:root {
    /* Telegram Theme Variables with Fallbacks */
    --bg-color: var(--tg-theme-bg-color, #0f172a);
    --secondary-bg-color: var(--tg-theme-secondary-bg-color, #1e293b);
    --text-color: var(--tg-theme-text-color, #f1f5f9);
    --hint-color: var(--tg-theme-hint-color, #94a3b8);
    --link-color: var(--tg-theme-link-color, #6366f1);
    --button-color: var(--tg-theme-button-color, #6366f1);
    --button-text-color: var(--tg-theme-button-text-color, #ffffff);

    /* Custom Design Tokens */
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --glass-bg: rgba(15, 23, 42, 0.7);
    --radius-lg: 20px;
    --radius-md: 12px;
    --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

/* Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    padding: 16px;
    min-height: 100vh;
}

.container {
    max-width: 600px;
    margin: 0 auto;
}

/* Typography */
h1 {
    font-size: 24px;
    font-weight: 800;
    text-align: center;
    margin-bottom: 8px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 14px;
    color: var(--hint-color);
    text-align: center;
    margin-bottom: 24px;
}

h2 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
}

/* Card */
.card {
    background: var(--secondary-bg-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid var(--card-border);
    box-shadow: var(--shadow);
}

/* Form Styles */
.form-grid {
    display: grid;
    gap: 16px;
}

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

.form-group.full-width {
    grid-column: 1 / -1;
}

label {
    font-size: 14px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
}

.hint {
    font-size: 11px;
    color: var(--hint-color);
    font-weight: 400;
    margin-top: 1px;
    display: block;
}

.field-note {
    font-size: 12px;
    color: var(--text-color);
    font-weight: 400;
    line-height: 1.6;
    margin-top: 6px;
    padding: 10px 12px;
    background: rgba(255, 255, 255, 0.04);
    border-left: 2px solid var(--button-color);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

input[type="text"],
input[type="number"] {
    width: 100%;
    padding: 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--card-border);
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 16px;
    outline: none;
    transition: all 0.2s;
}

input[type="text"]:focus,
input[type="number"]:focus {
    border-color: var(--button-color);
    background: rgba(var(--tg-theme-button-color, 99, 102, 241), 0.05);
}

input:disabled {
    opacity: 0.5;
    background: rgba(0, 0, 0, 0.2) !important;
    cursor: not-allowed;
}

/* Mode Switch */
.mode-switch-container {
    display: flex;
    gap: 10px;
    margin-top: 4px;
}

.mode-label {
    flex: 1;
    cursor: pointer;
    font-weight: 400;
}

.mode-label input {
    display: none;
}

.mode-label span {
    display: block;
    text-align: center;
    padding: 10px;
    background: var(--bg-color);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    font-size: 13px;
    transition: all 0.2s;
}

.mode-label input:checked+span {
    background: var(--button-color);
    color: var(--button-text-color);
    border-color: var(--button-color);
    font-weight: 600;
}

/* Advanced Section */
.advanced-toggle {
    margin-top: 10px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    color: var(--hint-color);
    transition: all 0.2s;
    border: 1px dashed var(--card-border);
    grid-column: 1 / -1;
}

.advanced-toggle:hover {
    background: rgba(255, 255, 255, 0.05);
}

.toggle-icon {
    font-size: 10px;
    transition: transform 0.3s;
}

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

.advanced-content {
    grid-column: 1 / -1;
    padding: 16px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: var(--radius-md);
    margin-bottom: 10px;
}

/* Tooltip */
.info-trigger {
    cursor: pointer;
    font-size: 12px;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.info-trigger:hover {
    opacity: 1;
}

.custom-tooltip {
    position: absolute;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 15px;
    border-radius: var(--radius-md);
    font-size: 14px;
    z-index: 100;
    max-width: 320px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    color: var(--text-color);
    line-height: 1.5;
    margin-top: 5px;
    backdrop-filter: blur(10px);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }

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

/* Promo Buttons */
.promo-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.btn-promo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 12px 20px;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 700;
    font-size: 14px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.btn-promo:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
}

.btn-promo:active {
    transform: scale(0.98);
}

.btn-logo {
    width: 24px;
    height: 24px;
    object-fit: contain;
    border-radius: 4px;
}

.btn-youtube {
    background: #FFFFFF;
    color: #000000;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.btn-course {
    background: #24A1DE;
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-freedom {
    background: #008751;
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Buttons */
.btn-primary {
    width: 100%;
    padding: 16px;
    border-radius: var(--radius-md);
    border: none;
    background: var(--button-color);
    color: var(--button-text-color);
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    margin-top: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-secondary {
    padding: 8px 16px;
    border-radius: var(--radius-md);
    border: 1px solid var(--card-border);
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 13px;
    cursor: pointer;
}

/* Tables */
.table-container {
    overflow-x: auto;
    margin: 0 -20px;
    padding: 0 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

th {
    text-align: left;
    padding: 12px 8px;
    color: var(--hint-color);
    font-weight: 600;
    border-bottom: 1px solid var(--card-border);
    white-space: nowrap;
}

td {
    padding: 12px 8px;
    border-bottom: 1px solid var(--card-border);
}

/* Chart */
.chart-container {
    height: 300px;
    margin: 20px 0;
}

/* Summary */
.summary-card {
    background: var(--accent-gradient);
    color: white;
}

.summary-card h2 {
    color: white;
}

.summary-item {
    background: rgba(255, 255, 255, 0.15);
    padding: 12px;
    border-radius: var(--radius-md);
    margin-bottom: 10px;
}

.budget-timeline {
    background: rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.milestone-list {
    list-style: none;
    margin-top: 8px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.milestone-list li {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 2px;
}

.milestone-list li:last-child {
    border-bottom: none;
}

.ms-age {
    opacity: 0.8;
}

.ms-value {
    font-weight: 700;
}

.summary-label {
    font-size: 12px;
    opacity: 0.9;
}

.summary-value {
    font-size: 18px;
    font-weight: 800;
}

/* Legend */
.chart-legend {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 15px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-md);
    border: 1px solid var(--card-border);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.legend-dot.safe {
    background-color: #10b981;
    box-shadow: 0 0 8px #10b981;
}

.legend-dot.warning {
    background-color: #6366f1;
    box-shadow: 0 0 8px #6366f1;
}

.legend-dot.danger {
    background-color: #ef4444;
    box-shadow: 0 0 8px #ef4444;
}

.legend-text {
    font-size: 12px;
    color: var(--hint-color);
    white-space: nowrap;
}

/* Helpers */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--hint-color);
    border-top-color: var(--button-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 480px) {
    body {
        padding: 12px;
    }

    .card {
        padding: 16px;
    }

    h1 {
        font-size: 20px;
    }
}