/* === Modern AI Chat Interface Styles === */

/* --- Global Styles & Variables --- */
:root {
    /* Theme Agnostic */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --border-radius-small: 4px;
    --border-radius-medium: 8px;
    --border-radius-large: 18px; /* For chat bubbles/input */
    --transition-speed: 0.2s;
    --transition-func: ease;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);

    /* Light Theme (Default) */
    --bg-primary: #ffffff;          /* Main background (chat area) */
    --bg-secondary: #f0f2f5;        /* Body background, input field */
    --bg-tertiary: #e4e6eb;         /* AI message bubble, subtle hover */
    --text-primary: #1c1e21;         /* Primary text */
    --text-secondary: #606770;       /* Muted text (timestamps, usage) */
    --text-placeholder: #8a8d91;    /* Input placeholder */
    --border-color: #ced0d4;         /* Borders, dividers */
    --primary-color: #007bff;         /* Main accent (buttons, links, user msg) */
    --primary-hover: #0056b3;         /* Accent hover */
    --primary-text-on: #ffffff;      /* Text on primary color bg */
    --accent-color: #28a745;         /* Success/New chat (Green) */
    --accent-hover: #218838;
    --error-color: #dc3545;          /* Errors/Delete (Red) */
    --error-hover: #c82333;
    --user-msg-bg: var(--primary-color);
    --user-msg-text: var(--primary-text-on);
    --ai-msg-bg: var(--bg-tertiary);
    --ai-msg-text: var(--text-primary);
    --header-bg: var(--bg-primary);
    --header-border: var(--border-color);
    --sidebar-bg: #1f2937;         /* Darker sidebar */
    --sidebar-text: #e5e7eb;
    --sidebar-text-muted: #9ca3af;
    --sidebar-hover-bg: #374151;
    --sidebar-active-bg: var(--primary-color); /* Active chat bg */
    --sidebar-active-text: var(--primary-text-on);
    --scrollbar-thumb: #bdc3c7;
    --scrollbar-track: var(--bg-secondary);
    --progress-bg: var(--bg-tertiary);
    --icon-color: var(--text-secondary);
    --icon-hover-color: var(--text-primary);
    --icon-hover-bg: var(--bg-tertiary);
}

.dark-theme {
    /* Dark Theme Overrides */
    --bg-primary: #18191a;          /* Dark main bg */
    --bg-secondary: #242526;        /* Slightly lighter dark bg */
    --bg-tertiary: #3a3b3c;         /* Darker hover, AI msg bubble */
    --text-primary: #e4e6eb;         /* Light text */
    --text-secondary: #b0b3b8;       /* Muted light text */
    --text-placeholder: #7a7d80;
    --border-color: #3e4042;         /* Dark borders */
    --primary-color: #0a84ff;         /* Brighter blue for dark mode */
    --primary-hover: #0060df;
    /* --primary-text-on: #ffffff; (Often same) */
    --accent-color: #30d158;         /* Brighter green */
    --accent-hover: #29b34a;
    --error-color: #ff453a;          /* Brighter red */
    --error-hover: #ff3025;
    /* --user-msg-bg: var(--primary-color); (Inherits) */
    /* --user-msg-text: var(--primary-text-on); (Inherits) */
    --ai-msg-bg: var(--bg-tertiary);
    --ai-msg-text: var(--text-primary);
    --header-bg: var(--bg-secondary); /* Slightly different header bg */
    --header-border: var(--border-color);
    --sidebar-bg: #111827;         /* Even darker sidebar */
    --sidebar-text: #d1d5db;
    --sidebar-text-muted: #9ca3af;
    --sidebar-hover-bg: #1f2937;
    /* --sidebar-active-bg: var(--primary-color); (Inherits) */
    /* --sidebar-active-text: var(--primary-text-on); (Inherits) */
    --scrollbar-thumb: #555;
    --scrollbar-track: var(--bg-secondary);
    --progress-bg: var(--bg-tertiary);
    --icon-color: var(--text-secondary);
    --icon-hover-color: var(--text-primary);
    --icon-hover-bg: var(--bg-tertiary);
}

/* --- Basic Reset & Body --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: var(--font-main);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.5; /* Slightly tighter line height */
    padding-top: 60px; /* Match header height */
    font-size: 16px; /* Base font size */
    transition: background-color var(--transition-speed) var(--transition-func),
    color var(--transition-speed) var(--transition-func);
    -webkit-font-smoothing: antialiased; /* Improve font rendering */
    -moz-osx-font-smoothing: grayscale;
}

/* --- Header --- */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--header-border);
    box-shadow: var(--shadow-sm);
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: 60px;
    z-index: 1000;
    transition: background-color var(--transition-speed) var(--transition-func),
    border-color var(--transition-speed) var(--transition-func);
}

.header-logo {
    font-size: 1.3rem;
    font-weight: 600; /* Semibold */
    color: var(--text-primary);
    transition: color var(--transition-speed) var(--transition-func);
}
/* Optional: Use primary color for logo?
.header-logo { color: var(--primary-color); }
*/

.header-user-info {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem; /* 14px */
    transition: color var(--transition-speed) var(--transition-func);
}
.header-user-info p { margin: 0; line-height: 1.3; }
.header-user-info strong {
    color: var(--text-primary);
    font-weight: 500;
    transition: color var(--transition-speed) var(--transition-func);
}

.header-buttons { display: flex; align-items: center; gap: 12px; }

.header-btn {
    background-color: var(--primary-color);
    color: var(--primary-text-on);
    border: none;
    border-radius: var(--border-radius-medium);
    padding: 8px 14px;
    cursor: pointer;
    font-size: 0.9rem; /* 14.4px */
    font-weight: 500;
    font-family: var(--font-main);
    transition: background-color var(--transition-speed) var(--transition-func);
    line-height: 1;
}
.header-btn:hover { background-color: var(--primary-hover); }

/* Specific button styling */
#logoutBtn {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
}
#logoutBtn:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}
.dark-theme #logoutBtn { background-color: var(--bg-tertiary); color: var(--text-secondary); }
.dark-theme #logoutBtn:hover { background-color: #4b4d4f; color: var(--text-primary); }


/* Theme Toggle Button */
.header-btn.theme-toggle {
    background-color: transparent;
    color: var(--icon-color);
    font-size: 1.3rem;
    padding: 6px;
    border-radius: 50%; /* Make it circular */
    width: 36px;
    height: 36px;
    display: inline-flex; /* Align icon nicely */
    justify-content: center;
    align-items: center;
}
.header-btn.theme-toggle:hover {
    background-color: var(--icon-hover-bg);
    color: var(--icon-hover-color);
}

/* --- Main Layout Container --- */
.main-container {
    display: flex;
    height: calc(100vh - 60px);
    width: 100%;
}

/* --- Sidebar --- */
.sidebar {
    width: 260px; /* Slightly wider */
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    padding: 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    flex-shrink: 0; /* Prevent shrinking */
    border-right: 1px solid var(--border-color);
    transition: background-color var(--transition-speed) var(--transition-func),
    border-color var(--transition-speed) var(--transition-func);
}

.sidebar h3 {
    margin: 0 0 16px 0;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--sidebar-hover-bg);
    font-size: 0.875rem; /* 14px */
    font-weight: 600;
    color: var(--sidebar-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: color var(--transition-speed) var(--transition-func),
    border-color var(--transition-speed) var(--transition-func);
}

#chatList { flex-grow: 1; overflow-y: auto; margin-right: -8px; padding-right: 8px; } /* Hide scrollbar slightly */

.sidebar-btn {
    color: var(--sidebar-text);
    border: none;
    border-radius: var(--border-radius-medium);
    padding: 10px 12px;
    margin-bottom: 12px;
    cursor: pointer;
    text-align: left;
    width: 100%;
    font-family: var(--font-main);
    font-size: 0.95rem; /* 15.2px */
    font-weight: 500;
    transition: background-color var(--transition-speed) var(--transition-func),
    color var(--transition-speed) var(--transition-func);
}

.new-chat-btn {
    background-color: var(--accent-color);
    color: var(--primary-text-on); /* White text */
}
.new-chat-btn:hover { background-color: var(--accent-hover); }

.chat-session-button-container {
    display: flex;
    align-items: center;
    margin-bottom: 4px;
    border-radius: var(--border-radius-medium);
    transition: background-color var(--transition-speed) var(--transition-func);
    position: relative; /* For potential active indicator */
}
.chat-session-button-container:hover { background-color: var(--sidebar-hover-bg); }

/* Active chat state */
.chat-session-button-container.active {
    background-color: var(--sidebar-active-bg);
}
.chat-session-button-container.active .chat-session-button {
    color: var(--sidebar-active-text);
    font-weight: 600;
}
.chat-session-button-container.active .delete-chat-button {
    color: var(--sidebar-active-text);
    opacity: 0.7;
}
.chat-session-button-container.active .delete-chat-button:hover {
    color: var(--error-color); /* Still allow delete hover color */
    background-color: rgba(255, 255, 255, 0.1); /* Subtle bg on hover */
    opacity: 1;
}


.chat-session-button {
    flex-grow: 1;
    background-color: transparent;
    color: var(--sidebar-text);
    padding: 10px 12px;
    border: none;
    border-radius: var(--border-radius-medium) 0 0 var(--border-radius-medium);
    text-align: left;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 400;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin: 0;
    transition: color var(--transition-speed) var(--transition-func),
    font-weight var(--transition-speed) var(--transition-func);
}
/* No separate hover needed if container handles it */

.delete-chat-button {
    flex-shrink: 0; /* Don't shrink */
    background-color: transparent;
    color: var(--sidebar-text-muted);
    border: none;
    border-radius: 0 var(--border-radius-medium) var(--border-radius-medium) 0;
    padding: 10px;
    margin: 0;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    transition: color var(--transition-speed) var(--transition-func),
    background-color var(--transition-speed) var(--transition-func);
}
.delete-chat-button:hover {
    color: var(--error-color);
    background-color: rgba(220, 53, 69, 0.1); /* Subtle red background */
}
.dark-theme .delete-chat-button:hover {
    background-color: rgba(255, 69, 58, 0.15); /* Dark theme subtle red */
}

/* Custom Scrollbar for Sidebar (WebKit) */
.sidebar::-webkit-scrollbar, #chatList::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-track, #chatList::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb, #chatList::-webkit-scrollbar-thumb {
    background-color: var(--sidebar-hover-bg);
    border-radius: 3px;
}
.sidebar::-webkit-scrollbar-thumb:hover, #chatList::-webkit-scrollbar-thumb:hover {
    background-color: var(--sidebar-text-muted);
}


/* --- Chat Container --- */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
    overflow: hidden;
    transition: background-color var(--transition-speed) var(--transition-func);
}

/* Progress Bar Area */
#progress-main-div {
    padding: 8px 24px; /* More horizontal padding */
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    flex-shrink: 0; /* Prevent shrinking */
    transition: background-color var(--transition-speed) var(--transition-func),
    border-color var(--transition-speed) var(--transition-func);
}
#progress-container {
    background-color: var(--progress-bg);
    height: 8px; /* Thinner bar */
    border-radius: 4px;
    overflow: hidden; /* Ensure bar stays within bounds */
}
#progress-bar {
    background-color: var(--primary-color);
    height: 100%;
    border-radius: 4px;
    transition: width 0.3s ease, background-color var(--transition-speed) var(--transition-func);
}
#usage-text {
    text-align: center;
    margin-top: 4px;
    font-size: 0.75rem; /* 12px */
    color: var(--text-secondary);
    transition: color var(--transition-speed) var(--transition-func);
}

/* Chat Message Display Area */
.chat-box {
    flex-grow: 1;
    padding: 24px; /* More padding */
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px; /* More space between messages */
}

/* Custom Scrollbar Styling (WebKit browsers) */
.chat-box::-webkit-scrollbar { width: 8px; }
.chat-box::-webkit-scrollbar-track { background: var(--scrollbar-track); border-radius: 4px; }
.chat-box::-webkit-scrollbar-thumb {
    background-color: var(--scrollbar-thumb);
    border-radius: 4px;
    border: 2px solid var(--scrollbar-track);
}
.chat-box::-webkit-scrollbar-thumb:hover { background-color: #a8a8a8; }
.dark-theme .chat-box::-webkit-scrollbar-thumb:hover { background-color: #666; }


.chat-message {
    padding: 12px 16px; /* Adjusted padding */
    border-radius: var(--border-radius-large);
    max-width: 70%; /* Slightly narrower max width */
    word-wrap: break-word;
    line-height: 1.45;
    font-size: 0.95rem; /* 15.2px */
    opacity: 0;
    transform: translateY(10px);
    animation: fadeInMessage 0.3s ease forwards;
    transition: background-color var(--transition-speed) var(--transition-func),
    color var(--transition-speed) var(--transition-func);
}

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

.chat-message.user {
    background-color: var(--user-msg-bg);
    color: var(--user-msg-text);
    align-self: flex-end;
    border-bottom-right-radius: var(--border-radius-small); /* Tail effect */
    margin-left: auto;
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.1); /* Subtle shadow */
}

.chat-message.assistant {
    background-color: var(--ai-msg-bg);
    color: var(--ai-msg-text);
    align-self: flex-start;
    border-bottom-left-radius: var(--border-radius-small); /* Tail effect */
    margin-right: auto;
}

/* Markdown Styling */
.chat-message.assistant p { margin-bottom: 0.5em; } /* Spacing for paragraphs */
.chat-message.assistant p:last-child { margin-bottom: 0; }
.chat-message.assistant strong { font-weight: 600; }
.chat-message.assistant a {
    color: var(--primary-color);
    text-decoration: none;
}
.chat-message.assistant a:hover { text-decoration: underline; }

.chat-message.assistant pre {
    background-color: rgba(0, 0, 0, 0.05); /* Subtle code bg */
    padding: 12px;
    border-radius: var(--border-radius-medium);
    overflow-x: auto;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;
    font-size: 0.875em;
    margin: 8px 0;
    line-height: 1.3;
    color: var(--text-primary); /* Ensure readable code text */
}
.dark-theme .chat-message.assistant pre {
    background-color: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.chat-message.assistant code:not(pre code) {
    background-color: rgba(0, 0, 0, 0.05);
    padding: 2px 5px;
    border-radius: var(--border-radius-small);
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;
    font-size: 0.875em;
}
.dark-theme .chat-message.assistant code:not(pre code) {
    background-color: rgba(255, 255, 255, 0.1);
}

/* --- Chat Input Area --- */
.chat-input-container {
    display: flex;
    align-items: flex-end;
    padding: 12px 24px; /* Match chat box padding */
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    gap: 12px;
    flex-shrink: 0; /* Prevent shrinking */
    transition: background-color var(--transition-speed) var(--transition-func),
    border-color var(--transition-speed) var(--transition-func);
}

.chat-input {
    flex-grow: 1;
    padding: 10px 16px; /* Input padding */
    border-radius: var(--border-radius-large);
    border: 1px solid var(--border-color);
    font-size: 1rem; /* 16px */
    font-family: var(--font-main);
    resize: none;
    overflow-y: auto;
    min-height: 42px; /* Based on padding and line-height */
    max-height: 150px; /* Allow more lines */
    line-height: 1.4;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: border-color var(--transition-speed) var(--transition-func),
    box-shadow var(--transition-speed) var(--transition-func),
    background-color var(--transition-speed) var(--transition-func),
    color var(--transition-speed) var(--transition-func);
}
.chat-input::placeholder { color: var(--text-placeholder); }

.chat-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.15); /* Softer focus ring */
}
.dark-theme .chat-input:focus {
    box-shadow: 0 0 0 3px rgba(10, 132, 255, 0.2);
}

.chat-send-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.3rem; /* Slightly larger icon */
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
    transition: background-color var(--transition-speed) var(--transition-func),
    opacity var(--transition-speed) var(--transition-func);
    padding: 0;
    line-height: 1;
}

.chat-send-button:hover:not(:disabled),
.chat-send-button:focus:not(:disabled) {
    background-color: var(--primary-hover);
    outline: none;
}
.chat-send-button:disabled {
    background-color: var(--border-color);
    color: var(--text-secondary);
    cursor: not-allowed;
    opacity: 0.7;
}
.dark-theme .chat-send-button:disabled {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
}

/* --- Alert / Modal Styles (Refined Theming) --- */
.custom-alert, .custom-alert-confirm {
    display: none;
    position: fixed;
    left: 50%;
    transform: translateX(-50%);
    border-radius: var(--border-radius-medium);
    padding: 20px 24px;
    max-width: 420px;
    width: 90%; /* Responsive width */
    z-index: 9999;
    box-shadow: var(--shadow-md);
    font-family: var(--font-main);
    font-size: 1rem;
    animation: slideInFade 0.3s ease-out forwards;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: background-color var(--transition-speed) var(--transition-func),
    border-color var(--transition-speed) var(--transition-func),
    color var(--transition-speed) var(--transition-func);
}
.custom-alert { top: 20px; }
.custom-alert-confirm { top: 25%; }

/* Specific Alert Types */
.custom-alert.success {
    background-color: #d1e7dd; color: #0f5132; border-color: #badbcc;
}
.dark-theme .custom-alert.success {
    background-color: #142e25; color: #75b798; border-color: #1f4032;
}
.custom-alert.error {
    background-color: #f8d7da; color: #842029; border-color: #f5c2c7;
}
.dark-theme .custom-alert.error {
    background-color: #2c181a; color: #ea868f; border-color: #582d31;
}

.alert-content { display: flex; flex-direction: column; align-items: center; text-align: center; }
#alert-message, #alert-message-confirm { margin-bottom: 16px; line-height: 1.4; }

.custom-alert .close-btn,
.custom-alert-confirm button {
    border: none;
    padding: 10px 20px;
    border-radius: var(--border-radius-medium);
    cursor: pointer;
    font-size: 0.95rem;
    font-family: var(--font-main);
    font-weight: 500;
    transition: background-color var(--transition-speed) var(--transition-func),
    opacity var(--transition-speed) var(--transition-func);
    margin-top: 10px;
}

/* Alert Buttons Theming */
.custom-alert .close-btn { background-color: var(--primary-color); color: var(--primary-text-on); }
.custom-alert .close-btn:hover { background-color: var(--primary-hover); }
.custom-alert.success .close-btn { background-color: #0f5132; color: #fff; }
.dark-theme .custom-alert.success .close-btn { background-color: #28a745; color: #fff;}
.custom-alert.error .close-btn { background-color: #842029; color: #fff; }
.dark-theme .custom-alert.error .close-btn { background-color: #dc3545; color: #fff;}

/* Confirmation Modal Buttons */
.custom-alert-confirm #confirm-alert-confirm { background-color: var(--accent-color); color: var(--primary-text-on); margin-right: 8px; }
.custom-alert-confirm #confirm-alert-confirm:hover { background-color: var(--accent-hover); }
.custom-alert-confirm #close-alert-confirm { background-color: var(--error-color); color: var(--primary-text-on); margin-left: 8px; }
.custom-alert-confirm #close-alert-confirm:hover { background-color: var(--error-hover); }

@keyframes slideInFade {
    from { opacity: 0; transform: translate(-50%, -20px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}

/* --- Responsive Design --- */
@media (max-width: 992px) {
    .sidebar { width: 220px; } /* Narrower sidebar */
    .header { padding: 0 16px; }
    #progress-main-div, .chat-box, .chat-input-container { padding-left: 16px; padding-right: 16px; }
}

@media (max-width: 768px) {
    .sidebar {
        /* Example: Hide sidebar completely on mobile */
        /* Add JS to toggle this, perhaps with a burger button in header */
        display: none;
    }
    /* If sidebar is hidden, main container takes full width */
    /* .main-container { width: 100%; } */

    .header-user-info { display: none; }
    .header-logo { font-size: 1.2rem; }
    .chat-message { max-width: 85%; }
}

@media (max-width: 480px) {
    body { padding-top: 56px; font-size: 15px; } /* Adjust for smaller header */
    .header { height: 56px; padding: 0 12px; }
    .header-logo { /* Optionally hide text, show icon? */ }
    .header-buttons { gap: 8px; }
    .header-buttons .header-btn:not(.theme-toggle) { padding: 6px 10px; font-size: 0.85rem; }
    .header-btn.theme-toggle { width: 32px; height: 32px; font-size: 1.1rem; }

    .main-container { height: calc(100vh - 56px); }

    #progress-main-div { padding: 6px 12px; }
    #progress-container { height: 6px; }
    #usage-text { font-size: 0.7rem; }

    .chat-box { padding: 12px; gap: 12px; }
    .chat-message { font-size: 0.9rem; padding: 10px 14px; }

    .chat-input-container { padding: 10px 12px; gap: 8px; }
    .chat-input { padding: 8px 14px; min-height: 38px; font-size: 0.95rem; }
    .chat-send-button { width: 36px; height: 36px; font-size: 1.2rem; }

    .custom-alert, .custom-alert-confirm { padding: 16px; }
    #alert-message, #alert-message-confirm { font-size: 0.95rem; }
    .custom-alert .close-btn, .custom-alert-confirm button { padding: 8px 16px; font-size: 0.9rem; }
}

/* --- Original Form Styles (Themed) --- */
/* Apply theme variables if forms are on the same page */
.container { /* For login/register page context */
    text-align: center;
    max-width: 500px;
    padding: 20px;
    margin: 50px auto;
}
.form-wrapper { display: flex; justify-content: space-around; gap: 20px; }
.form {
    background: var(--bg-primary);
    padding: 24px; /* More padding */
    width: 100%; /* Let wrapper control spacing */
    border-radius: var(--border-radius-medium);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: background-color var(--transition-speed) var(--transition-func),
    border-color var(--transition-speed) var(--transition-func);
}
.form h1, .form h2 {
    color: var(--text-primary);
    transition: color var(--transition-speed) var(--transition-func);
    margin-bottom: 16px;
}
.form input, .form button { /* Target form inputs/buttons */
    width: 100%; /* Full width within form */
    padding: 12px 14px;
    margin-bottom: 16px; /* Spacing */
    border-radius: var(--border-radius-medium);
    border: 1px solid var(--border-color);
    font-size: 1rem;
    font-family: var(--font-main);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: border-color var(--transition-speed) var(--transition-func),
    box-shadow var(--transition-speed) var(--transition-func),
    background-color var(--transition-speed) var(--transition-func),
    color var(--transition-speed) var(--transition-func);
}
.form input:last-of-type { margin-bottom: 20px; } /* More space before button */
.form input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.15);
}
.dark-theme .form input:focus { box-shadow: 0 0 0 3px rgba(10, 132, 255, 0.2); }

.form button {
    background-color: var(--primary-color);
    color: var(--primary-text-on);
    border: none;
    cursor: pointer;
    font-weight: 500;
}
.form button:hover { background-color: var(--primary-hover); }

/* Responsive for forms */
@media (max-width: 600px) {
    .form-wrapper { flex-direction: column; align-items: center; }
    .form { width: 90%; }
}

/* Loading Spinner */
.loading-spinner {
    border: 4px solid var(--bg-tertiary); /* Light grey */
    border-top: 4px solid var(--primary-color); /* Blue */
    border-radius: 50%;
    width: 24px;
    height: 24px;
    animation: spin 1s linear infinite;
    margin: 0 8px; /* Adjust spacing */
    flex-shrink: 0;
}

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