@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap');
:root {
    --primary: #00b8a9;
    --primary-dark: #00897b;
    --primary-light: #e0f7fa;
    --accent: #f9ed69;
    --danger: #ff5252;
    --success: #43e97b;
    --bg: #f7fafc;
    --card-bg: #fff;
    --shadow: 0 4px 24px rgba(0,0,0,0.07);
    --radius: 16px;
    --transition: 0.25s cubic-bezier(.4,0,.2,1);
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', Arial, sans-serif;
}
body {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--bg) 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    line-height: 1.6;
}
h2 {
    text-align: center;
}
.auth-container {
    width: 100%;
    max-width: 420px;
    background: var(--card-bg);
    padding: 36px 28px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.logo h1 {
    text-align: center;
    color: var(--primary);
    margin-bottom: 24px;
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: 1px;
}
.form {
    display: flex;
    flex-direction: column;
}
.input-group {
    display: flex;
    flex-direction: column;
    gap: 18px;
    margin-bottom: 22px;
}
.input-group input {
    padding: 14px 18px;
    border: 1.5px solid var(--primary-light);
    border-radius: 8px;
    font-size: 1.08rem;
    background: #f8f9fa;
    transition: border-color var(--transition), box-shadow var(--transition);
}
.input-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(0,184,169,0.13);
}
.form button {
    padding: 14px 32px;
    background: linear-gradient(90deg, var(--primary) 60%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 1.08rem;
    font-weight: 700;
    transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
    box-shadow: 0 2px 8px rgba(0,184,169,0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-align: center;
}
.form button:hover {
    background: linear-gradient(90deg, var(--primary-dark) 0%, var(--primary) 100%);
    color: var(--accent);
    transform: translateY(-2px) scale(1.03);
    box-shadow: 0 4px 16px rgba(0,184,169,0.13);
}
.toggle-link {
    text-align: center;
    margin-top: 18px;
    font-size: 1rem;
}
.toggle-link a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition);
}
.toggle-link a:hover {
    color: var(--primary-dark);
}
.hidden {
    display: none;
}
.error {
    color: var(--danger);
    margin-bottom: 15px;
    text-align: center;
    font-weight: 600;
}
.success {
    color: var(--success);
    margin-bottom: 15px;
    text-align: center;
    font-weight: 600;
}
.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 184, 169, 0.18);
    backdrop-filter: blur(2px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
}
.popup-overlay.show {
    opacity: 1;
    visibility: visible;
}
.popup {
    background: linear-gradient(135deg, var(--card-bg) 80%, var(--primary-light) 100%);
    padding: 36px 28px;
    border-radius: var(--radius);
    box-shadow: 0 10px 30px rgba(0, 184, 169, 0.18);
    max-width: 420px;
    width: 95%;
    text-align: center;
    transform: scale(0.7);
    transition: transform var(--transition);
}
.popup-overlay.show .popup {
    transform: scale(1);
}
.popup-icon {
    font-size: 48px;
    margin-bottom: 20px;
}
.popup-icon.success {
    color: #28a745;
}
.popup-icon.error {
    color: #dc3545;
}
.popup-icon.warning {
    color: var(--accent);
}
.popup-title {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 15px;
    color: var(--primary);
}
.popup-message {
    font-size: 16px;
    color: #666;
    margin-bottom: 25px;
    line-height: 1.5;
}
.popup-button {
    padding: 14px 36px;
    background: linear-gradient(90deg, var(--primary) 60%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: 24px;
    cursor: pointer;
    font-size: 1.08rem;
    font-weight: 700;
    transition: background var(--transition), box-shadow var(--transition);
    min-width: 120px;
    box-shadow: 0 2px 8px rgba(0,184,169,0.08);
}
.popup-button:hover {
    background: linear-gradient(90deg, var(--primary-dark) 0%, var(--primary) 100%);
    box-shadow: 0 4px 16px rgba(0,184,169,0.13);
    color: var(--accent);
}
.popup-button.success {
    background-color: #28a745;
}
.popup-button.success:hover {
    background-color: #218838;
}
.popup-button.error {
    background-color: #dc3545;
}
.popup-button.error:hover {
    background-color: #c82333;
}
@media (max-width: 600px) {
    .auth-container {
        padding: 16px 4px;
    }
    .popup {
        padding: 18px 4px;
    }
}