:root {
    --intel-blue: #0071C5;
    --intel-cyan: #00C7FD;
    --intel-dark-blue: #004585;
    --bg-dark: #07090F;
    --bg-lighter: #0D1322;
    --text-primary: #FFFFFF;
    --text-secondary: #90A0B7;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-glow: rgba(0, 199, 253, 0.15);
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-medium: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    --border-radius: 16px;
    --input-radius: 12px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    position: relative;
}

/* Background Effects */
.background-effects {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}

.glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.5;
    animation: float 15s infinite alternate ease-in-out;
}

.glow-1 {
    top: -10%;
    right: -5%;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, var(--intel-blue), transparent 60%);
    animation-delay: 0s;
}

.glow-2 {
    bottom: -20%;
    left: -10%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, var(--intel-dark-blue), transparent 60%);
    animation-delay: -5s;
}

.glow-3 {
    top: 40%;
    left: 20%;
    width: 30vw;
    height: 30vw;
    background: radial-gradient(circle, var(--intel-cyan), transparent 60%);
    opacity: 0.3;
    animation: pulseGlow 8s infinite alternate ease-in-out;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(-50px, 50px) scale(1.1); }
}

@keyframes pulseGlow {
    0% { transform: scale(0.8); opacity: 0.2; }
    100% { transform: scale(1.2); opacity: 0.4; }
}

/* Container & Card */
.login-container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 480px;
    padding: 24px;
    animation: fadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.login-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 40px;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.4), 
                inset 0 1px 0 rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
}

.login-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0, 199, 253, 0.5), transparent);
}

/* Header */
.brand-header {
    text-align: center;
    margin-bottom: 40px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: iconPulse 4s infinite ease-in-out;
}

@keyframes iconPulse {
    0%, 100% { filter: drop-shadow(0 0 8px rgba(0, 199, 253, 0.2)); }
    50% { filter: drop-shadow(0 0 16px rgba(0, 199, 253, 0.6)); }
}

.logo-icon svg {
    width: 100%;
    height: 100%;
}

h1 {
    font-size: 24px;
    font-weight: 600;
    letter-spacing: -0.5px;
    background: linear-gradient(to right, #fff, var(--intel-cyan));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 4px;
}

.brand-header p {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 400;
}

/* Forms & Inputs */
.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);
    padding-left: 2px;
}

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

.input-wrapper .icon {
    position: absolute;
    left: 16px;
    color: #5B6A82;
    font-size: 14px;
    transition: color var(--transition-medium);
}

.input-wrapper input {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    border-radius: var(--input-radius);
    padding: 14px 16px 14px 44px;
    color: #fff;
    font-family: inherit;
    font-size: 15px;
    transition: all var(--transition-medium);
    outline: none;
}

.input-wrapper input::placeholder {
    color: #4A5568;
}

.input-wrapper input:hover {
    border-color: rgba(255, 255, 255, 0.15);
    background: rgba(0, 0, 0, 0.3);
}

.focus-border {
    position: absolute;
    bottom: -1px;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--intel-cyan), transparent);
    transition: width var(--transition-medium), left var(--transition-medium);
    opacity: 0;
}

.input-wrapper input:focus {
    border-color: rgba(0, 199, 253, 0.4);
    background: rgba(13, 19, 34, 0.6);
    box-shadow: 0 0 0 4px rgba(0, 199, 253, 0.05);
}

.input-wrapper input:focus ~ .focus-border {
    width: 80%;
    left: 10%;
    opacity: 1;
}

.input-wrapper input:focus ~ .icon {
    color: var(--intel-cyan);
}

.password-toggle {
    position: absolute;
    right: 16px;
    background: none;
    border: none;
    color: #5B6A82;
    cursor: pointer;
    font-size: 14px;
    padding: 4px;
    transition: color var(--transition-fast);
}

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

/* Options */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: -4px;
    margin-bottom: 8px;
}

.checkbox-container {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    user-select: none;
    position: relative;
    padding-left: 24px;
    transition: color var(--transition-fast);
}

.checkbox-container:hover {
    color: var(--text-primary);
}

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

.checkmark {
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 16px;
    width: 16px;
    background-color: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.checkbox-container:hover input ~ .checkmark {
    border-color: rgba(255, 255, 255, 0.3);
}

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

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
    left: 5px;
    top: 2px;
    width: 3px;
    height: 7px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

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

.forgot-password {
    font-size: 13px;
    color: var(--intel-cyan);
    text-decoration: none;
    font-weight: 500;
    transition: opacity var(--transition-fast);
}

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

/* Submit Button */
.submit-btn {
    position: relative;
    background: linear-gradient(135deg, var(--intel-blue), var(--intel-dark-blue));
    color: white;
    font-family: inherit;
    font-size: 15px;
    font-weight: 600;
    border: none;
    border-radius: var(--input-radius);
    padding: 14px 24px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    transition: all var(--transition-medium);
    overflow: hidden;
    box-shadow: 0 8px 16px rgba(0, 113, 197, 0.2);
}

.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 {
    transform: translateY(-2px);
    box-shadow: 0 12px 20px rgba(0, 113, 197, 0.3);
    background: linear-gradient(135deg, #0082E6, var(--intel-blue));
}

.submit-btn:hover::before {
    left: 100%;
}

.submit-btn:active {
    transform: translateY(0);
    box-shadow: 0 4px 8px rgba(0, 113, 197, 0.2);
}

.btn-icon {
    font-size: 14px;
    transition: transform var(--transition-medium);
}

.submit-btn:hover .btn-icon {
    transform: translateX(4px);
}

/* Loading State for Button */
.submit-btn.loading .btn-text,
.submit-btn.loading .btn-icon {
    opacity: 0;
}

.loader-spinner {
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 0.8s linear infinite;
    opacity: 0;
    transition: opacity 0.2s;
}

.submit-btn.loading .loader-spinner {
    opacity: 1;
}

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

/* Divider */
.divider {
    position: relative;
    text-align: center;
    margin: 32px 0 24px;
}

.divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--glass-border);
}

.divider span {
    position: relative;
    background: #0d121c; /* matches blurred background approx */
    padding: 0 16px;
    color: #5B6A82;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

/* Social Login */
.social-login {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 32px;
}

.social-btn {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: var(--input-radius);
    padding: 12px 16px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    transition: all var(--transition-medium);
}

.social-btn img {
    width: 18px;
    height: 18px;
}

.social-btn i {
    font-size: 18px;
}

.social-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

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

/* Signup Prompt */
.signup-prompt {
    text-align: center;
    font-size: 14px;
    color: var(--text-secondary);
}

.signup-prompt a {
    color: var(--intel-cyan);
    text-decoration: none;
    font-weight: 500;
    transition: opacity var(--transition-fast);
}

.signup-prompt a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

/* Adjust divider background to blend with glassmorphism */
@supports (backdrop-filter: blur(20px)) {
    .divider span {
        background: transparent;
        text-shadow: 0 0 8px rgba(0,0,0,0.8);
    }
}