:root {
    --bg-primary: #0a0f0a;
    --bg-secondary: #121a12;
    --bg-card: rgba(20, 35, 20, 0.8);
    --green-primary: #008751;
    --green-secondary: #00a862;
    --green-dark: #004d2e;
    --green-glow: rgba(0, 135, 81, 0.3);
    --text-primary: #ffffff;
    --text-secondary: #a1aaa1;
    --text-muted: #717a71;
    --border-color: rgba(255, 255, 255, 0.1);
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    --radius: 12px;
    --radius-lg: 20px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

/* Background Animation */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.bg-gradient {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at 20% 20%, var(--green-dark) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(59, 130, 246, 0.15) 0%, transparent 50%);
}

.floating-shapes {
    position: absolute;
    width: 100%;
    height: 100%;
}

.shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.1;
    background: var(--green-primary);
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 400px;
    height: 400px;
    top: -100px;
    left: -100px;
    animation-delay: 0s;
}

.shape-2 {
    width: 300px;
    height: 300px;
    bottom: 20%;
    right: -50px;
    animation-delay: -5s;
}

.shape-3 {
    width: 200px;
    height: 200px;
    top: 50%;
    left: 30%;
    animation-delay: -10s;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    50% {
        transform: translate(30px, -30px) scale(1.1);
    }
}

/* Glass Card */
.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(20px);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 16px 0;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 24px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
}

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

.nav {
    display: flex;
    gap: 32px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

/* Hero */
.hero {
    padding: 140px 0 60px;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    padding: 8px 16px;
    background: var(--green-dark);
    border-radius: 30px;
    font-size: 14px;
    margin-bottom: 24px;
    border: 1px solid var(--green-primary);
}

.hero-title {
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(135deg, var(--green-secondary), var(--green-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Calculator Section */
.calculator-section {
    padding: 40px 0 80px;
}

.calculator-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

/* Input Panel */
.input-panel {
    padding: 32px;
}

.panel-header {
    margin-bottom: 32px;
}

.panel-title {
    font-size: 24px;
    font-weight: 700;
    margin-top: 16px;
}

.step-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
}

.step {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    background: var(--bg-secondary);
    color: var(--text-muted);
    border: 2px solid var(--border-color);
    transition: all 0.3s;
}

.step.active {
    background: var(--green-primary);
    color: white;
    border-color: var(--green-primary);
}

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

.step-line {
    width: 40px;
    height: 2px;
    background: var(--border-color);
}

/* Form */
.tax-form {
    position: relative;
}

.form-step {
    display: none;
    animation: fadeIn 0.3s ease;
}

.form-step.active {
    display: block;
}

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

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

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

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 12px;
    font-size: 15px;
}

.form-select,
.form-input {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 16px;
    transition: all 0.3s;
}

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

.input-wrapper {
    position: relative;
}

.currency-symbol {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-weight: 600;
}

.input-wrapper .form-input {
    padding-left: 40px;
}

.input-hint {
    display: block;
    margin-top: 8px;
    font-size: 13px;
    color: var(--text-muted);
}

/* Radio & Checkbox */
.radio-group,
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.radio-option,
.checkbox-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.3s;
}

.radio-option:hover,
.checkbox-option:hover {
    border-color: var(--green-primary);
}

.radio-option input,
.checkbox-option input {
    display: none;
}

.radio-custom,
.checkbox-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    position: relative;
    transition: all 0.3s;
}

.checkbox-custom {
    border-radius: 4px;
}

.radio-option input:checked~.radio-custom,
.checkbox-option input:checked~.checkbox-custom {
    border-color: var(--green-primary);
    background: var(--green-primary);
}

.radio-custom::after,
.checkbox-custom::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    transition: transform 0.2s;
}

.radio-custom::after {
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
}

.checkbox-custom::after {
    content: '✓';
    color: white;
    font-size: 12px;
}

.radio-option input:checked~.radio-custom::after,
.checkbox-option input:checked~.checkbox-custom::after {
    transform: translate(-50%, -50%) scale(1);
}

.radio-label,
.checkbox-label {
    display: flex;
    flex-direction: column;
}

.radio-label small,
.checkbox-label small {
    color: var(--text-muted);
    font-size: 13px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--green-primary), var(--green-secondary));
    color: white;
    box-shadow: 0 4px 16px var(--green-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px var(--green-glow);
}

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

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    border-color: var(--green-primary);
}

.form-buttons {
    display: flex;
    gap: 12px;
}

.btn-loader {
    display: none;
}

.btn.loading .btn-text {
    display: none;
}

.btn.loading .btn-loader {
    display: flex;
    gap: 4px;
}

.btn-loader::after {
    content: '...';
    animation: dots 1s infinite;
}

@keyframes dots {

    0%,
    20% {
        content: '.';
    }

    40% {
        content: '..';
    }

    60%,
    100% {
        content: '...';
    }
}

/* Results Panel */
.results-panel {
    padding: 32px;
    min-height: 500px;
    display: flex;
    flex-direction: column;
}

.results-placeholder {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-muted);
}

.placeholder-icon {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.results-placeholder h3 {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.results-header h3 {
    font-size: 20px;
    font-weight: 700;
}

.tax-year-badge {
    padding: 4px 12px;
    background: var(--green-dark);
    border-radius: 20px;
    font-size: 12px;
    color: var(--green-secondary);
}

/* Tax Cards */
.tax-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.tax-card {
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    text-align: center;
}

.tax-card.primary {
    background: linear-gradient(135deg, var(--green-dark), var(--green-primary));
}

.card-label {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.card-value {
    display: block;
    font-size: 24px;
    font-weight: 700;
}

.card-value.green {
    color: var(--success);
}

.card-value.orange {
    color: var(--warning);
}

.card-subtext {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* Breakdown */
.breakdown-section {
    margin-bottom: 24px;
}

.breakdown-section h4 {
    font-size: 16px;
    margin-bottom: 16px;
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.breakdown-bar {
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 4px;
    margin-top: 8px;
    overflow: hidden;
}

.breakdown-fill {
    height: 100%;
    background: var(--green-primary);
    border-radius: 4px;
    transition: width 0.5s;
}

/* Advice */
.advice-section {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 24px;
}

.advice-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

.advice-header h4 {
    font-size: 16px;
}

#taxAdvice p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 12px;
}

#taxAdvice ul {
    padding-left: 20px;
    color: var(--text-secondary);
    font-size: 14px;
}

#taxAdvice li {
    margin-bottom: 8px;
}

.results-actions {
    display: flex;
    gap: 12px;
}

.results-actions .btn {
    flex: 1;
}

/* Guide Section */
.guide-section {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
}

.guide-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.guide-card {
    padding: 32px;
}

.guide-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.guide-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.guide-card p {
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.guide-rates {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.rate-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 12px;
    background: var(--bg-secondary);
    border-radius: 8px;
    font-size: 14px;
}

.rate {
    color: var(--green-secondary);
    font-weight: 600;
}

.guide-list {
    padding-left: 20px;
    color: var(--text-secondary);
    font-size: 14px;
}

.guide-list li {
    margin-bottom: 8px;
}

/* FAQ Section */
.faq-section {
    padding: 80px 0;
}

.faq-grid {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    text-align: left;
}

.faq-icon {
    font-size: 24px;
    color: var(--green-primary);
    transition: transform 0.3s;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s;
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 20px 20px;
    color: var(--text-secondary);
}

/* Footer */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.footer-brand p {
    color: var(--text-muted);
    width: 100%;
    margin-top: 8px;
}

.footer-bottom {
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 16px 24px;
    background: var(--success);
    color: white;
    border-radius: var(--radius);
    font-weight: 500;
    opacity: 0;
    transition: all 0.3s;
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Responsive */
@media (max-width: 900px) {
    .calculator-wrapper {
        grid-template-columns: 1fr;
    }

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

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

@media (max-width: 600px) {
    .nav {
        display: none;
    }

    .hero-title {
        font-size: 28px;
    }

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