:root {
    /* Color Palette */
    --bg-color: #030712;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --card-bg: rgba(17, 24, 39, 0.6);
    --card-border: rgba(255, 255, 255, 0.08);
    --accent-default: #60a5fa;
    
    /* Effects */
    --blur-strong: blur(16px);
    --shadow-soft: 0 10px 40px -10px rgba(0,0,0,0.5);
    
    /* Typography */
    --font-sans: 'Plus Jakarta Sans', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-sans);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Stunning Background Effects */
.background-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
    animation: float 20s infinite ease-in-out alternate;
}

.orb-1 {
    top: -10%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, rgba(56,189,248,0.3) 0%, rgba(0,0,0,0) 70%);
}

.orb-2 {
    bottom: -20%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, rgba(167,139,250,0.2) 0%, rgba(0,0,0,0) 70%);
    animation-delay: -5s;
}

.orb-3 {
    top: 40%;
    left: 30%;
    width: 40vw;
    height: 40vw;
    background: radial-gradient(circle, rgba(232,121,249,0.15) 0%, rgba(0,0,0,0) 70%);
    animation-duration: 25s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(50px, 30px) scale(1.1); }
}

/* App Layout */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--card-border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo i {
    font-size: 2rem;
    color: var(--text-primary);
    background: linear-gradient(135deg, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.05em;
}

/* Buttons */
button {
    font-family: var(--font-sans);
    cursor: pointer;
    border: none;
    outline: none;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.primary-btn {
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-weight: 600;
    font-size: 0.95rem;
    gap: 0.5rem;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.5);
}

.primary-btn:active {
    transform: translateY(0);
}

.secondary-btn {
    background: transparent;
    color: var(--text-secondary);
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-weight: 500;
}

.secondary-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.icon-btn {
    background: rgba(255,255,255,0.05);
    color: var(--text-secondary);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 1.25rem;
    backdrop-filter: blur(4px);
    border: 1px solid transparent;
}

.icon-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border-color: rgba(239, 68, 68, 0.2);
    transform: scale(1.05);
}

/* Main Content area */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Notes Grid */
.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

/* Note Card */
.note-card {
    background: var(--card-bg);
    backdrop-filter: var(--blur-strong);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    position: relative;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    cursor: pointer;
    min-height: 200px;
}

/* Accent line at the top of the card */
.note-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--note-accent, var(--accent-default));
    transition: height 0.3s;
}

.note-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 15px 30px rgba(0,0,0,0.4);
    border-color: rgba(255, 255, 255, 0.15);
}

.note-card:hover::before {
    height: 6px;
}

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

.note-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    line-height: 1.3;
    word-break: break-word;
}

.note-date {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: block;
}

.note-content {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    flex: 1;
    word-break: break-word;
    /* Limit lines */
    display: -webkit-box;
    -webkit-line-clamp: 5;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.note-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s;
}

.note-card:hover .note-actions {
    opacity: 1;
    transform: translateY(0);
}

/* Empty State */
.empty-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    opacity: 0.7;
    animation: fadeIn 0.5s ease-out;
}

.empty-state.hidden {
    display: none;
}

.empty-icon-wrapper {
    width: 80px;
    height: 80px;
    background: rgba(255,255,255,0.03);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 3rem;
    color: var(--text-secondary);
}

.empty-state h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--text-secondary);
    max-width: 300px;
}

/* Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 1;
    visibility: visible;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

.modal {
    background: rgba(17, 24, 39, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(20px);
    width: 90%;
    max-width: 600px;
    border-radius: 20px;
    overflow: hidden;
    transform: scale(1) translateY(0);
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-overlay.hidden .modal {
    transform: scale(0.95) translateY(20px);
}

.modal-header {
    padding: 1.5rem 1.5rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Inputs */
input, textarea {
    width: 100%;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    padding: 1rem;
    font-size: 1rem;
    transition: all 0.2s;
    outline: none;
}

input:focus, textarea:focus {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 0 0 2px rgba(96, 165, 250, 0.2);
}

input::placeholder, textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

input {
    font-size: 1.25rem;
    font-weight: 600;
}

textarea {
    resize: none;
    height: 200px;
    line-height: 1.6;
}

/* Color Picker */
.color-picker {
    margin-top: 0.5rem;
}

.color-picker p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.colors-wrap {
    display: flex;
    gap: 0.75rem;
}

.color-option {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: 2px solid transparent;
    transition: transform 0.2s;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.color-option:hover {
    transform: scale(1.15);
}

.color-option.active {
    transform: scale(1.15);
    border-color: white;
    box-shadow: 0 0 0 2px var(--accent);
}

/* Modal Footer */
.modal-footer {
    padding: 1rem 1.5rem 1.5rem;
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    border-top: 1px solid rgba(255,255,255,0.05);
}

/* Custom Scrollbar for the app */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes popIn {
    0% { opacity: 0; transform: scale(0.9) translateY(20px); }
    100% { opacity: 1; transform: scale(1) translateY(0); }
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .app-container {
        padding: 1rem;
    }
    
    header {
        margin-bottom: 2rem;
    }
    
    .notes-grid {
        grid-template-columns: 1fr;
    }
}