:root {
    --bg-main: #f0f0f0;
    --bg-app: #ffffff;
    --text-primary: #333;
    --text-secondary: #666;
    --text-tertiary: #444;
    --text-title: #555;
    --border-color-light: #eee;
    --border-color-medium: #ddd;
    --border-color-strong: #ccc;
    --btn-main-bg: #333;
    --btn-main-text: #fff;
    --btn-main-hover: #555;
    --btn-secondary-bg: #555;
    --btn-secondary-text: #fff;
    --btn-secondary-hover: #333;
    --btn-blocker-bg: #f0f0f0;
    --btn-blocker-text: #444;
    --btn-blocker-hover: #e0e0e0;
    --step-bg: #f9f9f9;
    --validation-bg: #f8f8f8;
    --text-error: #d9534f;
    --text-dim: #999;

    --switch-bg: #ffffff;
    --switch-border: #ddd;
    --switch-handle: #333;
    --switch-icon-sun: #333; 
    --switch-icon-moon: #aaa;
}

body.dark-mode {
    --bg-main: #1a1a1a;
    --bg-app: #2a2a2a;
    --text-primary: #f0f0f0;
    --text-secondary: #aaa;
    --text-tertiary: #f0f0f0;
    --text-title: #ccc;
    --border-color-light: #444;
    --border-color-medium: #555;
    --border-color-strong: #666;
    --btn-main-bg: #f0f0f0;
    --btn-main-text: #333;
    --btn-main-hover: #ccc;
    --btn-secondary-bg: #ccc;
    --btn-secondary-text: #333;
    --btn-secondary-hover: #f0f0f0;
    --btn-blocker-bg: #444;
    --btn-blocker-text: #f0f0f0;
    --btn-blocker-hover: #555;
    --step-bg: #3a3a3a;
    --validation-bg: #3f3f3f;
    --text-error: #ff8a80;
    --text-dim: #777;

    --switch-bg: #3a3a3a;
    --switch-border: #555;
    --switch-handle: #f0f0f0;
    --switch-icon-sun: #888; 
    --switch-icon-moon: #333; 
}

body, h1, p, textarea, button, input {
    margin: 0;
    padding: 0;
    box-sizing: border-box; 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    display: flex; 
    justify-content: center; 
    align-items: center; 
    min-height: 100vh; 
    padding: 20px;
}

.app-container {
    background-color: var(--bg-app);
    width: 90%;
    max-width: 450px; 
    padding: 25px;
    border-radius: 10px; 
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05); 
    text-align: center;
    position: relative; 
}

.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    width: 100%;
    min-height: 40px;
}

.switch-wrapper {
    display: flex;
    align-items: center;
}

.theme-checkbox { display: none; }

.theme-switch {
    display: block;
    width: 60px;
    height: 30px;
    background-color: var(--switch-bg);
    border: 1px solid var(--switch-border);
    border-radius: 15px;
    position: relative;
    cursor: pointer;
    transition: background-color 0.3s, border-color 0.3s;
}

.theme-switch::before {
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    position: absolute;
    width: 24px;
    height: 24px;
    border-radius: 50%; 
    background-color: var(--switch-handle); 
    top: 2px;
    left: 2px;
    transition: transform 0.3s, background-color 0.3s, color 0.3s;
    box-shadow: 0 1px 2px rgba(0,0,0,0.2); 
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    line-height: 1;
}

.theme-switch::after {
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    position: absolute;
    font-size: 1rem;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    transition: opacity 0.3s ease, color 0.3s;
}

.theme-switch::before { content: '\f185'; color: var(--switch-icon-sun); } /* Sun */
.theme-switch::after { content: '\f186'; color: var(--switch-icon-moon); } /* Moon */

#theme-toggle-checkbox:checked + .theme-switch::before {
    transform: translateX(30px);
    content: '\f186'; 
    color: var(--switch-icon-moon);
}
#theme-toggle-checkbox:checked + .theme-switch::after {
    content: '\f185'; 
    left: 6px;
    right: auto;
    color: var(--switch-icon-sun);
}

.theme-switch.mode-switch-style::before { content: '\f1cd' !important; } 
.theme-switch.mode-switch-style::after { content: '\f091' !important; }

#mode-toggle:checked + .theme-switch.mode-switch-style::before {
    transform: translateX(30px);
    content: '\f091' !important; 
}
#mode-toggle:checked + .theme-switch.mode-switch-style::after {
    content: '\f1cd' !important; 
    left: 6px;
    right: auto;
}

.title {
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--text-title);
    margin-top: 0;
    margin-bottom: 10px;
    line-height: 1.2;
}

.mode-info-container {
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color-light);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    min-height: 50px;
}

.mode-status {
    font-size: 0.95rem;
    color: var(--text-primary);
    margin: 0;
}

.mode-description {
    font-size: 0.85rem;
    color: var(--text-secondary);
    max-width: 320px;
    line-height: 1.4;
    margin: 0;
}

.prompt {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 15px;
}
textarea#task-input {
    width: 100%;
    min-height: 100px; 
    border: 1px solid var(--border-color-medium);
    border-radius: 8px;
    padding: 10px;
    font-size: 1rem;
    font-family: inherit;
    resize: vertical; 
    margin-bottom: 20px;
    background-color: var(--bg-app);
    color: var(--text-primary);
}
button#generate-button {
    width: 100%;
    padding: 15px;
    background-color: var(--btn-main-bg);
    color: var(--btn-main-text);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer; 
    transition: background-color 0.2s; 
}
button#generate-button:hover {
    background-color: var(--btn-main-hover);
}
#steps-container { margin-top: 20px; text-align: left; }
.step {
    background-color: var(--step-bg);
    border: 1px solid var(--border-color-light);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 10px;
    display: flex; 
    align-items: center; 
    transition: all 0.3s ease; 
}
.step.hidden { display: none; }
.step label {
    margin-left: 10px;
    font-size: 0.95rem;
    color: var(--text-primary);
    transition: color 0.3s ease; 
}
.step.completed label { text-decoration: line-through; color: var(--text-dim); }
.step input[type="checkbox"] { width: 20px; height: 20px; flex-shrink: 0; accent-color: var(--text-secondary); }
.error { color: var(--text-error); font-weight: 600; }
.blockers-container { display: flex; flex-direction: column; gap: 10px; }
.blocker-button {
    width: 100%; padding: 12px; background-color: var(--btn-blocker-bg); color: var(--btn-blocker-text); 
    font-size: 0.9rem; font-weight: 500; border: 1px solid var(--border-color-medium); border-radius: 8px; 
    cursor: pointer; text-align: left; transition: all 0.2s ease;
}
.blocker-button:hover { background-color: var(--btn-blocker-hover); border-color: var(--border-color-strong); }
.loading-message { font-size: 0.9rem; color: var(--text-secondary); padding: 20px 0; text-align: center; }
.separator-text { text-align: center; color: var(--text-secondary); font-size: 0.9rem; margin: 15px 0 10px; }
#custom-blocker-input {
    width: 100%; border: 1px solid var(--border-color-strong); border-radius: 8px; padding: 12px; 
    font-size: 0.95rem; font-family: inherit; margin-bottom: 10px; box-sizing: border-box; 
    background-color: var(--bg-app); color: var(--text-primary);
}
#custom-blocker-button {
    width: 100%; padding: 12px; background-color: var(--btn-blocker-bg); color: var(--btn-blocker-text); 
    font-size: 0.95rem; font-weight: 600; border: 1px solid var(--border-color-strong); border-radius: 8px; 
    cursor: pointer; transition: background-color 0.2s;
}
#custom-blocker-button:hover { background-color: var(--btn-blocker-hover); }
.ai-validation {
    font-size: 0.95rem; color: var(--text-tertiary); line-height: 1.5; background-color: var(--validation-bg); 
    border: 1px solid var(--border-color-light); border-radius: 8px; padding: 12px; margin-bottom: 15px; text-align: left;
}
.ai-question {
    text-align: left; font-size: 1rem; font-weight: 500; color: var(--text-primary); margin-bottom: 15px; line-height: 1.4;
}
#user-answer-input {
    width: 100%; min-height: 80px; border: 1px solid var(--border-color-medium); border-radius: 8px; padding: 10px; 
    font-size: 0.95rem; font-family: inherit; resize: vertical; margin-bottom: 15px; background-color: var(--bg-app); color: var(--text-primary);
}
#submit-answer-button {
    width: 100%; padding: 12px; background-color: var(--btn-secondary-bg); color: var(--btn-secondary-text); 
    font-size: 0.95rem; font-weight: 600; border: none; border-radius: 8px; cursor: pointer; transition: background-color 0.2s;
}
#submit-answer-button:hover { background-color: var(--btn-secondary-hover); }
.steps-header {
    padding: 10px 15px; background-color: var(--validation-bg); border: 1px solid var(--border-color-light); 
    border-radius: 8px; margin-bottom: 15px; text-align: left;
}
.steps-header .header-title { font-size: 1rem; font-weight: 500; color: var(--text-primary); line-height: 1.4; }
.steps-header .header-title strong { color: var(--btn-main-bg); }
body.dark-mode .steps-header .header-title strong { color: var(--btn-main-bg); }
.steps-header .header-subtitle { font-size: 0.9rem; color: var(--text-secondary); margin-top: 5px; }
.win-message { text-align: center; animation: fadeIn 0.5s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }