/* ========================================
   AI ROI Calculator - Premium Styles
   ======================================== */

/* CSS Variables */
:root {
    /* Brand Colors */
    --primary: #8B5CF6;
    --primary-light: #A78BFA;
    --primary-dark: #7C3AED;
    --primary-glow: rgba(139, 92, 246, 0.4);

    --secondary: #06B6D4;
    --secondary-light: #22D3EE;

    --success: #10B981;
    --success-light: #34D399;

    --warning: #F59E0B;
    --error: #EF4444;

    /* Background Colors */
    --bg-dark: #0F0F1A;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    --bg-input: rgba(255, 255, 255, 0.05);

    /* Text Colors */
    --text-primary: #FFFFFF;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);

    /* Borders */
    --border-color: rgba(255, 255, 255, 0.1);
    --border-focus: rgba(139, 92, 246, 0.5);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px var(--primary-glow);

    /* Font Families */
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
}

/* Base Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

    /* Gradient background */
    background-image:
        radial-gradient(ellipse at 20% 20%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(6, 182, 212, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(139, 92, 246, 0.05) 0%, transparent 70%);
    background-attachment: fixed;
}

/* Container */
.calculator-container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    animation: fadeIn 0.6s ease-out;
}

/* ========================================
   Header Styles
   ======================================== */

.header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    animation: slideUp 0.6s ease-out;
}

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

.logo-placeholder {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.logo img,
.logo-img {
    max-height: 48px;
    width: auto;
    filter: drop-shadow(0 0 10px rgba(139, 92, 246, 0.3));
}

.title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ========================================
   Progress Indicator
   ======================================== */

.progress-container {
    margin-bottom: var(--spacing-xl);
    animation: slideUp 0.6s ease-out 0.1s backwards;
}

.progress-bar {
    height: 4px;
    background: var(--bg-input);
    border-radius: 2px;
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 33.33%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: 2px;
    transition: width var(--transition-normal);
}

.progress-steps {
    display: flex;
    justify-content: space-between;
}

.step-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
    cursor: pointer;
    transition: opacity var(--transition-normal);
}

.step-indicator:not(.active):not(.completed) {
    opacity: 0.5;
}

.step-dot {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-input);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all var(--transition-normal);
}

.step-indicator.active .step-dot {
    background: var(--primary);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.step-indicator.completed .step-dot {
    background: var(--success);
    border-color: var(--success);
}

.step-indicator.completed .step-dot::after {
    content: '\2713';
}

.step-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
    font-weight: 500;
}

.step-indicator.active .step-label {
    color: var(--text-primary);
}

/* ========================================
   Wizard Container
   ======================================== */

.wizard-container {
    position: relative;
    min-height: 400px;
    margin-bottom: var(--spacing-xl);
}

.wizard-step {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    opacity: 0;
    visibility: hidden;
    transform: translateX(30px);
    transition: all var(--transition-normal);
}

.wizard-step.active {
    position: relative;
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.wizard-step.prev {
    transform: translateX(-30px);
}

.step-content {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    animation: fadeIn 0.4s ease-out;
}

.step-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.step-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* ========================================
   Form Elements
   ======================================== */

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

/* Input Fields */
input[type="number"],
input[type="text"],
textarea {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: all var(--transition-normal);
}

input[type="number"]:focus,
input[type="text"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

input[type="number"]::placeholder,
input[type="text"]::placeholder,
textarea::placeholder {
    color: var(--text-muted);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

.input-hint {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

/* Custom Select */
.select-wrapper {
    position: relative;
}

select {
    width: 100%;
    padding: var(--spacing-md);
    padding-right: 40px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    transition: all var(--transition-normal);
}

select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

select option {
    background: var(--bg-dark);
    color: var(--text-primary);
    padding: var(--spacing-sm);
}

.select-arrow {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 6px solid var(--text-secondary);
    pointer-events: none;
    transition: transform var(--transition-fast);
}

.select-wrapper:focus-within .select-arrow {
    transform: translateY(-50%) rotate(180deg);
}

/* Custom Slider */
.slider-group {
    margin-bottom: var(--spacing-xl);
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.slider-value {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
}

.slider {
    width: 100%;
    height: 8px;
    background: var(--bg-input);
    border-radius: 4px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.4);
    transition: all var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.5);
}

.slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--primary);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.4);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-sm);
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Info Box */
.info-box {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-lg);
}

.info-icon {
    font-size: 1.25rem;
    color: var(--primary);
    flex-shrink: 0;
}

.info-box p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Example Button */
.btn-example {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-example:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(139, 92, 246, 0.1);
}

.btn-example .icon {
    font-size: 1rem;
}

/* ========================================
   Buttons
   ======================================== */

.navigation-buttons {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-icon {
    font-size: 1.1em;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.3);
}

.btn-primary:hover:not(:disabled) {
    box-shadow: 0 6px 24px rgba(139, 92, 246, 0.4);
    transform: translateY(-2px);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    color: white;
    box-shadow: 0 4px 16px rgba(16, 185, 129, 0.3);
}

.btn-success:hover:not(:disabled) {
    box-shadow: 0 6px 24px rgba(16, 185, 129, 0.4);
    transform: translateY(-2px);
}

/* ========================================
   Results Section
   ======================================== */

.results-section {
    display: none;
    animation: fadeIn 0.6s ease-out;
}

.results-section.visible {
    display: block;
}

.results-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    animation: slideUp 0.6s ease-out;
}

.results-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--success) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.results-subtitle {
    color: var(--text-secondary);
}

/* Metric Cards */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.metric-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    transition: all var(--transition-normal);
    animation: slideUp 0.6s ease-out backwards;
}

.metric-card:nth-child(1) { animation-delay: 0.1s; }
.metric-card:nth-child(2) { animation-delay: 0.2s; }
.metric-card:nth-child(3) { animation-delay: 0.3s; }
.metric-card:nth-child(4) { animation-delay: 0.4s; }

.metric-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.metric-card.highlight {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15) 0%, rgba(6, 182, 212, 0.1) 100%);
    border-color: rgba(139, 92, 246, 0.3);
}

.metric-icon {
    font-size: 2rem;
    line-height: 1;
}

.metric-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.metric-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.metric-value {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.metric-card.highlight .metric-value {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.metric-confidence,
.metric-detail {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Charts Section */
.charts-section {
    margin-bottom: var(--spacing-2xl);
}

.chart-container {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    animation: fadeIn 0.6s ease-out 0.5s backwards;
}

.charts-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.chart-container.half {
    margin-bottom: 0;
}

.chart-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

/* Explanation Section */
.explanation-section {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    animation: fadeIn 0.6s ease-out 0.6s backwards;
}

.explanation-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.explanation-content {
    color: var(--text-secondary);
    line-height: 1.8;
}

.explanation-content p {
    margin-bottom: var(--spacing-md);
}

.explanation-content strong {
    color: var(--primary);
    font-weight: 600;
}

/* Assumptions Section */
.assumptions-section {
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    animation: fadeIn 0.6s ease-out 0.7s backwards;
}

.assumptions-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.assumptions-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    list-style: none;
}

.assumptions-list li {
    font-size: 0.8125rem;
    color: var(--text-muted);
    padding-left: var(--spacing-md);
    position: relative;
}

.assumptions-list li::before {
    content: '\2022';
    position: absolute;
    left: 0;
    color: var(--primary);
}

/* Results Actions */
.results-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* ========================================
   Animations
   ======================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 20px var(--primary-glow);
    }
    50% {
        box-shadow: 0 0 40px var(--primary-glow);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* Glow Animation for Highlight Card */
.metric-card.highlight {
    animation: slideUp 0.6s ease-out backwards, glow 3s ease-in-out infinite 1s;
}

/* ========================================
   Responsive Styles
   ======================================== */

/* Tablet */
@media (max-width: 768px) {
    .calculator-container {
        padding: var(--spacing-lg);
    }

    .title {
        font-size: 2rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

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

    .charts-row {
        grid-template-columns: 1fr;
    }

    .assumptions-list {
        grid-template-columns: 1fr;
    }

    .step-label {
        display: none;
    }

    .progress-steps {
        justify-content: space-around;
    }

    .results-actions {
        flex-direction: column;
    }

    .results-actions .btn {
        width: 100%;
    }
}

/* Mobile */
@media (max-width: 480px) {
    .calculator-container {
        padding: var(--spacing-md);
    }

    .title {
        font-size: 1.5rem;
    }

    .subtitle {
        font-size: 1rem;
    }

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

    .step-title {
        font-size: 1.25rem;
    }

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

    .metric-value {
        font-size: 1.5rem;
    }

    .navigation-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .slider-labels {
        font-size: 0.65rem;
    }
}

/* Desktop Large */
@media (min-width: 1200px) {
    .calculator-container {
        max-width: 1000px;
    }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
    body {
        background: white;
        color: black;
    }

    .calculator-container {
        max-width: 100%;
    }

    .navigation-buttons,
    .results-actions,
    .btn-example,
    .progress-container {
        display: none !important;
    }

    .wizard-container {
        display: none;
    }

    .results-section {
        display: block !important;
    }

    .metric-card,
    .chart-container,
    .explanation-section,
    .assumptions-section {
        background: #f5f5f5;
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* ========================================
   Utility Classes
   ======================================== */

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

.text-center {
    text-align: center;
}

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

.text-success {
    color: var(--success);
}

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

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