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

:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --bg: #F1F5F9;
    --card-bg: #FFFFFF;
    --text: #1E293B;
    --text-muted: #64748B;
    --border: #E2E8F0;
    --input-bg: #F8FAFC;
    --input-focus: #4F46E5;
    --error: #DC2626;
    --error-bg: #FEF2F2;
    --error-border: #FCA5A5;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 4px 24px rgba(0, 0, 0, 0.05);
    --radius: 8px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

.login-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    position: relative;
}

.login-card {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 2.5rem;
    width: 100%;
    max-width: 420px;
    border: 1px solid var(--border);
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.logo {
    margin-bottom: 1rem;
}

.login-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.25rem;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 0.375rem;
}

.forgot-link {
    font-weight: 400;
    color: var(--primary);
    text-decoration: none;
    font-size: 0.8125rem;
}

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

.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="text"] {
    width: 100%;
    padding: 0.625rem 0.75rem;
    font-size: 0.9375rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--input-bg);
    color: var(--text);
    transition: border-color 0.15s, box-shadow 0.15s;
    outline: none;
}

.form-group input:focus {
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group input::placeholder {
    color: #94A3B8;
}

.password-wrapper {
    position: relative;
}

.password-wrapper input {
    padding-right: 2.75rem;
}

.toggle-password {
    position: absolute;
    right: 0.625rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0.25rem;
    display: flex;
    align-items: center;
}

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

.checkbox-group {
    margin-bottom: 1.5rem;
}

.checkbox-label {
    display: flex !important;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-muted);
    justify-content: flex-start !important;
}

.checkbox-label input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    accent-color: var(--primary);
    cursor: pointer;
}

.btn-submit {
    width: 100%;
    padding: 0.7rem 1rem;
    font-size: 0.9375rem;
    font-weight: 600;
    color: #fff;
    background: var(--primary);
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 2.75rem;
}

.btn-submit:hover {
    background: var(--primary-hover);
}

.btn-submit:active {
    transform: scale(0.99);
}

.btn-submit:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.spinner {
    animation: spin 0.8s linear infinite;
}

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

.login-footer {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
}

.login-footer p {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* Toast notification */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(1rem);
    background: var(--error-bg);
    color: var(--error);
    border: 1px solid var(--error-border);
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    opacity: 0;
    transition: opacity 0.2s, transform 0.2s;
    z-index: 1000;
    white-space: nowrap;
}

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

.page-footer {
    text-align: center;
    padding: 1rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Shake animation for form errors */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-4px); }
    40%, 80% { transform: translateX(4px); }
}

.shake {
    animation: shake 0.4s ease-in-out;
}

/* Responsive */
@media (max-width: 480px) {
    .login-card {
        padding: 1.75rem;
        border-radius: 0;
        box-shadow: none;
        border: none;
    }

    .login-container {
        padding: 0;
        align-items: flex-start;
    }
}