@import url(https://rsms.me/inter/inter.css);
/* Minimalist functional styling */
body {
    font-family: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    transition: background-color 0.3s, color 0.3s;
}

:root {
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,'Open Sans', 'Helvetica Neue', sans-serif;
    --bg-main: #fff;
    --bg-content: #ffffff;
    --bg-hover: #fafafa;
    --bg-subtle: #f4f4f5;
    --text-primary: #18181b;
    --text-secondary: #71717a;
    --text-on-accent: #ffffff;
    --border-color: #e4e4e7;
    --accent-color: #002FA7;
    --accent-color-hover: #002fa7ef ;
    --danger-color: #ef4444;
    --danger-bg: #fef2f2;
    --danger-border: #fecaca;
    --danger-bg-hover: #fee2e2;
    --success-color: #22c55e;
    --success-bg: #f0fdf4;
    --success-border: #bbf7d0;
    --success-bg-hover: #dcfce7;
    --kbd-bg: #eeeeee;
    --kbd-border: #b4b4b4;
    --kbd-text: #333333;
    --radius: 8px;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

body.dark-mode {
    --bg-main: #18181b;
    --bg-content: #27272a;
    --bg-hover: #3f3f46;
    --bg-subtle: #3f3f46;
    --text-primary: #f4f4f5;
    --text-secondary: #a1a1aa;
    --text-on-accent: #ffffff;
    --border-color: #3f3f46;
    --accent-color: #60a5fa;
    --accent-color-hover: #93c5fd;
    --danger-color: #f87171;
    --danger-bg: #450a0a;
    --danger-border: #7f1d1d;
    --danger-bg-hover: #521212;
    --success-color: #4ade80;
    --success-bg: #14532d;
    --success-border: #166534;
    --success-bg-hover: #155e34;
    --kbd-bg: #4f4f52;
    --kbd-border: #6e6e71;
    --kbd-text: #f4f4f5;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.2), 0 2px 4px -2px rgb(0 0 0 / 0.2);
}


/* --- Main Layout & Header --- */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1rem;
}
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    /* padding-top: 1.5rem; */
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    /* position: sticky; */
    /* top: 0; */
    /* background-color: var(--bg-main); */
    /* z-index: 10; */
    /* transition: box-shadow 0.3s; */
}


 .lucide{
    width: 18px;
 }
/* header.scrolled {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
} */

body.dark-mode header.scrolled {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.logo{
    letter-spacing: -1.88px;
}

h1 {
    font-weight: 500;
    font-size: 1.75rem;
}
.header-actions { display: flex; align-items: center; gap: 0.75rem; }
.header-actions button, .header-actions a {
    background-color: var(--bg-content);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 8px 14px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
    color: var(--text-primary); /* Ensures text color adapts to theme */
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.header-actions button:hover, .header-actions a:hover {
    background-color: var(--bg-hover);
    border-color: var(--border-color);
}
.header-actions button.primary-action {
    background-color: var(--accent-color);
    color: var(--text-on-accent);
    border-color: var(--accent-color);
}
.header-actions button.primary-action:hover {
    background-color: var(--accent-color-hover);
}
.counter-badge {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    background-color: var(--bg-subtle);
    padding: 4px 10px;
    border-radius: 12px;
    margin-left: 0.75rem;
    vertical-align: middle;
}

/* --- Question List Styles --- */
summary { display: flex; align-items: center; padding: 0.75rem 0.25rem; cursor: pointer; list-style: none; font-weight: 500; }
summary::-webkit-details-marker { display: none; }
summary::before { content: '▶'; font-size: 0.8em; margin-right: 0.75rem; color: var(--text-secondary); transform-origin: center; transition: transform 0.2s ease; }
details[open] > summary::before { transform: rotate(90deg); }
.editable { padding: 4px 6px; min-height: 1.5em; line-height: 1.6; width: 100%; border-radius: 6px; }
.editable[contenteditable="false"] { cursor: default; }
.edit-mode .editable[contenteditable="true"]:focus { 
    outline: 2px solid var(--accent-color); 
    background-color: var(--bg-hover); 
}
.editable[data-placeholder]:empty:before { 
    content: attr(data-placeholder); 
    color: var(--text-secondary);
}
.answer-wrapper { padding: 0.25rem 0 1rem 2.5rem; color: var(--text-secondary); }
.delete-btn { 
    margin-left: auto; 
    cursor: pointer; 
    border: none; 
    background: none; 
    color: var(--text-secondary); 
    line-height: 1; 
    padding: 4px;
    border-radius: 50%;
}
.delete-btn:hover { color: var(--danger-color); background-color: var(--danger-bg); }
#importFileInput { display: none; }

/* --- Dropdown Menu Styles --- */
.dropdown { position: relative; display: inline-block; }
.dropdown-content { display: none; position: absolute; right: 0; background-color: var(--bg-content); min-width: 180px; box-shadow: var(--shadow); border: 1px solid var(--border-color); border-radius: var(--radius); z-index: 10; padding: 0.5rem 0; }
.dropdown-content a { color: var(--text-primary); padding: 10px 16px; text-decoration: none; display: block; font-size: 0.9rem; }
.dropdown-content a:hover { background-color: var(--bg-hover); }
.dropdown-content hr { border: none; border-top: 1px solid var(--border-color); margin: 0.5rem 0; }
.dropdown-content a.danger-link { color: var(--danger-color); }
.dropdown.active .dropdown-content { display: block; }
#menuBtn { padding: 8px; line-height: 1; }

/* --- MODE SWITCHING STYLES --- */
.hidden { display: none !important; }
.edit-only, .study-only { display: none; }
.study-mode .study-only, .edit-mode .edit-only { display: inline-flex; }
.delete-btn { visibility: hidden; }
.edit-mode details:hover .delete-btn { visibility: visible; }
#quizView { display: none; }
.quiz-mode .header-actions, .quiz-mode #questionListContainer, .quiz-mode #helpBtn { display: none; }
.quiz-mode #quizView { display: flex; flex-direction: column; align-items: center; }
.quiz-mode h1 { margin-right: auto; }

/* --- Floating Help Button --- */
#helpBtn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background-color: var(--accent-color);
    color: var(--text-on-accent);
    border: none;
    font-size: 1.5rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: var(--shadow);
    z-index: 99;
    transition: transform 0.2s ease, background-color 0.3s;
    display: flex;
    justify-content: center;
    align-items: center;
}
#helpBtn:hover {
    transform: scale(1.1);
    background-color: var(--accent-color-hover);
}

/* --- Help Modal Styles --- */
.modal-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}
.modal-content {
    background-color: var(--bg-content);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    max-width: 600px;
    width: 90%;
    position: relative;
    max-height: 80vh;
    overflow-y: auto;
}
.close-btn {
    position: absolute;
    top: 1rem; right: 1rem;
    background: none; border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}
#modalBody h2 { margin-top: 0; }
#modalBody h3 { margin-top: 1.5rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.5rem; }
#modalBody p, #modalBody li { line-height: 1.6; color: var(--text-secondary); }
#modalBody kbd {
    background-color: var(--kbd-bg);
    border-radius: 3px;
    border: 1px solid var(--kbd-border);
    color: var(--kbd-text);
    padding: 2px 4px;
    font-family: monospace;
}

/* --- Quiz View Styles --- */
#quizCard { width: 100%; min-height: 300px; background-color: var(--bg-content); border: 1px solid var(--border-color); border-radius: 12px; padding: 2rem 2.5rem; margin-bottom: 1.5rem; display: flex; flex-direction: column; justify-content: center; box-shadow: var(--shadow); }
.progress-bar { width: 100%; height: 8px; background-color: var(--border-color); border-radius: 4px; margin-bottom: 2rem; overflow: hidden; }
#progressBarFill { width: 0%; height: 100%; background-color: var(--accent-color); border-radius: 4px; transition: width 0.3s ease-in-out; }
#quizQuestion { font-size: 1.75rem; font-weight: 600; text-align: center; margin-bottom: 1.5rem; min-height: 80px; }
#quizAnswer { font-size: 1.1rem; text-align: center; line-height: 1.6; color: var(--text-primary); border-top: 1px solid var(--border-color); padding-top: 1.5rem; margin-top: 1.5rem; }
#quizControls { display: flex; align-items: center; gap: 1rem; }
#quizControls button { font-size: 1rem; padding: 0.75rem 1.5rem; border-radius: var(--radius); border: 1px solid var(--border-color); cursor: pointer; transition: all 0.2s ease; }
#showAnswerBtn { 
    background-color: var(--accent-color); 
    color: var(--text-on-accent); 
    border-color: var(--accent-color); 
}
#showAnswerBtn:hover { background-color: var(--accent-color-hover); }
#assessmentBtns { display: flex; gap: 1rem; }
#reviewBtn { 
    background-color: var(--danger-bg); 
    color: var(--danger-color); 
    border-color: var(--danger-border); 
}
#reviewBtn:hover { 
    background-color: var(--danger-bg-hover); 
}
#knewItBtn { 
    background-color: var(--success-bg); 
    color: var(--success-color); 
    border-color: var(--success-border); 
}
#knewItBtn:hover { 
    background-color: var(--success-bg-hover); 
}
#exitQuizBtn { background: none; border: none; color: var(--text-secondary); text-decoration: underline; }

/* NEW: Shake animation for validation */
@keyframes shake {
  10%, 90% { transform: translateX(-1px); }
  20%, 80% { transform: translateX(2px); }
  30%, 50%, 70% { transform: translateX(-4px); }
  40%, 60% { transform: translateX(4px); }
}
.shake {
    animation: shake 0.5s ease-in-out;
}

/* --- Responsive Styles --- */
@media (max-width: 768px) {
    body { padding: 0; }
    .container { margin: 0; padding: 1rem; max-width: 100%; }
    header { flex-direction: column; align-items: flex-start; gap: 1rem; }
    h1 { font-size: 1.5rem; }
    .header-actions { width: 100%; justify-content: flex-start; flex-wrap: wrap; }
    .answer-wrapper { padding: 0.5rem 0 0.5rem 2rem; }
    #quizCard { padding: 1.5rem; }
    #quizQuestion { font-size: 1.3rem; min-height: 60px; }
    #quizControls { flex-direction: column; width: 100%; }
    #quizControls button, #assessmentBtns { width: 100%; display: flex; justify-content: center; }
    #helpBtn { bottom: 1rem; right: 1rem; }
}
  
.credits {
    color: var(--text-secondary);
    font-size: 12px;
    background-color: var(--bg-content);
    width: max-content;
    padding: 4px 8px;
    border-radius: 6px;
    position: fixed; /* fixed to the viewport */
    bottom: 10px;    /* distance from bottom */
   left: 10px;     /* distance from right (or use left: 10px if you prefer) */
    overflow: hidden;
    border: 1px solid var(--border-color);
    z-index: 9999;   /* make sure it stays on top */
}


.credits a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    transition: color 0.3s ease;
}

.credits a:hover {
    color: var(--accent-color-hover);
}

/* --- Theme Switch Styles --- */
.theme-switch-wrapper {
    display: flex;
    align-items: center;
}
.theme-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
    cursor: pointer;
}
.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}
.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    transition: .4s;
    border-radius: 26px;
}
.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 4px;
    bottom: 4px;
    background-color: var(--bg-content);
    transition: .4s;
    border-radius: 50%;
}
input:checked + .slider {
    background-color: var(--accent-color);
}
input:checked + .slider:before {
    transform: translateX(24px);
}