/* ===== CSS Variables & Design Tokens ===== */
:root {
    /* Color Palette */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;

    /* Neutral Colors */
    --bg-primary: #0f0f1e;
    --bg-secondary: #1a1a2e;
    --bg-card: #16213e;
    --bg-card-hover: #1f2b4a;
    --bg-input: #0f1729;

    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --text-muted: #718096;
    --text-accent: #667eea;

    /* Status Colors */
    --success-color: #48bb78;
    --success-bg: rgba(72, 187, 120, 0.1);
    --warning-color: #ed8936;
    --warning-bg: rgba(237, 137, 54, 0.1);
    --error-color: #f56565;
    --error-bg: rgba(245, 101, 101, 0.1);
    --info-color: #4299e1;
    --info-bg: rgba(66, 153, 225, 0.1);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
}

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

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Animated Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.1) 0%, transparent 50%);
    z-index: -1;
    animation: backgroundPulse 10s ease-in-out infinite;
}

@keyframes backgroundPulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.8;
    }
}

/* ===== Layout ===== */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* ===== Header ===== */
.header {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg) var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-5px);
    }
}

.logo-text h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.25rem;
}

.logo-text p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* ===== Buttons ===== */
.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    outline: none;
    font-family: var(--font-family);
}

.btn-primary {
    background: var(--primary-gradient);
    color: var(--text-primary);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--bg-input);
    color: var(--text-secondary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
    border-color: var(--primary-color);
}

/* ===== Main Content ===== */
.main-content {
    margin-bottom: var(--spacing-2xl);
}

/* ===== Section Title ===== */
.section-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

/* ===== Scenario Section ===== */
.scenario-section {
    margin-bottom: var(--spacing-2xl);
}

.scenario-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.scenario-card {
    background: var(--bg-card);
    border: 2px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.scenario-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: 0;
}

.scenario-card:hover::before {
    opacity: 0.05;
}

.scenario-card.active {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-glow);
}

.scenario-card.active::before {
    opacity: 0.1;
}

.scenario-card>* {
    position: relative;
    z-index: 1;
}

.scenario-icon {
    width: 64px;
    height: 64px;
    background: var(--primary-gradient);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    transition: transform var(--transition-base);
}

.scenario-card:hover .scenario-icon {
    transform: scale(1.1) rotate(5deg);
}

.scenario-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.scenario-desc {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.scenario-detail {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

.scenario-badge {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    background: var(--bg-input);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-base);
}

.scenario-card.active .scenario-badge {
    background: var(--primary-gradient);
    color: var(--text-primary);
}

/* ===== Calculator Grid ===== */
.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
}

/* ===== Form Styles ===== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.required {
    color: var(--error-color);
    margin-left: 0.25rem;
}

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

.form-input {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--bg-input);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    transition: all var(--transition-base);
    outline: none;
}

.form-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-input:invalid:not(:placeholder-shown) {
    border-color: var(--error-color);
}

.input-suffix {
    position: absolute;
    right: 1rem;
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    pointer-events: none;
}

.input-hint {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

/* ===== Advanced Settings ===== */
.advanced-settings {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.advanced-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--bg-input);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    gap: var(--spacing-sm);
}

.advanced-toggle:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.advanced-toggle .chevron {
    transition: transform var(--transition-base);
}

.advanced-toggle.active .chevron {
    transform: rotate(180deg);
}

.advanced-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.advanced-content.expanded {
    max-height: 500px;
    margin-top: var(--spacing-md);
}

/* ===== Form Actions ===== */
.form-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.form-actions button {
    flex: 1;
}

/* ===== Result Section ===== */
.result-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    text-align: center;
    color: var(--text-muted);
}

.result-placeholder svg {
    margin-bottom: var(--spacing-lg);
    opacity: 0.3;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 0.3;
    }

    50% {
        opacity: 0.5;
    }
}

.result-content {
    animation: fadeIn var(--transition-slow);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hidden {
    display: none !important;
}

/* ===== CMR Highlight ===== */
.cmr-highlight {
    background: var(--primary-gradient);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-glow);
    animation: slideDown var(--transition-slow);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.cmr-label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
    opacity: 0.9;
}

.cmr-value {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    animation: countUp 1s ease-out;
}

@keyframes countUp {
    from {
        opacity: 0;
        transform: scale(0.5);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.profit-amount {
    font-size: var(--font-size-lg);
    opacity: 0.9;
}

/* ===== Calculation Details ===== */
.calculation-details {
    margin-bottom: var(--spacing-xl);
}

.details-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.details-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.detail-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-input);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary-color);
    transition: all var(--transition-base);
    animation: slideIn var(--transition-base) backwards;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.detail-item:nth-child(1) {
    animation-delay: 0.05s;
}

.detail-item:nth-child(2) {
    animation-delay: 0.1s;
}

.detail-item:nth-child(3) {
    animation-delay: 0.15s;
}

.detail-item:nth-child(4) {
    animation-delay: 0.2s;
}

.detail-item:nth-child(5) {
    animation-delay: 0.25s;
}

.detail-item:nth-child(6) {
    animation-delay: 0.3s;
}

.detail-item:hover {
    background: var(--bg-card-hover);
    transform: translateX(5px);
}

.detail-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.detail-value {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
}

.detail-formula {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ===== Distribution Section ===== */
.distribution-section {
    margin-bottom: var(--spacing-xl);
}

.distribution-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.distribution-card {
    background: var(--bg-input);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    border: 2px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition-base);
    animation: scaleIn var(--transition-base) backwards;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.distribution-card:nth-child(1) {
    animation-delay: 0.1s;
}

.distribution-card:nth-child(2) {
    animation-delay: 0.2s;
}

.distribution-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.distribution-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.distribution-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== Result Actions ===== */
.result-actions {
    display: flex;
    gap: var(--spacing-md);
}

.result-actions button {
    flex: 1;
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-sm);
    }

    .header {
        padding: var(--spacing-md);
    }

    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .logo-text h1 {
        font-size: var(--font-size-xl);
    }

    .scenario-cards {
        grid-template-columns: 1fr;
    }

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

    .form-actions,
    .result-actions {
        flex-direction: column;
    }

    .cmr-value {
        font-size: var(--font-size-3xl);
    }

    .distribution-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .logo-text h1 {
        font-size: var(--font-size-lg);
    }

    .section-title {
        font-size: var(--font-size-lg);
    }

    .cmr-value {
        font-size: var(--font-size-2xl);
    }
}

/* ===== Utility Classes ===== */
.text-center {
    text-align: center;
}

.mt-1 {
    margin-top: var(--spacing-xs);
}

.mt-2 {
    margin-top: var(--spacing-sm);
}

.mt-3 {
    margin-top: var(--spacing-md);
}

.mt-4 {
    margin-top: var(--spacing-lg);
}

.mb-1 {
    margin-bottom: var(--spacing-xs);
}

.mb-2 {
    margin-bottom: var(--spacing-sm);
}

.mb-3 {
    margin-bottom: var(--spacing-md);
}

.mb-4 {
    margin-bottom: var(--spacing-lg);
}

/* ===== Collapsible Sections ===== */
.section-header-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    margin-bottom: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
    user-select: none;
}

.section-header-toggle .details-title {
    margin-bottom: 0;
}

.section-header-toggle .chevron {
    transition: transform var(--transition-base);
    color: var(--text-muted);
}

.section-header-toggle:hover .chevron {
    color: var(--primary-color);
}

.section-header-toggle.collapsed .chevron {
    transform: rotate(-90deg);
}

.details-list {
    transition: all var(--transition-base);
    transform-origin: top;
}

.details-list.collapsed {
    display: none;
}