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

.theme-toggle {
            background: transparent;
            border: 2px solid var(--toggle-border);
            border-radius: 50%;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: background 0.3s ease, transform 0.3s ease;
            font-size: 1.2rem;
            color: var(--toggle-icon);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
            margin-right: 50px;
}

.theme-toggle:hover {
    background: var(--toggle-hover);
    transform: scale(1.1);
}

.theme-toggle span {
    transition: transform 0.3s ease, opacity 0.3s ease;
}

:root {
    --toggle-border: #ddd;
    --toggle-icon: #333;
    --toggle-hover: #f0f0f0;
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --text-color: black;
    --bg-card: rgba(255, 255, 255, 0.95);
    --text-card: #333;
    --box-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
    --bg-header: rgba(255, 255, 255, 0.95);
    --header-border: rgba(255, 255, 255, 0.18);
    --card-bg: rgba(255, 255, 255, 0.95);
    --card-border: rgba(255, 255, 255, 0.18);
    --card-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
    --card-hover-shadow: 0 20px 40px rgba(31, 38, 135, 0.5);
    --nav-link-color: #333; 
    --nav-link-hover-bg: rgba(102, 126, 234, 0.1);
    --project-title-color: #333;
    --placeholder-bg: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    --placeholder-text: #666;
}

.dark-theme {
    --toggle-border: #888;
    --toggle-icon: #f9f9f9;
    --toggle-hover: #333;
    --bg-gradient: linear-gradient(135deg, #1a1445 0%, #2c1d5c 100%);
    --text-color: #e4e4f0;
    --bg-card: rgba(30, 25, 60, 0.9); 
    --text-card: #eee;
    --box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --bg-header: rgba(30, 25, 60, 0.9); 
    --header-border: rgba(255, 255, 255, 0.05);
    --card-bg: rgba(30, 25, 60, 0.9);
    --card-border: rgba(255, 255, 255, 0.05);
    --card-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    --card-hover-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
    --nav-link-color: #f1f1f1;
    --nav-link-hover-bg: rgba(255, 255, 255, 0.1);
    --project-title-color: #ffffff;
    --placeholder-bg: linear-gradient(135deg, #2a2d3e, #3b3f59);  /* deep bluish-purple tone */
    --placeholder-text: #ddd;
}

.header {
    background: var(--bg-header);
    backdrop-filter: blur(10px);
    box-shadow: var(--box-shadow);
    border-bottom: 1px solid var(--header-border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background 0.3s, border-bottom 0.3s, box-shadow 0.3s;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-left: 50px;
}

.nav {
    display: flex;
    gap: 2rem;
    align-items: center;
    flex-wrap: wrap;
}

.nav-link {
    color: var(--nav-link-color);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover {
    background: var(--nav-link-hover-bg);
    transform: translateY(-2px);
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-gradient);
    color: var(--text-color);
    min-height: 100vh;
    transition: background 0.3s ease, color 0.3s ease;
}

main {
    margin-left: 100px;
    margin-right: 100px;
}

.dark-theme .add_notes {
    background: inherit;
    backdrop-filter: blur(14px);
    border-radius: 16px;
    padding: 25px;
    margin-top: 60px;
    border: 2px solid rgba(255, 255, 255, 0.8);
    box-shadow: 0 0 18px rgba(255, 255, 255, 0.75); 
}

.add_notes, .mynotes {
    background: inherit;
    backdrop-filter: blur(14px);
    border-radius: 16px;
    padding: 25px;
    margin-top: 60px;
    border: 2px solid rgba(255, 255, 255, 0.7); 
    box-shadow: 0 0 14px rgba(255, 255, 255, 0.6);
}

.add_notes h2 .add, .mynotes h2 img{
    width: 25px;
    height: 25px;
    filter: none;
}

.mynotes h2 img{
    margin-right: 5px;
    transform: translateY(2px);
}

.dark-theme .add_notes h2 .add, .dark-theme .mynotes h2 img{
    filter: invert(100%) brightness(100%);
}

.add_notes h2{
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-color);
}

.mynotes h2{
    margin-bottom: 15px;
}
.add_notes label{
    font-size: 20px;
    letter-spacing: 0.5px;
}

.add_notes input:focus, .add_notes textarea:focus{
    border-color: var(--primary-color);
    box-shadow: 0 0 6px rgba(30, 144, 255, 0.5);
    outline: none;
}

.add_notes #title{
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    margin-top: 10px;
}

.add_notes textarea{
    width: 100%;
    height: 150px;
    padding: 10px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-family:'Inter', sans-serif;
    resize: vertical;
    margin-top: 10px;
}

.add_notes button {
    padding: 10px 18px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    background: transparent;
    color: var(--text-color);
    border: 1.5px solid rgba(255, 255, 255, 0.6);
    transition: all 0.3s ease;
}

.add_notes button:hover {
  border-color: #000;
  background: rgba(0, 0, 0, 0.05);
  transform: translateY(-1px);
}

.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.note-card {
    background: var(--card-bg);
    padding: 18px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--card-border);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.note-card h3 {
    margin-bottom: 10px;
    color: var(--text-color);
}

.note-card p {
    color: var(--text-color);
    white-space: pre-wrap;
}

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

.delete-btn {
    background: transparent;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    transition: 0.2s;
}

.delete-btn:hover {
    transform: scale(1.2);
    color: red;
}