:root {
    /* Color Palette - Premium Dark Theme */
    --bg-App: #0f111a;
    --bg-Panel: rgba(23, 25, 35, 0.7);
    --bg-Card: rgba(30, 32, 45, 0.6);

    /* Brand Colors */
    --primary: #6C5CE7;
    --primary-hover: #5649c0;
    --accent-teal: #00CEC9;
    --accent-pink: #FD79A8;

    /* Status */
    --danger: #ff5c7a;
    --danger-hover: #ff3b63;

    /* Typography Colors */
    --text-main: #FFFFFF;
    --text-muted: #A0AEC0;
    --text-placeholder: #718096;

    /* Spacing & Borders */
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 8px;

    /* Glassmorphism */
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --backdrop-blur: blur(20px);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
    background-color: var(--bg-App);
    background-image:
        radial-gradient(at 0% 0%, rgba(108, 92, 231, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(0, 206, 201, 0.15) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
}

/* --- Layout --- */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    padding: 1rem 0;
    gap: 1rem;
    flex-wrap: wrap;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    font-size: 1.6rem;
    background: linear-gradient(135deg, var(--primary), var(--accent-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 10px rgba(108, 92, 231, 0.5));
}

.logo-text {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

h1 {
    font-weight: 700;
    font-size: 1.5rem;
    background: linear-gradient(to right, #fff, #A0AEC0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.header-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
}

/* --- Toolbar --- */
.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 1rem 1.25rem;
    background: rgba(255,255,255,0.03);
    border: var(--glass-border);
    border-radius: var(--radius-lg);
    backdrop-filter: var(--backdrop-blur);
}

.search-box {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    padding: 0.6rem 0.75rem;
}

.search-icon {
    color: var(--text-muted);
    font-size: 1rem;
}

.search-box input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-main);
    font-size: 1rem;
    outline: none;
    min-width: 120px;
}

.clear-search {
    font-size: 1.4rem;
    line-height: 1;
    padding: 0 0.25rem;
    opacity: 0;
    pointer-events: none;
}

.toolbar-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.select {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-main);
    border-radius: var(--radius-md);
    padding: 0.6rem 0.75rem;
    outline: none;
}

.select option {
    background: #1a1d29;
}

.note-count {
    color: var(--text-muted);
    font-size: 0.9rem;
    white-space: nowrap;
}

/* --- Buttons --- */
.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.4);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(108, 92, 231, 0.6);
}

.btn-secondary {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.12);
    color: var(--text-main);
    padding: 0.75rem 1.1rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}

.btn-danger {
    background: rgba(255, 92, 122, 0.16);
    border: 1px solid rgba(255, 92, 122, 0.35);
    color: #ffd0d8;
    padding: 0.75rem 1.1rem;
    border-radius: var(--radius-md);
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-danger:hover {
    background: rgba(255, 92, 122, 0.24);
    transform: translateY(-2px);
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color 0.2s;
}

.btn-icon:hover {
    color: var(--text-main);
}

.btn-xs {
    background: rgba(255, 50, 50, 0.2);
    color: #ffb3c1;
    border: 1px solid rgba(255, 50, 50, 0.3);
    padding: 0.3rem 0.8rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    cursor: pointer;
}

.btn-xs:hover {
    background: rgba(255, 50, 50, 0.3);
}

/* --- Grid & Cards --- */
.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    padding-bottom: 4rem;
}

.note-card {
    background: var(--bg-Card);
    backdrop-filter: var(--backdrop-blur);
    border: var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}

.note-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    border-color: rgba(255,255,255,0.2);
}

.note-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.75rem;
}

.note-meta {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    min-width: 0;
}

.note-title {
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-main);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.pin-indicator {
    opacity: 0.85;
    margin-left: 0.35rem;
    font-size: 0.95rem;
}

.note-actions {
    display: flex;
    gap: 0.25rem;
    align-items: center;
}

.note-date {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.pin-btn,
.delete-btn {
    opacity: 0;
    transition: opacity 0.2s, color 0.2s;
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1.05rem;
    color: var(--text-muted);
    padding: 0.25rem 0.4rem;
    border-radius: var(--radius-sm);
}

.note-card:hover .pin-btn,
.note-card:hover .delete-btn {
    opacity: 1;
}

.pin-btn:hover {
    color: var(--accent-teal);
    background: rgba(0, 206, 201, 0.12);
}

.delete-btn:hover {
    color: var(--accent-pink);
    background: rgba(253, 121, 168, 0.12);
}

.note-content {
    color: var(--text-main);
    font-size: 1rem;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-word;

    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 6;
    overflow: hidden;
}

.note-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-top: 0.25rem;
    border: 1px solid rgba(255,255,255,0.05);
}

.note-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 0.25rem;
}

.tag {
    font-size: 0.75rem;
    color: var(--text-muted);
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    padding: 0.25rem 0.55rem;
    border-radius: 999px;
}

.note-tag {
    width: 40px;
    height: 4px;
    border-radius: 4px;
    background: var(--primary);
    margin-top: auto;
}

/* --- Empty State --- */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
    background: rgba(255,255,255,0.02);
    border-radius: var(--radius-lg);
    border: 1px dashed rgba(255,255,255,0.1);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* --- Modal --- */
.hidden {
    display: none !important;
    opacity: 0;
    pointer-events: none;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal-content {
    width: 90%;
    max-width: 560px;
    background: #1a1d29;
    border: var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
    display: flex;
    flex-direction: column;
    animation: slideUp 0.4s cubic-bezier(0.19, 1, 0.22, 1);
}

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

.modal-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.6rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.form-group input,
.form-group textarea {
    width: 100%;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    padding: 0.95rem 1rem;
    color: var(--text-main);
    font-size: 1rem;
    resize: none;
    outline: none;
    transition: border-color 0.2s, background 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    background: rgba(255,255,255,0.05);
}

.hint {
    margin-top: 0.45rem;
    font-size: 0.8rem;
    color: var(--text-placeholder);
}

.form-row {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
}

.form-row .grow {
    flex: 1;
}

.pin-toggle {
    width: 120px;
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    user-select: none;
    cursor: pointer;
    padding: 0.95rem 1rem;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
}

.checkbox input {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

.media-upload-area {
    border: 2px dashed rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.media-upload-area:hover {
    border-color: var(--primary);
    background: rgba(108, 92, 231, 0.05);
}

.media-upload-area.drag-over {
    border-color: var(--primary);
    background: rgba(108, 92, 231, 0.08);
}

.upload-placeholder .icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 0.5rem;
}

#image-preview {
    width: 100%;
    max-height: 240px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    display: block;
}

#image-preview-container {
    position: relative;
}

#remove-image-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.2s;
    z-index: 10;
}

#image-preview-container:hover #remove-image-btn {
    opacity: 1;
}

.color-picker label {
    display: block;
    margin-bottom: 0.8rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.color-options {
    display: flex;
    gap: 1rem;
}

.color-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: transform 0.2s;
}

.color-btn.selected {
    border-color: white;
    transform: scale(1.2);
}

.modal-footer {
    padding: 1.25rem 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.05);
    display: flex;
    gap: 1rem;
    align-items: center;
}

.modal-footer .spacer {
    flex: 1;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* --- Toast --- */
.toast-container {
    position: fixed;
    left: 50%;
    bottom: 22px;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 2000;
    pointer-events: none;
}

.toast {
    pointer-events: none;
    background: rgba(26,29,41,0.92);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 999px;
    padding: 0.65rem 0.95rem;
    color: var(--text-main);
    font-size: 0.9rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.35);
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.2s ease, transform 0.2s ease;
    max-width: min(560px, calc(100vw - 32px));
    text-align: center;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast-success {
    border-color: rgba(0,206,201,0.35);
}

.toast-info {
    border-color: rgba(108,92,231,0.35);
}

.toast-error {
    border-color: rgba(255,92,122,0.45);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* --- Responsive --- */
@media (max-width: 760px) {
    .app-container {
        padding: 1.25rem;
    }

    .app-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .header-actions {
        width: 100%;
        justify-content: flex-start;
    }

    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .toolbar-right {
        justify-content: space-between;
    }

    .notes-grid {
        grid-template-columns: 1fr;
    }

    .pin-btn,
    .delete-btn {
        opacity: 1;
    }

    #remove-image-btn {
        opacity: 1;
    }
}

/* --- Header groups --- */
.header-note-actions,
.header-user-actions,
.header-auth-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
}

.user-chip {
    max-width: 240px;
    justify-content: flex-start;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-name-prefix {
    color: var(--text-muted);
}

/* --- Segmented (view switch) --- */
.segmented {
    display: flex;
    align-items: center;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 999px;
    padding: 0.25rem;
}

.seg-btn {
    border: none;
    background: transparent;
    color: var(--text-muted);
    padding: 0.55rem 0.9rem;
    border-radius: 999px;
    cursor: pointer;
    font-weight: 700;
    transition: background 0.2s, color 0.2s, opacity 0.2s;
}

.seg-btn.active {
    background: rgba(255,255,255,0.10);
    color: var(--text-main);
}

.seg-btn.disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

/* Toolbar right can wrap on narrow screens */
.toolbar-right {
    flex-wrap: wrap;
}

/* --- Note meta extras --- */
.note-sub {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.72rem;
    padding: 0.15rem 0.55rem;
    border-radius: 999px;
    border: 1px solid rgba(0,206,201,0.25);
    background: rgba(0,206,201,0.12);
    color: #b8fff3;
}

/* --- Modal title row --- */
.modal-title-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.72rem;
    padding: 0.18rem 0.55rem;
    border-radius: 999px;
    border: 1px solid rgba(255,255,255,0.12);
    background: rgba(255,255,255,0.05);
    color: var(--text-muted);
}

/* --- Toggle group in modal --- */
.toggle-group {
    display: flex;
    gap: 0.75rem;
    width: 220px;
}

.toggle-group .checkbox {
    flex: 1;
    justify-content: center;
}

.checkbox input:disabled {
    cursor: not-allowed;
}

.checkbox input:disabled + span {
    opacity: 0.75;
}

/* --- Disabled states --- */
.media-upload-area.disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.media-upload-area.disabled:hover {
    border-color: rgba(255,255,255,0.1);
    background: transparent;
}

.color-btn.disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* --- Auth modal --- */
.tabs {
    display: flex;
    gap: 0.5rem;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    padding: 0.25rem;
}

.tab {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text-muted);
    padding: 0.7rem 0.9rem;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 800;
    transition: background 0.2s, color 0.2s;
}

.tab.active {
    background: rgba(255,255,255,0.10);
    color: var(--text-main);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
}

.auth-message {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    min-height: 1.2em;
}

.auth-message.auth-error {
    color: #ffd0d8;
}

.auth-message.auth-success {
    color: #b8fff3;
}

.full-width {
    width: 100%;
    justify-content: center;
}

@media (max-width: 760px) {
    .form-row {
        flex-direction: column;
        align-items: stretch;
    }

    .toggle-group {
        width: 100%;
    }
}


.btn-link {
    background: transparent;
    border: none;
    color: rgba(0,206,201,0.95);
    font-weight: 700;
    cursor: pointer;
    padding: 0.35rem 0.25rem;
    text-decoration: underline;
    text-underline-offset: 3px;
    align-self: center;
}

.btn-link:hover {
    color: #b8fff3;
}


.oauth-box {
    margin-top: 1rem;
}

.oauth-btn {
    font-weight: 800;
}

.divider {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 0.9rem 0 0.2rem;
    color: var(--text-placeholder);
    font-size: 0.85rem;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: rgba(255,255,255,0.08);
}

.divider span {
    padding: 0 0.25rem;
}

.auth-message.auth-info {
    color: var(--text-muted);
}


/* --- Better mobile interactions --- */
button,
label[for],
a {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

/* --- Better modal scrolling (all screens) --- */
.modal-content {
    max-height: calc(100vh - 48px);
    overflow: hidden;
}

.modal-body {
    overflow-y: auto;
    min-height: 0;
    -webkit-overflow-scrolling: touch;
}

.modal-header,
.modal-footer {
    flex-shrink: 0;
}

.toast-container {
    bottom: calc(22px + env(safe-area-inset-bottom));
}

/* --- Mobile refinements --- */
@media (max-width: 520px) {
    .app-container {
        padding: 1rem;
    }

    .toolbar {
        padding: 0.9rem;
        border-radius: 18px;
    }

    .search-box {
        padding: 0.55rem 0.65rem;
    }

    .header-actions {
        width: 100%;
        justify-content: flex-start;
    }

    .header-note-actions,
    .header-user-actions,
    .header-auth-actions {
        width: 100%;
        justify-content: flex-start;
    }

    .header-note-actions > button,
    .header-note-actions > label,
    .header-auth-actions > button {
        flex: 1 1 calc(50% - 0.75rem);
    }

    .user-chip {
        flex: 1 1 auto;
        max-width: 100%;
    }

    .toolbar-right {
        width: 100%;
        gap: 0.75rem;
    }

    .segmented {
        width: 100%;
    }

    .seg-btn {
        flex: 1;
    }

    .select {
        width: 100%;
    }

    .note-count {
        width: 100%;
        text-align: left;
    }

    .notes-grid {
        gap: 1rem;
        padding-bottom: 2.5rem;
    }

    .note-card {
        padding: 1.25rem;
        border-radius: 20px;
    }

    .note-image {
        height: 160px;
    }

    .modal-overlay {
        align-items: flex-end;
        padding: 0;
    }

    .modal-content {
        width: 100%;
        max-width: none;
        border-radius: 18px 18px 0 0;
        max-height: calc(100vh - 12px);
    }

    .modal-header {
        padding: 1.1rem 1rem;
    }

    .modal-body {
        padding: 1rem;
    }

    .modal-footer {
        padding: 1rem;
        padding-bottom: calc(1rem + env(safe-area-inset-bottom));
    }

    .toast-container {
        bottom: calc(14px + env(safe-area-inset-bottom));
    }
}

@media (hover: none) and (pointer: coarse) {
    .note-card:hover {
        transform: none;
        box-shadow: none;
    }

    .btn-primary:hover,
    .btn-secondary:hover,
    .btn-danger:hover {
        transform: none;
        box-shadow: none;
    }
}