:root {
    --bg-dark: #121824;
    --card-bg: #1e293b;
    --card-bg-light: #283548;
    --border-color: #334155;
    --accent-teal: #00adb5;
    --accent-teal-hover: #00c4ce;
    --accent-glow: rgba(0, 173, 181, 0.25);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --positive: #10b981;
    --negative: #ef4444;
    --radius-lg: 20px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-main: 0 20px 40px -15px rgba(0, 0, 0, 0.5), 0 0 25px rgba(0, 173, 181, 0.08);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    overflow-x: hidden;
}

.auth-container {
    width: 100%;
    max-width: 440px;
    position: relative;
    z-index: 1;
}

.bg-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(90px);
    pointer-events: none;
    z-index: 0;
}

.glow-1 {
    width: 280px;
    height: 280px;
    background: var(--accent-teal);
    opacity: 0.15;
    top: -60px;
    left: -60px;
}

.glow-2 {
    width: 240px;
    height: 240px;
    background: #6366f1;
    opacity: 0.12;
    bottom: -50px;
    right: -50px;
}

.auth-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    box-shadow: var(--shadow-main);
    backdrop-filter: blur(12px);
    position: relative;
    z-index: 2;
    animation: fadeInScale 0.4s ease-out forwards;
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.96) translateY(12px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.auth-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 28px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--accent-teal);
}

.logo-icon {
    stroke: var(--accent-teal);
    filter: drop-shadow(0 0 6px var(--accent-glow));
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.version-badge {
    font-size: 11px;
    font-weight: 600;
    color: var(--accent-teal);
    background: rgba(0, 173, 181, 0.12);
    border: 1px solid rgba(0, 173, 181, 0.25);
    padding: 3px 8px;
    border-radius: 20px;
}

.auth-tabs {
    display: flex;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 4px;
    margin-bottom: 24px;
    position: relative;
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border-radius: calc(var(--radius-md) - 2px);
    transition: color var(--transition-fast);
    z-index: 2;
}

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

.tab-glider {
    position: absolute;
    top: 4px;
    bottom: 4px;
    left: 4px;
    width: calc(50% - 4px);
    background: var(--card-bg-light);
    border: 1px solid var(--border-color);
    border-radius: calc(var(--radius-md) - 2px);
    transition: transform var(--transition-smooth);
    z-index: 1;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.auth-tabs[data-active="register"] .tab-glider {
    transform: translateX(100%);
}

.auth-alert {
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 20px;
    animation: alertSlideDown 0.25s ease-out;
}

@keyframes alertSlideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.auth-alert.error {
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
}

.auth-alert.success {
    background: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #6ee7b7;
}

.auth-form {
    display: none;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.auth-form.active {
    display: block;
    opacity: 1;
}

.form-group {
    margin-bottom: 18px;
}

.label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

label {
    display: block;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.forgot-link {
    font-size: 12px;
    color: var(--accent-teal);
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.forgot-link:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 14px;
    color: var(--text-muted);
    pointer-events: none;
    transition: color var(--transition-fast);
}

.input-field {
    width: 100%;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 14px 12px 42px;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.input-field::placeholder {
    color: var(--text-muted);
}

.input-field:focus {
    border-color: var(--accent-teal);
    box-shadow: 0 0 0 3px var(--accent-glow);
    background: rgba(15, 23, 42, 0.8);
}

.input-wrapper:focus-within .input-icon {
    color: var(--accent-teal);
}

.select-field {
    appearance: none;
    cursor: pointer;
    padding-right: 36px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%3C94a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
}

.select-field option {
    background-color: var(--card-bg);
    color: var(--text-primary);
}

.toggle-password {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: color var(--transition-fast);
}

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

.checkbox-group {
    margin-top: -4px;
    margin-bottom: 22px;
}

.checkbox-container {
    display: inline-flex;
    align-items: center;
    position: relative;
    padding-left: 28px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    user-select: none;
    text-transform: none;
    font-weight: 500;
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 18px;
    width: 18px;
    background-color: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.checkbox-container:hover input ~ .checkmark {
    border-color: var(--accent-teal);
}

.checkbox-container input:checked ~ .checkmark {
    background-color: var(--accent-teal);
    border-color: var(--accent-teal);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
    left: 6px;
    top: 2px;
    width: 4px;
    height: 9px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.checkbox-container input:checked ~ .checkmark:after {
    display: block;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 14.5px;
    font-weight: 600;
    padding: 13px 20px;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background-color: var(--accent-teal);
    color: #ffffff;
    box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-primary:hover {
    background-color: var(--accent-teal-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 18px rgba(0, 173, 181, 0.35);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-block {
    width: 100%;
}

.btn-arrow {
    transition: transform var(--transition-fast);
}

.btn-primary:hover .btn-arrow {
    transform: translateX(4px);
}

.auth-footer {
    margin-top: 24px;
    text-align: center;
    font-size: 11.5px;
    color: var(--text-muted);
}

@media (max-width: 480px) {
    .auth-card {
        padding: 28px 20px;
    }
}