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

:root {
    /* Perqlit Teal-First Minimal Color Palette */
    --discovery-teal: #00BFA6;
    --signal-blue: #1F6FFF;
    --beam-mint: #D2F7F1;
    --sky-mist: #E6F4FF;
    --clean-white: #FFFFFF;
    --charcoal-black: #1C1E21;
    --cool-gray: #6B7280;
    --blue-spark: #3A5DFF;
    --mint-glow: #B9FBC0;
    
    /* Updated theme variables - Teal-First */
    --bg-primary: linear-gradient(135deg, var(--beam-mint) 0%, var(--clean-white) 100%);
    --bg-secondary: var(--clean-white);
    --text-primary: var(--charcoal-black);
    --text-secondary: var(--cool-gray);
    --text-muted: var(--cool-gray);
    --border-color: #e2e8f0;
    --shadow: rgba(28, 30, 33, 0.1);
    --input-bg: var(--clean-white);
    --card-bg: var(--clean-white);
    --divider-bg: var(--clean-white);
    --accent-color: var(--discovery-teal);
    --hover-color: var(--signal-blue);
    --highlight-color: var(--blue-spark);
    --success-color: var(--mint-glow);
    --alternate-bg: var(--sky-mist);
}

[data-theme="dark"] {
    --bg-primary: linear-gradient(135deg, #0f1419 0%, #1a1f2e 100%);
    --bg-secondary: #1a1f2e;
    --text-primary: var(--clean-white);
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #374151;
    --shadow: rgba(0, 0, 0, 0.3);
    --input-bg: #2d3748;
    --card-bg: #2d3748;
    --divider-bg: #1a1f2e;
    --accent-color: var(--discovery-teal);
    --hover-color: var(--signal-blue);
    --highlight-color: var(--blue-spark);
    --success-color: var(--mint-glow);
    --alternate-bg: rgba(31, 111, 255, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--clean-white);
    min-height: 100vh;
    color: var(--text-primary);
    transition: all 0.3s ease;
    margin: 0;
    padding: 0;
    position: relative;
}

[data-theme="dark"] body {
    background: var(--bg-primary);
}

/* Subtle gradient at bottom of page */
body::after {
    content: '';
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 200px;
    background: linear-gradient(to top, 
        rgba(0, 191, 166, 0.15) 0%,     /* discovery-teal - stronger */
        rgba(0, 191, 166, 0.12) 20%,    /* more teal coverage */
        rgba(31, 111, 255, 0.08) 50%,   /* signal-blue */
        rgba(139, 92, 246, 0.05) 75%,   /* violet */
        transparent 100%
    );
    pointer-events: none;
    z-index: 1;
}

/* Dark mode gradient at bottom */
[data-theme="dark"] body::after {
    background: linear-gradient(to top, 
        rgba(0, 191, 166, 0.20) 0%,     /* discovery-teal - stronger in dark */
        rgba(0, 191, 166, 0.16) 20%,    /* more teal coverage */
        rgba(31, 111, 255, 0.12) 50%,   /* signal-blue */
        rgba(139, 92, 246, 0.08) 75%,   /* violet */
        transparent 100%
    );
}

.page-layout {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 10;
}

/* Top Navigation Bar */
.top-nav {
    background: var(--bg-secondary);
    backdrop-filter: blur(10px);
    border-radius: 0 0 20px 20px;
    padding: 1.5rem 2rem;
    box-shadow: 0 10px 30px var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    z-index: 100;
}

/* Gradient overlay for top navigation */
.top-nav::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, 
        transparent 0%,
        rgba(139, 92, 246, 0.03) 25%,   /* violet */
        rgba(31, 111, 255, 0.05) 50%,   /* signal-blue */
        rgba(0, 191, 166, 0.08) 80%,    /* discovery-teal */
        rgba(0, 191, 166, 0.10) 100%    /* discovery-teal stronger */
    );
    border-radius: 0 0 20px 20px;
    pointer-events: none;
    z-index: -1;
}

/* Dark mode gradient for top navigation */
[data-theme="dark"] .top-nav::before {
    background: linear-gradient(to bottom, 
        transparent 0%,
        rgba(139, 92, 246, 0.05) 25%,   /* violet */
        rgba(31, 111, 255, 0.08) 50%,   /* signal-blue */
        rgba(0, 191, 166, 0.12) 80%,    /* discovery-teal */
        rgba(0, 191, 166, 0.15) 100%    /* discovery-teal stronger */
    );
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    width: 72px;
    height: 72px;
    object-fit: contain;
    display: block;
    margin: 0;
}

.brand-title {
    font-size: 3rem;
    color: #1C1E21;
    margin: 0;
    font-weight: 900;
    line-height: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
}

[data-theme="dark"] .brand-title {
    color: #FFFFFF;
}

.page-title {
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.home-btn {
    background: transparent;
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    min-width: 80px;
    height: 38px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.home-btn:hover {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: var(--clean-white);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 191, 166, 0.3);
}

.logout-btn {
    background: transparent;
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    min-width: 80px;
    height: 38px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logout-btn:hover {
    background: #ef4444;
    border-color: #ef4444;
    color: var(--clean-white);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

/* Main Content - Centered */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.container {
    width: 100%;
    max-width: 450px;
}

.auth-card {
    background: var(--bg-secondary);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 20px 40px var(--shadow);
    animation: slideUp 0.6s ease-out;
    transition: all 0.3s ease;
}

.profile-card {
    background: var(--bg-secondary);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 20px 40px var(--shadow);
    width: 100%;
    max-width: 600px;
    animation: slideUp 0.6s ease-out;
    transition: all 0.3s ease;
}

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

header {
    text-align: center;
    margin-bottom: 2rem;
    position: relative;
}

.header-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    margin-bottom: 1rem;
}

.auth-toggles {
    position: absolute;
    top: 0;
    right: 0;
    display: flex;
    gap: 0.5rem;
}

.brand-container {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
}

header h1 {
    font-size: 3rem;
    color: #1C1E21;
    margin-bottom: 0;
    font-weight: 900;
    line-height: 72px;
    height: 72px;
    display: flex;
    align-items: center;
}

.brand-tagline {
    font-size: 0.9rem;
    color: #6B7280;
    font-weight: 400;
    line-height: 1.2;
    margin-top: -8px;
    letter-spacing: 0.5px;
    font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
    text-align: left;
    white-space: nowrap;
}

header p {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.site-logo {
    width: 72px;
    height: 72px;
    object-fit: contain;
    display: block;
    margin: 0;
}

@media (max-width: 480px) {
    .site-logo {
        width: 56px;
        height: 56px;
        margin: 0;
    }
    
    header h1 {
        height: 56px;
        line-height: 56px;
    }
}

.dark-mode-toggle {
    position: absolute;
    top: 0;
    right: 0;
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-muted);
}

.dark-mode-toggle:hover {
    border-color: var(--text-secondary);
    transform: scale(1.1);
    color: var(--text-secondary);
}

.dark-mode-icon {
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

[data-theme="dark"] .dark-mode-icon {
    transform: rotate(180deg);
}

.auth-form {
    margin-bottom: 1.5rem;
}

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

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 1rem 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
    background: var(--input-bg);
    color: var(--text-primary);
}

.form-group input:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group input:invalid {
    border-color: #e53e3e;
}

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

.password-input-container input {
    padding-right: 3rem;
}

.password-toggle {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.password-toggle:hover {
    background: rgba(102, 126, 234, 0.1);
}

.password-toggle:active {
    transform: translateY(-50%) scale(0.95);
}

.eye-icon {
    font-size: 1.1rem;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.password-toggle:hover .eye-icon {
    opacity: 1;
}

.password-toggle.showing .eye-icon {
    opacity: 1;
}

.password-strength {
    margin-top: 0.5rem;
    height: 4px;
    border-radius: 2px;
    background: var(--border-color);
    overflow: hidden;
}

.password-strength::before {
    content: '';
    display: block;
    height: 100%;
    width: 0%;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.password-strength.weak::before {
    width: 25%;
    background: #e53e3e;
}

.password-strength.fair::before {
    width: 50%;
    background: #d69e2e;
}

.password-strength.good::before {
    width: 75%;
    background: #38a169;
}

.password-strength.strong::before {
    width: 100%;
    background: #48bb78;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.form-options-right {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.checkbox-label {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    cursor: pointer;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 32px;
    height: 32px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    margin-right: 0.75rem;
    position: relative;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: #667eea;
    border-color: #667eea;
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 18px;
    font-weight: bold;
}

.checkbox-text {
    flex: 1;
    line-height: 1.4;
    word-wrap: break-word;
}

.forgot-password {
    color: #667eea;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

.forgot-password:hover {
    color: #5a67d8;
}

.clear-credentials {
    color: #718096;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

.clear-credentials:hover {
    color: #e53e3e;
}

.auth-button {
    width: 100%;
    padding: 1.25rem 2rem;
    background: var(--accent-color);
    color: var(--clean-white);
    border: none;
    border-radius: 16px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.25);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.auth-button::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 0.6s ease;
}

.auth-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(0, 191, 166, 0.4);
    background: var(--hover-color);
}

.auth-button:hover::before {
    left: 100%;
}

.auth-button:active {
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(0, 191, 166, 0.3);
}

.auth-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: 0 4px 15px rgba(0, 191, 166, 0.2);
}

.auth-button:disabled:hover {
    transform: none;
    box-shadow: 0 4px 15px rgba(0, 191, 166, 0.2);
}

.auth-divider {
    text-align: center;
    margin: 1.5rem 0;
    position: relative;
}

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

.auth-divider span {
    background: var(--divider-bg);
    padding: 0 1rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.social-auth {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.social-button {
    width: 100%;
    padding: 0.875rem 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--input-bg);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.social-button:hover {
    border-color: var(--text-muted);
    background: var(--card-bg);
    transform: translateY(-1px);
}

.social-button.google::before {
    content: '🔍';
    font-size: 1.1rem;
}

.social-button.apple::before {
    content: '🍎';
    font-size: 1.1rem;
}

.auth-footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.auth-footer a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.auth-footer a:hover {
    color: #5a67d8;
}

.link {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.link:hover {
    color: #5a67d8;
}

/* Error states */
.form-group.error input {
    border-color: #e53e3e;
    box-shadow: 0 0 0 3px rgba(229, 62, 62, 0.1);
}

.error-message {
    color: #e53e3e;
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

.success-message {
    color: #48bb78;
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

/* Success states */
.form-group.success input {
    border-color: #48bb78;
    box-shadow: 0 0 0 3px rgba(72, 187, 120, 0.1);
}

/* Responsive Design */
@media (max-width: 480px) {
    .auth-card {
        padding: 2rem 1.5rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    header h1 {
        font-size: 2.4rem;
        height: 56px;
        line-height: 56px;
    }
    
    .brand-tagline {
        font-size: 0.9rem;
        margin-top: -6px;
    }
    
    .social-auth {
        gap: 0.5rem;
    }
}

/* Loading animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.password-match-indicator {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.95rem;
    min-height: 1.2em;
    font-weight: 500;
    transition: color 0.2s;
}
.password-match-indicator.match {
    color: #38a169; /* green */
}
.password-match-indicator.no-match {
    color: #e53e3e; /* red */
}

/* Dark mode text color for header h1 */
[data-theme="dark"] header h1 {
    color: #FFFFFF;
}

[data-theme="dark"] .brand-tagline {
    color: #9CA3AF;
}

/* Footer styles for page layout */
.footer {
    background: transparent;
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid transparent;
    margin-top: auto;
}

.footer p {
    margin: 0;
    opacity: 0.8;
}

/* Clickable brand elements */
.clickable-brand {
    cursor: pointer;
    transition: all 0.2s ease;
}

.clickable-brand:hover {
    opacity: 0.8;
    transform: scale(1.02);
}

/* Dark mode specific improvements */
[data-theme="dark"] .password-toggle:hover {
    background: rgba(102, 126, 234, 0.15);
}

[data-theme="dark"] .eye-icon {
    filter: invert(1);
}

[data-theme="dark"] .social-button.google::before,
[data-theme="dark"] .social-button.apple::before {
    filter: none;
}

/* Improve dark mode form focus states */
[data-theme="dark"] .form-group input:focus,
[data-theme="dark"] .form-group select:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

[data-theme="dark"] .form-group.error input {
    border-color: #e53e3e;
    box-shadow: 0 0 0 3px rgba(229, 62, 62, 0.2);
}

[data-theme="dark"] .form-group.success input {
    border-color: #48bb78;
    box-shadow: 0 0 0 3px rgba(72, 187, 120, 0.2);
}