/* --- CSS Variables: Romantic & Loving Theme --- */
:root {
    /* Default: Dark Theme (Starry Romantic Night) */
    --bg-gradient: linear-gradient(135deg, #2B0A28, #1C0F1F, #0B0510); 
    /* dark wine → plum → black velvet */
    --bg-main: #150815; /* intimate night backdrop */
    --font-primary: 'Poppins', sans-serif;
    --text-color: #FFE6F0; /* soft rosy white */
    --text-color-muted: #C9AFC9; /* muted lilac */
    --glass-bg: rgba(19, 4, 18, 0.94); /* translucent wine red */
    --glass-border: rgba(255, 182, 193, 0.25);
    --glow-color: #FF5C8A; /* glowing rose pink */
    --glow-shadow: 0 0 18px rgba(255, 92, 138, 0.7),
                   0 0 6px rgba(255, 92, 138, 0.9) inset;
    --error-color: #FF4D6D; /* passionate red-pink */
    --success-color: #FFD97D; /* warm golden joy */
    --border-radius: 1.5rem;
    --transition-speed: 0.4s;
    --shadow-color: rgba(0, 0, 0, 0.6);
    --input-bg: rgba(255, 192, 203, 0.07); /* pink-tinted input */
    --note-item-bg: rgba(255, 192, 203, 0.08);
    --border-col: 1px solid rgba(255, 182, 193, 0.35);
}

[data-theme="light"] {
    /* Light Theme (Dreamy Romantic Morning) */
    --bg-gradient: linear-gradient(135deg, #FFD6E8, #FFEACB, #D6F8FF); 
    /* cotton candy pink → peach → baby blue */
    --bg-main: #FFF0F5; /* lavender blush */
    --text-color: #4B1E2F; /* deep wine text */
    --text-color-muted: #8A5A6A; /* mauve gray */
    --glass-bg: rgba(255, 255, 255, 0.938);
    --glass-border: rgba(255, 126, 163, 0.25);
    --shadow-color: rgba(255, 182, 193, 0.3);
    --input-bg: rgba(255, 240, 245, 0.9); /* soft blush */
    --note-item-bg: rgba(255, 228, 235, 0.85);
    --border-col: 1px solid rgba(255, 105, 180, 0.25);
    --glow-color: #FF5C8A; /* rose pink glow */
    --glow-shadow: 0 0 14px rgba(255, 92, 138, 0.55),
                   0 0 6px rgba(255, 92, 138, 0.75) inset;
    --error-color: #FF4D6D;
    --success-color: #FFD166; /* soft sunshine yellow */
}



/* --- Base Styles --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font-primary); background: var(--bg-gradient); color: var(--text-color); line-height: 1.6; overflow-x: hidden; transition: background var(--transition-speed), color var(--transition-speed); 
    -webkit-user-select: none; /* Safari */
    -ms-user-select: none; /* IE 10 and IE 11 */
    user-select: none; /* Standard syntax */}
#app { min-height: 100vh; }
/* --- Prevent Image Dragging --- */
img { pointer-events: none; user-select: none; -webkit-user-drag: none; }
/* --- Animations --- */
@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.fade-in-item { animation: fadeIn 0.5s ease-out forwards; opacity: 0; }

/* --- Main App Shell & Navigation --- */
.app-shell { width: 100%; min-height: 100vh; display: flex; flex-direction: column; }
.app-header {
    background: var(--glass-bg);
    border-bottom: 1px solid var(--glass-border);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 50;
    transition: background var(--transition-speed), top 0.3s, bottom 0.3s, border-radius 0.3s, width 0.3s, margin 0.3s;
}
.app-nav {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 1.5rem;
}
.nav-link { text-decoration: none; color: var(--text-color-muted); font-weight: 600; position: relative; padding: 0.5rem; display: flex; align-items: center; gap: 0.5rem; transition: color 0.3s; }
.nav-link:hover { color: var(--text-color); }
.nav-link.active { color: var(--glow-color); }
.nav-link.active::after { content: ''; position: absolute; bottom: -1rem; left: 0; width: 100%; height: 3px; background-color: var(--glow-color); border-radius: 2px; }
.header-actions { display: flex; align-items: center; gap: 1rem; }
.app-main { flex-grow: 1; padding: 2rem; background-color: var(--bg-main); transition: background-color var(--transition-speed); }

/* --- Grids (Notes & Memories) --- */
.notes-header, .favorites-container h2 {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    font-weight: 600;
}
.favorites-container h2 {
    gap: 0.75rem;
}

.notes-grid, .image-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.5rem; }
.image-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
.note-item, .memory-item { background: var(--note-item-bg); border: 1px solid var(--glass-border); border-radius: 1rem; cursor: pointer; transition: all 0.3s ease; display: flex; flex-direction: column; box-shadow: 0 4px 20px rgba(0,0,0,0.1); }
.note-item:hover, .memory-item:hover { transform: translateY(-5px); box-shadow: var(--glow-shadow); border-color: var(--glow-color); }
.note-item { 
    padding: 1.5rem;
    position: relative;
}
.edit-note-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    font-size: 1rem;
    z-index: 5;
}
.note-item h4 { font-weight: 600; margin-bottom: 0.5rem; color: var(--text-color); }
.note-item .note-date { font-size: 0.8rem; color: var(--text-color-muted); margin-bottom: 1rem; }
.note-item .note-preview { font-size: 0.9rem; color: var(--text-color); opacity: 0.8; flex-grow: 1; line-height: 1.5; -webkit-box-orient: vertical; display: -webkit-box; -webkit-line-clamp: 4; overflow: hidden; text-overflow: ellipsis; }
.memories-grid { display: flex; flex-direction: column; gap: 2rem; }
.date-group h3 { padding-bottom: 0.5rem; margin-bottom: 1rem; border-bottom: 1px solid var(--glass-border); color: var(--text-color-muted); font-weight: 600; }
.memory-item { padding: 0; position: relative; overflow: hidden; aspect-ratio: 1 / 1; }
.memory-item img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease, filter 0.4s ease; }
.memory-item:hover img { transform: scale(1.1); filter: brightness(0.8); }
.memory-item .overlay { position: absolute; bottom: 0; left: 0; right: 0; background: linear-gradient(to top, rgba(0,0,0,0.8), transparent); color: white; padding: 2rem 1rem 1rem; transform: translateY(100%); transition: transform 0.4s ease; }
.memory-item:hover .overlay { transform: translateY(0); }
.memory-item .overlay h4 { font-size: 1rem; font-weight: 600; }

/* --- Favorite Button (NEW) --- */
.favorite-btn {
    position: absolute;
    top: 1rem;
    left: 1rem;
    z-index: 10;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.7);
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
    transition: color 0.3s ease, transform 0.3s ease;
}
.favorite-btn:hover {
    transform: scale(1.2);
}
.favorite-btn.is-favorite {
    color: var(--error-color);
}
.favorite-btn i {
    -webkit-text-stroke: 1px var(--bg-main);
}
.favorite-btn.is-favorite i {
    -webkit-text-stroke: 0;
}


/* --- Floating Action Button (FAB) --- */
.fab { position: fixed; bottom: 2rem; right: 2rem; width: 60px; height: 60px; background-color: var(--glow-color); color: white; border: none; border-radius: 50%; font-size: 1.5rem; display: flex; justify-content: center; align-items: center; box-shadow: 0 4px 20px rgba(0, 191, 255, 0.4); cursor: pointer; transition: all 0.3s ease; z-index: 99; }
.fab:hover { transform: scale(1.1) rotate(90deg); box-shadow: 0 6px 25px rgba(0, 191, 255, 0.6); }

/* --- Modals (General & Custom Confirm) --- */
.modal-backdrop { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0, 0, 0, 0.5); backdrop-filter: blur(10px); z-index: 100; display: flex; justify-content: center; align-items: center; opacity: 0; visibility: hidden; transition: opacity 0.3s ease, visibility 0.3s ease; }
.modal-backdrop.visible { opacity: 1; visibility: visible; }
.modal-content { background: var(--glass-bg); border: 1px solid var(--glass-border); border-radius: var(--border-radius); padding: 2.5rem; width: 90%; max-width: 600px; box-shadow: 0 0 30px var(--shadow-color), var(--glow-shadow); transform: scale(0.95); transition: transform 0.3s ease; }
.modal-backdrop.visible .modal-content { transform: scale(1); }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; }
.modal-header h2 { margin: 0; display: flex; align-items: center; gap: 0.75rem; padding: 6px 0;border-bottom: var(--border-col);}
.close-button { background: none; border: none; color: var(--text-color-muted); font-size: 2rem; cursor: pointer; line-height: 1; transition: color 0.3s; }
.close-button:hover { color: var(--text-color); }
.modal-footer { display: flex; gap: 1rem; justify-content: flex-end; margin-top: 1.5rem; }
.confirm-modal .modal-content { max-width: 450px; text-align: center; }
.confirm-modal p { font-size: 1.2rem; margin-bottom: 2rem; color: var(--text-color); }
.confirm-modal .modal-footer { justify-content: center; }

/* --- Note Read Modal --- */
.note-read-modal-content .note-date {
    font-size: 0.9rem;
    color: var(--text-color-muted);
    margin-bottom: 1.5rem;
}
.note-read-modal-content .note-content-display {
    background: var(--input-bg);
    padding: 1.5rem;
    border-radius: 1rem;
    border: 1px solid var(--glass-border);
    max-height: 60vh;
    overflow-y: auto;
    white-space: pre-wrap; /* Preserves line breaks */
    line-height: 1.7;
    color: var(--text-color);
}
.note-read-modal-content .modal-footer {
    justify-content: flex-end;
}


/* Memory Detail Modal */
.memory-detail-content { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; align-items: start; }
.memory-detail-image { width: 100%; border-radius: 1rem; background-color: var(--input-bg); }
.memory-detail-info {
  border-left: var(--border-col);
  padding: 25px;
  height: 100%;
}
.memory-detail-image img { width: 100%; height: auto; display: block; border-radius: 1rem; max-height: 70vh; object-fit: contain; }
.memory-detail-info h3 { font-weight: 600; font-size: 1.5rem; color: var(--text-color); margin-bottom: 0.5rem; }
.memory-detail-info .meta-date { font-size: 0.9rem; color: var(--text-color-muted); margin-bottom: 1.5rem; display: block; }
.memory-detail-info p { line-height: 1.7; color: var(--text-color); opacity: 0.9; }

/* --- Forms, Buttons, and other UI elements --- */
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.5rem; color: var(--text-color-muted); font-size: 0.9rem; }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 0.8rem 1rem; background: var(--input-bg); border: 1px solid var(--glass-border); border-radius: 0.5rem; color: var(--text-color); font-family: var(--font-primary); font-size: 1rem; transition: all 0.3s ease; }
.form-group textarea { resize: vertical; min-height: 150px; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: var(--glow-color); box-shadow: 0 0 10px rgba(0, 191, 255, 0.4); }
.btn { width: auto; padding: 0.8rem 2rem; font-family: var(--font-primary); font-size: 1rem; font-weight: 600; color: #fff; background-color: var(--glow-color); border: none; border-radius: 0.75rem; cursor: pointer; transition: all var(--transition-speed) ease; letter-spacing: 1px; display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; }
.btn:hover, .btn:focus { transform: translateY(-2px); box-shadow: 0 0 20px var(--glow-color); }
.btn-danger { background-color: var(--error-color); }
.btn-danger:hover { box-shadow: 0 0 20px var(--error-color); }
.icon-btn { background: none; border: none; color: var(--text-color-muted); font-size: 1rem; cursor: pointer; transition: color 0.3s; }
.icon-btn:hover { color: var(--glow-color); }
.btn-small { padding: 0.5rem 1rem; font-size: 0.9rem; border-radius: 0.5rem; }

/* Settings Page & Theme Toggle */
.settings-container { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 2rem; }
.settings-card { background: var(--glass-bg); border: 1px solid var(--glass-border); border-radius: var(--border-radius); padding: 2.5rem; backdrop-filter: blur(10px); box-shadow: 0 8px 32px 0 var(--shadow-color); transition: border-color 0.3s, box-shadow 0.3s, background 0.3s; }
.settings-card:hover { border-color: var(--glow-color); box-shadow: var(--glow-shadow); }
.settings-card h3 { margin-bottom: 1.5rem; font-weight: 600; color: var(--text-color); display: flex; align-items: center; gap: 0.75rem; }
.theme-toggle { display: flex; justify-content: space-between; align-items: center; }
.switch { position: relative; display: inline-block; width: 60px; height: 34px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #ccc; transition: .4s; border-radius: 34px; }
.slider:before { position: absolute; content: ""; height: 26px; width: 26px; left: 4px; bottom: 4px; background-color: white; transition: .4s; border-radius: 50%; }
input:checked + .slider { background-color: var(--glow-color); }
input:checked + .slider:before { transform: translateX(26px); }

/* Other Styles (Loader, Toast, Login) */
.loader { border: 4px solid var(--glass-border); border-top: 4px solid var(--glow-color); border-radius: 50%; width: 40px; height: 40px; animation: spin 1s linear infinite; margin: 2rem auto; }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
#toast-container { position: fixed; bottom: 20px; right: 20px; z-index: 1001; display: flex; flex-direction: column; gap: 10px; }
.toast { padding: 15px 25px; border-radius: 10px; color: #fff; font-weight: 600; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3); opacity: 0; transform: translateX(100%); animation: slideIn 0.5s forwards, fadeOut 0.5s 4s forwards; }
.toast.success { background-color: var(--success-color); }
.toast.error { background-color: var(--error-color); }
@keyframes slideIn { to { opacity: 1; transform: translateX(0); } }
@keyframes fadeOut { to { opacity: 0; transform: translateX(100%); } }
.login-gate { width: 100%; max-width: 400px; padding: 3rem; background: var(--glass-bg); border: 1px solid var(--glass-border); border-radius: var(--border-radius); backdrop-filter: blur(15px); -webkit-backdrop-filter: blur(15px); box-shadow: 0 8px 32px 0 var(--shadow-color); text-align: center; }
.login-gate h1 { margin-bottom: 0.5rem; font-weight: 600; }
.login-gate p { margin-bottom: 2rem; color: var(--text-color-muted); }
.login-gate .input-group { position: relative; margin-bottom: 1.5rem; }
.login-gate i { position: absolute; left: 15px; top: 50%; transform: translateY(-50%); color: var(--text-color-muted); }
.login-gate input { width: 100%; padding: 1rem 1rem 1rem 3rem; background: var(--input-bg); border: 1px solid var(--glass-border); border-radius: 0.75rem; color: var(--text-color); font-family: var(--font-primary); font-size: 1rem; transition: all var(--transition-speed) ease; }
.login-gate input:focus { outline: none; border-color: var(--glow-color); box-shadow: 0 0 15px rgba(0, 191, 255, 0.5); }
.login-gate .btn { width: 100%; }

/* --- Responsive Design --- */
@media (max-width: 768px) {
    body {
        padding-bottom: 80px; 
    }
    .app-header {
        position: fixed;
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        height: 70px;
        display: flex;
        justify-content: space-around;
        align-items: stretch;
        background: var(--glass-bg);
        border-top: 1px solid var(--glass-border);
        backdrop-filter: blur(15px);
        -webkit-backdrop-filter: blur(15px);
        padding: 0;
        margin: 0;
        border-radius: 0;
        border-bottom: none;
        box-shadow: 0 -5px 20px rgba(0,0,0,0.1);
    }
    .app-nav, .header-actions {
        position: static;
        transform: none;
        flex-grow: 0;
        display: contents; 
    }
    .app-header .nav-link, .app-header .icon-btn {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        flex: 1;
        gap: 4px;
        text-decoration: none;
        color: var(--text-color-muted);
        background: none;
        border: none;
        cursor: pointer;
        transition: color 0.2s ease-in-out, transform 0.2s ease-in-out;
    }
    .app-header .nav-link i, .app-header .icon-btn i {
        font-size: 1.4rem;
        line-height: 1;
    }
    .app-header .nav-link span {
        display: block;
        font-size: 0.7rem;
        font-weight: 500;
    }
    .app-header #nav-settings::after, .app-header #logout-button::after {
        display: block;
        font-size: 0.7rem;
        font-weight: 500;
        margin-top: -4px;
    }
    .app-header #nav-settings::after { content: "Settings"; }
    .app-header #logout-button::after { content: "Logout"; }
    .app-header .nav-link.active {
        color: var(--glow-color);
        transform: translateY(-2px);
    }
    .app-header .nav-link.active::after { display: none; }
    .header-logo { display: none; }
    .app-main { padding: 1.5rem; }
    .fab {
        bottom: 90px;
        right: 1.5rem;
    }
    #toast-container { bottom: 90px; }
    .memory-detail-modal-content {
        max-width: 90vw !important;
    }
    .memory-detail-content { 
        grid-template-columns: 1fr; 
        gap: 1rem;
    }
    .memory-detail-info {
        border-left: none;
        padding: 0;
    }
    .memory-detail-image {
        border-radius: 0.75rem;
    }
    .memory-detail-image img {
        max-height: 50vh;
        border-radius: 0.75rem;
    }
    .memory-detail-info h3 {
        display: none;
    }
    .folder-view-header .btn span {
        display: none;
    }
    .folder-view-header .btn {
        padding: 0.6rem 0.7rem;
        gap: 0;
    }
}

@media (max-width: 480px) {
    .notes-grid { 
        grid-template-columns: 1fr;
    }
    .image-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .modal-content { 
        padding: 1.5rem; 
    }
}

/* --- FOLDER FEATURE STYLES --- */
.folder-nav {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--glass-border);
    flex-wrap: wrap; 
}

.btn-folder {
    padding: 0.6rem 1.2rem;
    font-family: var(--font-primary);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-color-muted);
    background-color: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: 0.75rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-folder:hover {
    color: var(--text-color);
    background-color: var(--note-item-bg);
    border-color: var(--glow-color);
}

.btn-add-folder {
    color: var(--glow-color);
    border-style: dashed;
    border-color: rgba(255, 92, 138, 0.5);
    background: transparent;
}
.btn-add-folder:hover {
    background: rgba(255, 92, 138, 0.1);
    border-color: var(--glow-color);
}

.folder-view-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.folder-view-header h2 {
    margin: 0;
    font-weight: 600;
    color: var(--text-color);
}

.folder-photo-item {
    position: relative;
    overflow: hidden;
    aspect-ratio: 1/1;
    border-radius: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: var(--input-bg);
}

.folder-photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.folder-photo-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--glow-shadow);
}

.folder-photo-item:hover img {
    transform: scale(1.1);
}

.folder-photo-item .overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
    color: white;
    padding: 1.5rem 1rem 1rem;
    transform: translateY(100%);
    transition: transform 0.4s ease;
    font-size: 0.9rem;
    text-align: center;
    font-weight: 600;
}

.folder-photo-item:hover .overlay {
    transform: translateY(0);
}

.photo-detail-modal-content .modal-body {
    padding: 0;
}

.photo-detail-modal-content img {
    width: 100%;
    max-height: 75vh;
    object-fit: contain;
    display: block;
    border-radius: 1rem;
}

.delete-folder-container {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--glass-border);
    text-align: center;
}



/* --- Remove default browser focus outline --- */
button:focus,
input:focus,
textarea:focus,
select:focus {
    outline: none;
}

/* --- Screenshot/Print Protection --- */
@media print {
    body::before {
        content: "Content is protected and cannot be printed.";
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background-color: #150815;
        color: #FFE6F0;
        display: flex;
        justify-content: center;
        align-items: center;
        font-size: 2rem;
        z-index: 99999;
    }

    body > * {
        display: none !important;
    }
}