:root {
    --bg-dark: #0b0f19;
    --card-bg: rgba(18, 24, 38, 0.75);
    --card-border: rgba(255, 255, 255, 0.08);
    --primary: #3b82f6;
    --primary-glow: rgba(59, 130, 246, 0.5);
    --accent-purple: #8b5cf6;
    --accent-pink: #ec4899;
    --success: #10b981;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --font-heading: 'Outfit', -apple-system, sans-serif;
    --font-body: 'Inter', -apple-system, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: var(--font-body);
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-dark);
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(59, 130, 246, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(139, 92, 246, 0.15) 0%, transparent 40%);
    background-attachment: fixed;
    color: var(--text-main);
    padding: 12px;
    display: flex;
    justify-content: center;
    min-height: 100vh;
}

.app-container {
    width: 100%;
    max-width: 480px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

/* Header Cyberpunk Banner */
.app-header {
    position: relative;
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid var(--card-border);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
}

.header-bg {
    position: relative;
    width: 100%;
    height: 140px;
}

.hero-banner-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.header-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(11, 15, 25, 0.2) 0%, rgba(11, 15, 25, 0.95) 100%);
}

.header-content {
    position: absolute;
    inset: 0;
    padding: 14px 16px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    z-index: 2;
}

.brand-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(15, 23, 42, 0.75);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(59, 130, 246, 0.3);
    padding: 6px 12px;
    border-radius: 20px;
}

.brand-title {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 0.9rem;
    letter-spacing: 1px;
    background: linear-gradient(135deg, #60a5fa 0%, #a78bfa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.user-pill {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(12px);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    border: 1px solid var(--card-border);
}

.user-balance-badge {
    color: #34d399;
    font-weight: 700;
}

.hero-text h1 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 800;
    color: #fff;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.6);
}

.hero-text p {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Dynamic Navigation Tabs */
.nav-tabs {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    padding: 5px;
    border-radius: 18px;
    border: 1px solid var(--card-border);
}

.tab-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 8px 2px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.25 ease;
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent-purple) 100%);
    color: #fff;
    box-shadow: 0 4px 16px var(--primary-glow);
}

/* Cards System */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.card-title-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-title {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
}

/* Region Selector Grid */
.region-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.region-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    border-radius: 14px;
    color: var(--text-main);
    cursor: pointer;
    transition: all 0.2s ease;
}

.region-btn.active {
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.15);
    box-shadow: 0 0 14px rgba(59, 130, 246, 0.3);
}

.region-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1.2;
}

.region-info strong {
    font-size: 0.85rem;
}

.region-info small {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Calculator Grid */
.calc-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.calc-title-box {
    display: flex;
    align-items: center;
    gap: 8px;
}

.calc-title-box h3 {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 800;
}

.rate-badge {
    background: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.3);
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.rate-badge strong {
    color: var(--success);
}

.calc-inputs-grid {
    display: flex;
    align-items: center;
    gap: 8px;
}

.input-card {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
    background: rgba(11, 15, 25, 0.6);
    padding: 10px;
    border-radius: 14px;
    border: 1px solid var(--card-border);
}

.input-card.highlight {
    border-color: rgba(139, 92, 246, 0.4);
    background: rgba(139, 92, 246, 0.05);
}

.input-card label {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.input-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.input-wrapper input {
    width: 70%;
    background: transparent;
    border: none;
    color: #fff;
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 800;
    outline: none;
}

.currency-tag {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
}

.currency-tag.steam {
    color: #60a5fa;
}

.calc-arrow-box {
    color: var(--primary);
    font-size: 1.2rem;
    margin-top: 14px;
}

/* Presets */
.presets-row {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 5px;
}

.preset-btn {
    position: relative;
    padding: 10px 2px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    color: var(--text-main);
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

.preset-btn.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent-purple) 100%);
    border-color: transparent;
    box-shadow: 0 4px 12px var(--primary-glow);
}

.hot-tag {
    position: absolute;
    top: -6px;
    right: 2px;
    background: var(--accent-pink);
    color: #fff;
    font-size: 0.55rem;
    padding: 1px 4px;
    border-radius: 6px;
    font-weight: 900;
}

/* Steam Login Input */
.login-input-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.login-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(11, 15, 25, 0.8);
    border: 1px solid var(--card-border);
    border-radius: 14px;
    padding: 12px 14px;
}

.login-wrapper input {
    flex: 1;
    background: transparent;
    border: none;
    color: #fff;
    font-size: 0.95rem;
    outline: none;
}

.input-hint-box {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.73rem;
    color: var(--text-muted);
}

/* Glow CTA Button */
.btn-glow-primary {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    border: none;
    border-radius: 16px;
    color: #fff;
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 800;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
    transition: all 0.2s ease;
}

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

/* Compliance Legal Footer */
.app-footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 8px;
    padding: 16px 12px;
    margin-top: 10px;
    background: rgba(11, 15, 25, 0.6);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    font-size: 0.72rem;
    color: var(--text-muted);
}

.footer-links a {
    color: #60a5fa;
    text-decoration: none;
    font-weight: 600;
}

.footer-copy a {
    color: var(--text-muted);
    text-decoration: underline;
}

/* Referrals Page */
.referral-hero {
    text-align: center;
    gap: 10px;
}

.hero-glow-badge {
    align-self: center;
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.2) 0%, rgba(139, 92, 246, 0.2) 100%);
    border: 1px solid rgba(236, 72, 153, 0.4);
    color: #f472b6;
    font-size: 0.75rem;
    font-weight: 800;
    padding: 4px 14px;
    border-radius: 20px;
}

.referral-hero h2 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 800;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 14px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-num {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 900;
    color: #60a5fa;
}

.stat-card.gold .stat-num {
    color: #f59e0b;
}

.stat-lbl {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.ref-input-group {
    display: flex;
    gap: 8px;
}

.ref-input-group input {
    flex: 1;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 10px;
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Profile Card */
.profile-card {
    align-items: center;
    text-align: center;
    gap: 8px;
}

.profile-avatar-box {
    font-size: 3rem;
    background: rgba(255, 255, 255, 0.05);
    padding: 16px;
    border-radius: 50%;
    border: 1px solid var(--card-border);
}

.profile-balance-card {
    width: 100%;
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: 16px;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 10px;
}

.bal-title {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.bal-value {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--success);
}

.bal-sub {
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* Tab Transitions */
.tab-content {
    display: none;
    flex-direction: column;
    gap: 14px;
}

.tab-content.active {
    display: flex;
    animation: fadeInSlide 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeInSlide {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Toast */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--success);
    color: #fff;
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    transition: transform 0.3s ease;
    z-index: 1000;
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

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