc;
    align-self: start;
}

.period-note-copy {
    min-width: 0;
}

.period-note-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-main);
    line-height: 1.35;
    margin-bottom: 6px;
}

.period-note-text {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.45;
}

@media (min-width: 780px) {
    .period-layout {
        grid-template-columns: minmax(0, 1fr) 250px;
        align-items: start;
    }
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.input-field {
    font-family: inherit;
    font-size: 16px;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    outline: none;
    transition: var(--transition);
    color: var(--text-main);
    background-color: #fff;
    width: 100%;
}

.input-field:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.input-field::placeholder {
    color: #cbd5e1;
}

.identity-input {
    background-color: #fcfdff;
}

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

.input-with-currency .input-field {
    padding-right: 36px;
}

.input-with-currency .currency {
    position: absolute;
    right: 12px;
    color: var(--text-hint);
    pointer-events: none;
    font-weight: 500;
}

.hint {
    font-size: 13px;
    color: var(--text-hint);
    line-height: 1.4;
}

.mode-section {
    background-color: #f8fafc;
    border-radius: var(--radius-sm);
    padding: 20px;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
}

.mode-switcher {
    display: inline-flex;
    background-color: #e2e8f0;
    padding: 4px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
}

.mode-btn {
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    padding: 6px 16px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
}

.mode-btn.active {
    background-color: #fff;
    color: var(--primary-color);
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.mode-content {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.mode-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Calculate Mode Specifics */
.calc-intro {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.5;
}

.calc-intro .strong-logic {
    font-weight: 600;
    color: var(--text-main);
    margin-top: 4px;
}

.step-by-step-calc {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 20px;
    border-left: 2px solid var(--border-color);
    padding-left: 16px;
}

.stop-signal {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background-color: var(--warning-bg);
    border: 1px solid var(--warning-border);
    border-radius: var(--radius-sm);
    color: var(--warning-text);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 24px;
}
.stop-signal svg {
    flex-shrink: 0;
}

.calc-result-box {
    padding: 20px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background-color: #fff;
    transition: var(--transition);
}

.result-header {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.result-message { display: none; }

/* States of the result box */
.calc-result-box.state-empty {
    background-color: #f1f5f9;
    border-style: dashed;
}
.calc-result-box.state-empty .result-empty {
    display: block;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
}

.calc-result-box.state-error {
    background-color: var(--error-bg);
    border-color: var(--error-border);
}
.calc-result-box.state-error .result-error {
    display: block;
    color: var(--error-text);
    font-size: 15px;
    font-weight: 500;
}

.calc-result-box.state-success {
    background-color: var(--success-bg);
    border-color: var(--success-border);
}
.calc-result-box.state-success .result-success {
    display: block;
    font-size: 28px;
    font-weight: 600;
    color: var(--success-color);
    letter-spacing: -0.02em;
}

.result-hint {
    margin-top: 8px;
    font-size: 13px;
    color: var(--text-hint);
    line-height: 1.4;
}

.divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 32px 0 24px;
}

.cpa-intro {
    margin-bottom: 20px;
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: #f8fafc;
}

.cpa-intro-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 6px;
}

.cpa-intro-text {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.45;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px var(--spacing-lg);
    background-color: rgba(0, 0, 0, 0.02);
    border-top: 1px solid var(--border-color);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
}
.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: #cbd5e1;
}

.status-ready .status-dot { background-color: var(--success-color); }
.status-ready .status-text { color: var(--success-color); }
.status-error .status-dot { background-color: var(--error-text); }
.status-error .status-text { color: var(--error-text); }
.status-incomplete .status-text { color: var(--text-secondary); }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
}
.btn-secondary {
    background-color: #ffffff;
    border-color: var(--border-color);
    color: var(--text-main);
}
.btn-secondary:hover {
    background-color: #f1f5f9;
    border-color: #cbd5e1;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #ffffff;
    border-color: var(--primary-color);
}
.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
}
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: var(--border-color);
    border-color: var(--border-color);
    color: var(--text-secondary);
}

.btn.btn-sent:disabled {
    opacity: 1;
    cursor: default;
    background-color: var(--success-color);
    border-color: var(--success-color);
    color: #ffffff;
}
.w-100 {
    width: 100%;
}

.add-card-btn {
    width: 100%;
    border-style: dashed;
    border-width: 2px;
    color: var(--primary-color);
    padding: 16px;
    background-color: transparent;
}
.add-card-btn:hover {
    background-color: #eff6ff;
    border-color: #bfdbfe;
}

.sidebar-block {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.sidebar-block h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-main);
}
.rules-list {
    list-style: none;
    font-size: 14px;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.rules-list li {
    position: relative;
    padding-left: 16px;
}
.rules-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--primary-color);
}
.summary-item {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}
.summary-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}
.summary-title-wrapper {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 4px;
}
.summary-title-text {
    font-weight: 500;
    font-size: 14px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
}
.summary-stats {
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.empty-text {
    font-size: 14px;
    color: var(--text-hint);
    font-style: italic;
}

.summary-actions {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px dashed var(--border-color);
}

.submit-hint {
    margin-top: 10px;
    font-size: 13px;
    line-height: 1.45;
    color: var(--text-hint);
}

.submit-hint.is-error {
    color: var(--error-text);
}

.submit-hint.is-success {
    color: var(--success-color);
}

.badge {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    flex-shrink: 0;
    vertical-align: middle;
}
.badge-draft {
    background-color: var(--warning-bg);
    color: var(--warning-text);
    border: 1px solid var(--warning-border);
}
.badge-saved {
    background-color: var(--success-bg);
    color: var(--success-color);
    border: 1px solid var(--success-border);
}