:root {
    /* Base Colors - Light Mode */
    --bg-color: #f8f9fa; /* Slightly off-white for modern feel */
    --text-color: #2c3e50;
    --card-bg: #ffffff;
    --card-hover: #f1f3f5;
    --primary-color: #3498db;
    --border-color: #e9ecef;
    --shadow-color: rgba(0, 0, 0, 0.05);
    --header-bg: #ffffff;
    --footer-text: #7f8c8d;
    --toggle-bg: #e9ecef;
    --toggle-text: #2c3e50;
    --input-bg: #ffffff;
    --success-color: #2ecc71; /* Green for success states */
}

body.dark-mode {
    /* Base Colors - Dark Mode */
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --card-bg: #1e1e1e;
    --card-hover: #2c2c2c;
    --primary-color: #5dade2;
    --border-color: #333333;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --header-bg: #1e1e1e;
    --footer-text: #95a5a6;
    --toggle-bg: #2c2c2c;
    --toggle-text: #e0e0e0;
    --input-bg: #1e1e1e;
    --success-color: #4CAF50;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px var(--shadow-color);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-link h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    text-decoration: none;
}

.logo-link {
    text-decoration: none;
    color: inherit;
}

#theme-toggle {
    background-color: var(--toggle-bg);
    color: var(--toggle-text);
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background-color 0.2s;
}

#theme-toggle:hover {
    opacity: 0.8;
}

/* Icon-Only Button Styles */
.icon-btn {
    width: 40px;
    height: 40px;
    padding: 0 !important; /* Remove text padding */
    border-radius: 50% !important; /* Circular */
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--toggle-bg);
    border: none;
    cursor: pointer;
    transition: background-color 0.2s;
}

.icon-btn:hover {
    opacity: 0.8;
}

/* Adjustments specifically for the header buttons */
.header-right {
    display: flex;
    align-items: center;
    gap: 15px; /* Spacing between buttons */
}

/* User Avatar Styling */
.user-profile .avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    cursor: pointer;
    border: 2px solid var(--border-color);
}

/* Ensure Authentication Button (Login) shares the icon style */
.auth-btn.icon-btn {
    background-color: var(--card-bg); /* Or specific color if needed */
    border: 1px solid var(--border-color);
    padding: 0 !important;
}

/* Main Content */
main {
    padding-top: 50px;
    padding-bottom: 60px;
    min-height: calc(100vh - 160px); /* Approx footer/header height */
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 0;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--footer-text);
    font-size: 0.85rem;
}

/* Developer Mode Trigger (Hidden/Stealth) */
.ac-text {
    color: #000000; /* Default Light Mode */
    cursor: default;
    user-select: none;
    font-weight: bold;
    opacity: 0.1; /* Low opacity to keep it stealthy but contrast requirement says visible */
    /* The user asked for "visible and have high contrast", but also "Hidden Developer Mode".
       Usually hidden means low opacity or invisible.
       However, the instruction says:
       "The .ac text must be visible and have high contrast (White in Dark Mode, Black in Light Mode)."
       And "Cursor: default (to keep it hidden/stealthy)".
       I will set opacity to 1 or remove the opacity rule to satisfy "high contrast",
       or keeps it distinct. Let's try opacity 1 to fully satisfy 'high contrast'.
    */
    opacity: 1;
}

body.dark-mode .ac-text {
    color: #ffffff; /* Dark Mode */
}

.hidden {
    display: none !important;
}

/* --- Global Utilities & Components --- */

/* Toast Notification */
#toast {
    visibility: hidden;
    min-width: 250px;
    margin-left: -125px;
    background-color: var(--card-bg);
    color: var(--text-color);
    text-align: center;
    border-radius: 8px;
    padding: 16px;
    position: fixed;
    z-index: 1100;
    left: 50%;
    bottom: 30px;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 12px var(--shadow-color);
}

#toast.show {
    visibility: visible;
    -webkit-animation: fadein 0.5s, fadeout 0.5s 2.5s;
    animation: fadein 0.5s, fadeout 0.5s 2.5s;
}

@-webkit-keyframes fadein {
    from {bottom: 0; opacity: 0;}
    to {bottom: 30px; opacity: 1;}
}

@keyframes fadein {
    from {bottom: 0; opacity: 0;}
    to {bottom: 30px; opacity: 1;}
}

@-webkit-keyframes fadeout {
    from {bottom: 30px; opacity: 1;}
    to {bottom: 0; opacity: 0;}
}

@keyframes fadeout {
    from {bottom: 30px; opacity: 1;}
    to {bottom: 0; opacity: 0;}
}

/* Save Prompt Button */
.save-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    width: 40px;
    height: 40px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    padding: 0; /* Override default padding */
}

.save-btn:hover {
    background-color: var(--card-hover);
    transform: scale(1.05);
}

.save-btn.saved {
    background-color: rgba(46, 204, 113, 0.15);
    color: var(--success-color);
    border-color: var(--success-color);
}

.save-btn svg {
    stroke-width: 2px;
}

/* Auth Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7); /* Semi-transparent black */
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--card-bg);
    color: var(--text-color);
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 4px 20px var(--shadow-color);
    border: 1px solid var(--border-color);
}

.modal-content h3 {
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.benefit-list {
    text-align: left;
    margin-bottom: 25px;
    list-style: none;
    padding-left: 10px;
}

.benefit-list li {
    margin-bottom: 10px;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.google-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    width: 100%;
    font-weight: 600;
    margin-bottom: 10px;
    transition: background-color 0.2s;
}

.google-btn:hover {
    opacity: 0.9;
}

.link-btn {
    background: transparent;
    border: none;
    color: var(--footer-text);
    text-decoration: underline;
    cursor: pointer;
    font-size: 0.9rem;
    margin-top: 5px;
}

.link-btn:hover {
    color: var(--text-color);
}

/* CTA Button Styling (if not already defined) */
.cta-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    margin-top: 15px;
    transition: all 0.2s;
}

.cta-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

/* User Profile & Dropdown */
.user-profile {
    position: relative;
    display: flex;
    align-items: center;
}

.profile-dropdown {
    position: absolute;
    top: 50px;
    right: 0;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 12px var(--shadow-color);
    width: 180px;
    display: flex;
    flex-direction: column;
    padding: 8px 0;
    z-index: 1000;
}

.profile-dropdown.hidden {
    display: none;
}

.dropdown-item,
.logout-btn {
    padding: 10px 16px;
    text-align: left;
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    font-size: 0.95rem;
    transition: background-color 0.2s;
    width: 100%;
    display: block;
}

.dropdown-item:hover,
.logout-btn:hover {
    background-color: var(--card-hover);
}

.logout-btn {
    color: #e74c3c; /* Red for logout */
    border-top: 1px solid var(--border-color);
}

/* Color Swatch Styling */
.dropdown-menu.has-swatches {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 10px;
    max-height: 250px;
    overflow-y: auto;
}

.dropdown-item.color-swatch {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.2);
    cursor: pointer;
    transition: transform 0.2s ease;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    padding: 0; /* Remove default padding */
    display: inline-block; /* Ensure block model for sizing */
    margin: 5px;
}

.dropdown-item.color-swatch:hover,
.dropdown-item.color-swatch.selected {
    transform: scale(1.2);
    border-color: #fff;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}