:root {
    --primary-blue: #1a56db;
    --secondary-blue: #3b82f6;
    --light-blue: #60a5fa;
    --gold: #f59e0b;
    --gold-light: #fbbf24;
    --gold-soft: #fcd34d;
    --dark: #0f172a;
    --darker: #020617;
    --gray: #64748b;
    --light-gray: #e2e8f0;
    --white: #ffffff;
    --success: #10b981;
    --error: #ef4444;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background: var(--white);
    min-height: 100vh;
    color: var(--dark);
    overflow-x: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Login Container */
.login-container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 480px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Logo */
.logo-container {
    margin-bottom: 30px;
    text-align: center;
}

.logo {
    max-width: 280px;
    width: 100%;
    height: auto;
    filter: drop-shadow(0 4px 15px rgba(26, 86, 219, 0.15));
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
}

/* Auth Card */
.auth-card {
    width: 100%;
    background: var(--white);
    border: 1px solid var(--light-gray);
    border-radius: 24px;
    padding: 35px;
    box-shadow: 0 4px 25px rgba(0, 0, 0, 0.08);
}

/* Tabs */
.auth-tabs {
    display: flex;
    background: var(--light-gray);
    border-radius: 12px;
    padding: 5px;
    margin-bottom: 30px;
    position: relative;
}

.tab-btn {
    flex: 1;
    padding: 12px 20px;
    background: transparent;
    border: none;
    color: var(--gray);
    font-family: 'Poppins', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    z-index: 2;
    border-radius: 8px;
}

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

.tab-indicator {
    position: absolute;
    top: 5px;
    left: 5px;
    width: calc(50% - 5px);
    height: calc(100% - 10px);
    background: linear-gradient(145deg, var(--primary-blue), var(--secondary-blue));
    border-radius: 8px;
    transition: transform 0.3s ease;
    z-index: 1;
}

.tab-btn[data-tab="register"].active ~ .tab-indicator,
.auth-tabs:has(.tab-btn[data-tab="register"].active) .tab-indicator {
    transform: translateX(100%);
}

/* Forms */
.auth-form {
    display: none;
    animation: fadeInForm 0.4s ease-out;
}

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

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

.form-header {
    text-align: center;
    margin-bottom: 25px;
}

.form-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.form-header p {
    font-size: 0.9rem;
    color: var(--gray);
}

/* Form Groups */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--dark);
    margin-bottom: 8px;
}

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

.input-wrapper svg {
    position: absolute;
    left: 15px;
    width: 20px;
    height: 20px;
    color: var(--gray);
    transition: color 0.3s ease;
}

.input-wrapper input {
    width: 100%;
    padding: 15px 15px 15px 50px;
    background: var(--white);
    border: 2px solid var(--light-gray);
    border-radius: 12px;
    color: var(--dark);
    font-family: 'Poppins', sans-serif;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.input-wrapper input::placeholder {
    color: var(--gray);
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--secondary-blue);
    background: rgba(26, 86, 219, 0.02);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.input-wrapper input:focus + svg,
.input-wrapper:focus-within svg:first-child {
    color: var(--secondary-blue);
}

/* Toggle Password */
.toggle-password {
    position: absolute;
    right: 15px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-password svg {
    position: relative;
    left: 0;
    width: 20px;
    height: 20px;
    color: var(--gray);
    transition: color 0.3s ease;
}

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

.toggle-password .hidden {
    display: none;
}

/* Form Row */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

/* Submit Button */
.submit-btn {
    width: 100%;
    padding: 16px 30px;
    background: linear-gradient(145deg, var(--primary-blue), var(--secondary-blue));
    border: none;
    border-radius: 12px;
    color: var(--white);
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(26, 86, 219, 0.3);
    margin-top: 10px;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(26, 86, 219, 0.4);
}

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

.submit-btn svg {
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
}

.submit-btn:hover svg {
    transform: translateX(5px);
}

.submit-btn.loading {
    pointer-events: none;
    opacity: 0.8;
}

.submit-btn.loading span {
    display: none;
}

.submit-btn.loading::after {
    content: '';
    width: 20px;
    height: 20px;
    border: 3px solid var(--white);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Footer */
.login-footer {
    margin-top: 25px;
    text-align: center;
}

.login-footer p {
    font-size: 0.85rem;
    color: var(--gray);
}

.login-footer a {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.login-footer a:hover {
    color: var(--secondary-blue);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--white);
    border: 1px solid var(--light-gray);
    color: var(--dark);
    padding: 15px 25px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    opacity: 0;
    transition: all 0.4s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    border-color: var(--success);
}

.toast.error {
    border-color: var(--error);
}

.toast-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toast-icon svg {
    width: 24px;
    height: 24px;
}

.toast.success .success-icon {
    color: var(--success);
}

.toast.error .error-icon {
    color: var(--error);
}

.toast-icon .hidden {
    display: none;
}

.toast-message {
    font-size: 0.9rem;
    font-weight: 500;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--white);
    border: 1px solid var(--light-gray);
    border-radius: 24px;
    padding: 40px;
    max-width: 400px;
    width: 90%;
    text-align: center;
    transform: scale(0.9);
    transition: transform 0.3s ease;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(145deg, var(--success), #059669);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    box-shadow: 0 10px 30px rgba(16, 185, 129, 0.3);
}

.modal-icon svg {
    width: 40px;
    height: 40px;
    color: var(--white);
}

.modal-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 10px;
}

.modal-content p {
    font-size: 0.95rem;
    color: var(--gray);
    margin-bottom: 20px;
}

.modal-content .coupon-display {
    background: var(--white);
    border: 2px dashed var(--gold-soft);
    border-radius: 12px;
    padding: 15px 25px;
    margin-bottom: 15px;
}

.modal-content .coupon-display span {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 3px;
    background: linear-gradient(90deg, var(--gold-soft), var(--gold-light), var(--gold-soft));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.coupon-tip {
    font-size: 0.8rem !important;
    color: var(--primary-blue) !important;
}

.modal-btn {
    width: 100%;
    padding: 14px 30px;
    background: linear-gradient(145deg, var(--primary-blue), var(--secondary-blue));
    border: none;
    border-radius: 12px;
    color: var(--white);
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.modal-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(26, 86, 219, 0.4);
}

/* Responsive */
@media (max-width: 480px) {
    .login-container {
        padding: 15px;
    }

    .logo {
        max-width: 220px;
    }

    .auth-card {
        padding: 25px 20px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .form-header h2 {
        font-size: 1.3rem;
    }

    .input-wrapper input {
        padding: 13px 13px 13px 45px;
        font-size: 0.9rem;
    }

    .submit-btn {
        padding: 14px 25px;
    }
}