/* TON Theme – Blue, Dark, Clean */
:root {
    --ton-blue: #0088cc;
    --ton-blue-dark: #006699;
    --ton-blue-light: #33a6dd;
    --ton-bg-dark: #0f1a24;
    --ton-bg-card: #1c2a36;
    --ton-text-primary: #ffffff;
    --ton-text-secondary: #b0c4de;
    --ton-border: #2a3b47;
    --ton-shadow: rgba(0, 136, 204, 0.2);
}

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

body {
    background: var(--ton-bg-dark);
    color: var(--ton-text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.5;
    padding: 0;
    margin: 0;
}

.app-container {
    max-width: 480px;
    margin: 0 auto;
    background: var(--ton-bg-dark);
    min-height: 100vh;
    position: relative;
    padding-bottom: 80px;
}

/* Header */
.app-header {
    background: var(--ton-bg-card);
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--ton-border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.user-avatar {
    width: 36px;
    height: 36px;
    background: var(--ton-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 12px;
}

.avatar-text {
    font-size: 20px;
}

.user-name {
    font-weight: 600;
    font-size: 16px;
}

.balance-info {
    background: var(--ton-blue);
    padding: 6px 14px;
    border-radius: 20px;
    display: flex;
    gap: 4px;
    font-weight: bold;
}

.balance-amount {
    color: #fff;
}

.balance-currency {
    color: rgba(255,255,255,0.8);
}

/* Main sections */
.app-section {
    padding: 20px 16px;
    animation: fadeIn 0.2s ease;
}

.page-hidden {
    display: none !important;
}

h2 {
    text-align: center;
    margin-bottom: 24px;
    font-weight: 600;
    font-size: 24px;
    letter-spacing: -0.3px;
}

/* Buttons */
.action-button {
    width: 100%;
    background: var(--ton-bg-card);
    border: 1px solid var(--ton-border);
    border-radius: 16px;
    padding: 16px 20px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 14px;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--ton-text-primary);
    font-size: 16px;
    font-weight: 500;
    text-align: left;
}

.action-button:hover {
    background: var(--ton-blue-dark);
    border-color: var(--ton-blue);
    transform: translateY(-1px);
}

.button-icon {
    font-size: 24px;
    min-width: 32px;
}

.button-content {
    flex: 1;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 6px;
}

.button-text {
    font-weight: 600;
}

.task-reward, .ad-counter {
    font-size: 14px;
    color: var(--ton-blue-light);
    background: rgba(0,136,204,0.2);
    padding: 4px 8px;
    border-radius: 20px;
}

/* Navigation */
.app-nav {
    position: fixed;
    bottom: 0;
    max-width: 480px;
    width: 100%;
    background: var(--ton-bg-card);
    display: flex;
    justify-content: space-around;
    padding: 12px 16px;
    border-top: 1px solid var(--ton-border);
}

.nav-button {
    background: transparent;
    border: none;
    color: var(--ton-text-secondary);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 20px;
    cursor: pointer;
    transition: 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.nav-button.active {
    background: var(--ton-blue);
    color: white;
}

/* Friends block */
.friends-block, .earn-block {
    background: var(--ton-bg-card);
    border-radius: 24px;
    padding: 20px;
    border: 1px solid var(--ton-border);
}

.referral-link-area {
    display: flex;
    gap: 10px;
    margin: 16px 0;
}

.referral-link-area input {
    flex: 1;
    background: var(--ton-bg-dark);
    border: 1px solid var(--ton-border);
    border-radius: 12px;
    padding: 12px;
    color: white;
    font-size: 14px;
}

.copy-button {
    background: var(--ton-blue);
    border: none;
    border-radius: 12px;
    padding: 0 16px;
    cursor: pointer;
    font-size: 18px;
}

.referral-stats {
    display: flex;
    gap: 16px;
    margin-top: 16px;
}

.stat-item {
    flex: 1;
    background: var(--ton-bg-dark);
    border-radius: 16px;
    padding: 12px;
    text-align: center;
}

.stat-label {
    font-size: 12px;
    color: var(--ton-text-secondary);
}

.stat-value {
    font-size: 20px;
    font-weight: bold;
}

/* Withdrawal tabs */
.withdrawal-tabs {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.withdrawal-tab {
    flex: 1;
    background: var(--ton-bg-card);
    border: 1px solid var(--ton-border);
    border-radius: 30px;
    padding: 10px;
    cursor: pointer;
    text-align: center;
    font-weight: 500;
    transition: 0.2s;
}

.withdrawal-tab.active {
    background: var(--ton-blue);
    border-color: var(--ton-blue);
}

/* Inputs */
.amount-input-section {
    background: var(--ton-bg-card);
    border-radius: 24px;
    padding: 20px;
    margin-bottom: 20px;
}

.input-group {
    position: relative;
    margin: 12px 0;
}

.input-group input {
    width: 100%;
    padding: 16px 70px 16px 16px;
    background: var(--ton-bg-dark);
    border: 1px solid var(--ton-border);
    border-radius: 16px;
    color: white;
    font-size: 18px;
    font-weight: 500;
}

.input-suffix {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--ton-text-secondary);
}

.amount-info {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    margin-top: 8px;
}

.balance-status {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
}

.balance-status.neutral {
    background: rgba(255,255,255,0.1);
}
.balance-status.insufficient {
    background: rgba(255,80,80,0.2);
    color: #ff6b6b;
}
.balance-status.sufficient {
    background: rgba(0,200,100,0.2);
    color: #2ecc71;
}

/* Currency card */
.currency-info-card {
    background: var(--ton-bg-card);
    border-radius: 24px;
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid var(--ton-border);
}

.currency-title {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.currency-icon {
    font-size: 28px;
}

.currency-full-name {
    font-size: 18px;
    font-weight: 600;
    flex: 1;
}

.currency-badge {
    background: var(--ton-blue-dark);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
}

.requirement-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--ton-border);
}

.requirement-item:last-child {
    border-bottom: none;
}

/* Empty state */
.empty-history-state {
    text-align: center;
    padding: 40px 20px;
    background: var(--ton-bg-card);
    border-radius: 24px;
    color: var(--ton-text-secondary);
}

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

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.hidden {
    display: none;
}