:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --bg-gradient-start: #0f172a;
    --bg-gradient-end: #1e1b4b;
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    --input-bg: rgba(0, 0, 0, 0.2);
    --input-border: rgba(255, 255, 255, 0.15);
    --input-focus: rgba(79, 70, 229, 0.5);
}

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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

/* Background animated elements */
body::before, body::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    filter: blur(100px);
    z-index: -1;
    animation: float 10s infinite ease-in-out alternate;
}

body::before {
    background: rgba(79, 70, 229, 0.4);
    top: -100px;
    left: -100px;
}

body::after {
    background: rgba(236, 72, 153, 0.3);
    bottom: -100px;
    right: -100px;
    animation-delay: 5s;
}

@keyframes float {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
    z-index: 1;
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--glass-shadow);
    transform: translateY(20px);
    opacity: 0;
    animation: fadeUp 0.8s forwards cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeUp {
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.brand-title {
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 8px;
    background: linear-gradient(to right, #fff, #a5b4fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: 1px;
}

.subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 32px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

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

.input-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.3s;
}

.input-group:focus-within label {
    color: var(--text-primary);
}

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

input {
    width: 100%;
    padding: 12px 16px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 14px;
    transition: all 0.3s ease;
    outline: none;
    font-family: inherit;
}

input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--input-focus);
    background: rgba(0, 0, 0, 0.4);
}

input::placeholder {
    color: rgba(255, 255, 255, 0.3);
}

.toggle-password {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.3s;
}

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

.submit-btn {
    margin-top: 10px;
    padding: 14px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 48px;
    overflow: hidden;
}

.submit-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.submit-btn:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

.submit-btn:hover:not(:disabled)::before {
    left: 100%;
}

.submit-btn:active:not(:disabled) {
    transform: translateY(0);
}

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

.error-message {
    color: #f87171;
    font-size: 13px;
    text-align: center;
    margin-top: -10px;
    margin-bottom: 5px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Loader */
.loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
    position: absolute;
}

.hidden {
    display: none;
}

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

.footer {
    position: fixed;
    bottom: 20px;
    width: 100%;
    text-align: center;
    color: var(--text-secondary);
    font-size: 12px;
    z-index: 1;
}

/* Responsive adjustments */
@media (max-width: 480px) {
    .glass-card {
        padding: 30px 20px;
    }
}