/* ===== Base Styles & Variables ===== */
:root {
    /* Light Theme Colors (Default) */
    --primary-color: #1a73e8;
    --primary-hover: #1557b0;
    --primary-light: #e8f0fe;
    --secondary-color: #f1f3f4;
    --success-color: #34a853;
    --error-color: #ea4335;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --border-color: #dadce0;
    --background: #ffffff;
    --surface: #f8f9fa;
    
    /* Elevation Shadows */
    --elevation-1: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
    --elevation-2: 0 1px 2px 0 rgba(60, 64, 67, 0.2), 0 2px 6px 2px rgba(60, 64, 67, 0.15);
    --elevation-3: 0 1px 3px 0 rgba(60, 64, 67, 0.3), 0 4px 8px 3px rgba(60, 64, 67, 0.15);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Shadows */
    --shadow-sm: var(--elevation-1);
    --shadow-md: var(--elevation-2);
    --shadow-lg: var(--elevation-3);
}

/* ===== Base Reset & Typography ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Google Sans', 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--background);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    margin-bottom: var(--spacing-md);
}

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ===== Layout ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== Header & Navigation ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--background);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    max-width: 1440px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
}

.logo i {
    color: var(--primary-color);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    cursor: pointer;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    position: relative;
    overflow: hidden;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Primary Button */
.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    transition: all var(--transition-fast);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

.btn-primary:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.3);
}

/* Google Sign-In Button */
.btn-google {
    background-color: white;
    color: #3c4043;
    border: 1px solid #dadce0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.btn-google:hover {
    background-color: #f8f9fa;
    border-color: #d2e3fc;
    transform: translateY(-1px);
    box-shadow: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
}

.btn-google:active {
    background-color: #f1f3f4;
    transform: translateY(0);
    box-shadow: none;
}

.btn-google:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.2);
}

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

/* ===== Main Content ===== */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
}

.search-container {
    width: 100%;
    max-width: 584px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.logo-large {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    color: var(--primary-color);
}

.tagline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* ===== Search Form ===== */
.search-form {
    width: 100%;
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.search-input {
    width: 100%;
    padding: 0.9375rem 1.25rem 0.9375rem 3.5rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background-color: var(--background);
    color: var(--text-primary);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.2);
}

.search-icon {
    position: absolute;
    left: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
}

.search-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

/* ===== Modal ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal) cubic-bezier(0.16, 1, 0.3, 1);
    padding: 1rem;
    box-sizing: border-box;
    backdrop-filter: blur(2px);
}

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

.modal-content {
    background: var(--background);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 28rem;
    padding: var(--spacing-xl);
    transform: translateY(20px);
    transition: all var(--transition-normal) cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow-y: auto;
    max-height: 90vh;
    border: 1px solid var(--border-color);
}

.modal.active .modal-content {
    transform: translateY(0);
}

.modal-header {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

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

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--text-primary);
}

/* Form Styles */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.9375rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    background-color: var(--background);
    color: var(--text-primary);
    transition: all var(--transition-fast);
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15);
    background-color: var(--background);
}

/* Divider */
.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: var(--spacing-lg) 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.divider:not(:empty)::before {
    margin-right: 1.25rem;
}

.divider:not(:empty)::after {
    margin-left: 1.25rem;
}

/* User Profile */
.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast);
    cursor: pointer;
    position: relative;
}

.user-profile:hover {
    background-color: rgba(0, 0, 0, 0.03);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.875rem;
    overflow: hidden;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-name {
    font-weight: 500;
    font-size: 0.9375rem;
    color: var(--text-primary);
}

.user-email {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

/* Dropdown Menu */
.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-fast);
    z-index: 100;
    padding: var(--spacing-xs) 0;
}

.dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.625rem var(--spacing-md);
    color: var(--text-primary);
    text-decoration: none;
    transition: background-color var(--transition-fast);
}

.dropdown-item:hover {
    background-color: var(--surface);
}

.dropdown-item i {
    width: 20px;
    color: var(--text-secondary);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 1100;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-width: 24rem;
    width: 100%;
}

.toast {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    background: var(--background);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    transform: translateX(120%);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    opacity: 0;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(4px);
}

.toast::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--primary-color);
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast.hide {
    transform: translateX(120%);
    opacity: 0;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--error-color);
}

.toast-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
    margin-top: 0.125rem;
}

.toast-content {
    flex: 1;
    font-size: 0.9375rem;
    line-height: 1.5;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    margin: -0.5rem -0.5rem -0.5rem 0.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    opacity: 0.7;
}

.toast-close:hover {
    background: rgba(0, 0, 0, 0.05);
    opacity: 1;
}

.toast-close:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(26, 115, 232, 0.2);
}

/* ===== Dark Mode Support ===== */
/* Dark mode overrides - more subtle than default */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #e8eaed;
        --text-secondary: #9aa0a6;
        --border-color: #5f6368;
        --background: #1f1f1f;
        --surface: #2d2d2d;
        --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.2), 0 1px 3px 1px rgba(0, 0, 0, 0.1);
        --shadow-md: 0 2px 6px 2px rgba(0, 0, 0, 0.2);
        --shadow-lg: 0 4px 8px 3px rgba(0, 0, 0, 0.15), 0 1px 3px 1px rgba(0, 0, 0, 0.3);
    }

    body {
        background-color: var(--background);
        color: var(--text-primary);
    }

    .navbar {
        background: rgba(32, 33, 36, 0.9);
        border-bottom: 1px solid rgba(95, 99, 104, 0.2);
    }

    .modal-content {
        background: var(--surface);
        border: 1px solid var(--border-color);
    }

    .form-control {
        background-color: rgba(255, 255, 255, 0.05);
        border-color: var(--border-color);
        color: var(--text-primary);
    }

    .form-control:focus {
        background-color: rgba(255, 255, 255, 0.07);
    }

    .btn-google {
        background-color: #3c4043;
        color: #e8eaed;
        border-color: #5f6368;
    }

    .btn-google:hover {
        background-color: #424548;
        border-color: #5f6368;
    }
}

/* ===== Responsive Styles ===== */
@media (max-width: 768px) {
    .logo {
        font-size: 1.25rem;
    }
    
    .logo-large {
        font-size: 2.5rem;
    }
    
    .tagline {
        font-size: 1.1rem;
    }
    
    .search-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .btn {
        width: 100%;
    }
}

/* Animation Keyframes */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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