:root {
    --bg: #1e1e1e;
    --sidebar: #181818;
    --topbar: #181818;
    --panel: #252526;
    --panel-light: #2d2d30;
    --input: #3c3c3c;
    --border: #3e3e42;

    --text: #d4d4d4;
    --text-bright: #ffffff;
    --muted: #858585;

    --cyan: #4fc1ff;
    --green: #6a9955;
    --purple: #c586c0;
    --yellow: #dcdcaa;
    --red: #f44747;

    --radius: 6px;
}

button,
input,
textarea,
select,
.sidebar-item,
.card,
.account-button,
.new-button,
.card-action,
.close-button,
.cancel-button,
.save-button,
.search-box {
    transition:
        background-color 0.18s ease,
        color 0.18s ease,
        border-color 0.18s ease,
        box-shadow 0.18s ease,
        transform 0.18s ease,
        opacity 0.18s ease;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    min-height: 100%;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
}

.auth-screen {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #0d1117;
    z-index: 1000;
    transition:
        opacity 0.2s ease,
        visibility 0.2s ease;
}

.auth-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.auth-card {
    width: min(420px, calc(100% - 32px));
    padding: 38px;
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 10px;
    box-shadow:
        0 20px 60px rgba(0, 0, 0, 0.45);
}

.auth-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: var(--cyan);
    background: #1f2937;
    border: 1px solid #374151;
    border-radius: 10px;
    font-size: 22px;
    font-weight: 700;
}

.auth-card h1 {
    margin: 0;
    color: var(--text-bright);
    text-align: center;
    font-size: 28px;
}

.auth-subtitle {
    margin: 8px 0 28px;
    color: var(--muted);
    text-align: center;
    font-size: 14px;
}

.auth-field {
    margin-bottom: 18px;
}

.auth-field label {
    display: block;
    margin-bottom: 7px;
    color: var(--text);
    font-size: 13px;
}

.auth-field input {
    width: 100%;
    padding: 11px 12px;
    color: var(--text-bright);
    background: #0d1117;
    border: 1px solid #30363d;
    border-radius: var(--radius);
    outline: none;
    font-size: 14px;
}

.auth-field input:focus {
    border-color: var(--cyan);
    box-shadow:
        0 0 0 2px rgba(79, 193, 255, 0.12);
}

.auth-button,
.auth-secondary-button {
    width: 100%;
    padding: 11px 14px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
}

.auth-button {
    color: #ffffff;
    background: #238636;
    border: 1px solid #2ea043;
}

.auth-button:hover {
    background: #2ea043;
}

.auth-secondary-button {
    margin-top: 10px;
    color: var(--text);
    background: transparent;
    border: 1px solid #30363d;
}

.auth-secondary-button:hover {
    background: #21262d;
    border-color: #8b949e;
}

.auth-button:disabled,
.auth-secondary-button:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.auth-message {
    min-height: 20px;
    margin: 16px 0 0;
    color: #f85149;
    text-align: center;
    font-size: 13px;
}

.topbar {
    height: 64px;
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 0 24px;
    background: var(--topbar);
    border-bottom: 1px solid var(--border);
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--cyan);
    background: #202020;
    border: 1px solid var(--border);
    border-radius: 5px;
    font-size: 14px;
    font-weight: 700;
}

.brand-icon:hover {
    background: #272727;
    border-color: #555;
    box-shadow:
        0 0 8px rgba(79, 193, 255, 0.08);
}

.brand-text h1 {
    margin: 0;
    color: var(--text-bright);
    font-size: 16px;
    font-weight: 600;
}

.brand-text p {
    margin: 2px 0 0;
    color: var(--muted);
    font-size: 11px;
}

.account-panel {
    position: fixed;
    top: 10px;
    right: 18px;
    min-width: 270px;
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 10px 12px;
    background: #151515;
    border: 1px solid #414141;
    border-radius: 7px;
    box-shadow:
        0 8px 28px rgba(0, 0, 0, 0.35);
    z-index: 500;
    transition:
        background-color 0.18s ease,
        border-color 0.18s ease,
        box-shadow 0.18s ease;
}

.account-panel:hover {
    border-color: #555;
}

.account-status {
    display: flex;
    align-items: center;
    gap: 9px;
    min-width: 0;
    flex: 1;
}

.account-dot {
    width: 9px;
    height: 9px;
    flex-shrink: 0;
    background: #777;
    border-radius: 50%;
    transition:
        background-color 0.18s ease,
        box-shadow 0.18s ease;
}

.account-dot.logged-in {
    background: var(--green);
    box-shadow:
        0 0 7px rgba(106, 153, 85, 0.6);
}

.account-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.account-info strong {
    color: var(--text-bright);
    font-size: 12px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 125px;
}

.account-info span {
    margin-top: 2px;
    color: var(--muted);
    font-size: 10px;
    white-space: nowrap;
}

.account-actions {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

.account-button {
    padding: 7px 10px;
    color: var(--text);
    background: #252526;
    border: 1px solid #444;
    border-radius: 4px;
    cursor: pointer;
    font-size: 11px;
    font-weight: 600;
}

.account-button:hover {
    background: #333337;
    border-color: #666;
}

.account-button:active {
    transform: scale(0.96);
}

.account-button.primary {
    color: #ffffff;
    background: #0e7490;
    border-color: #155e75;
}

.account-button.primary:hover {
    background: #0891b2;
    border-color: #22a9c9;
    box-shadow:
        0 0 8px rgba(8, 145, 178, 0.2);
}

.account-button.logout {
    color: #f48771;
    border-color: #4b2b2b;
}

.account-button.logout:hover {
    color: #ffffff;
    background: #3a2020;
    border-color: var(--red);
    box-shadow:
        0 0 8px rgba(244, 71, 71, 0.12);
}

.app {
    min-height: calc(100vh - 64px);
    display: flex;
}

.sidebar {
    width: 220px;
    flex-shrink: 0;
    padding: 20px 12px;
    background: var(--sidebar);
    border-right: 1px solid var(--border);
}

.sidebar-title {
    padding: 0 10px 12px;
    color: var(--muted);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.sidebar-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 9px;
    margin-bottom: 4px;
    padding: 9px 10px;
    color: var(--text);
    background: transparent;
    border: 1px solid transparent;
    border-radius: 4px;
    cursor: pointer;
    text-align: left;
    font-size: 13px;
}

.sidebar-item:hover {
    background: #252526;
    color: var(--text-bright);
    border-color: #303030;
}

.sidebar-item:active {
    transform: scale(0.985);
}

.sidebar-item.active {
    color: var(--cyan);
    background: #2a2d2e;
    border-color: #37373d;
    box-shadow:
        inset 3px 0 0 var(--cyan),
        inset 0 0 12px rgba(79, 193, 255, 0.06);
}

.sidebar-item.active:hover {
    background: #303335;
    border-color: #41464a;
}

.category-count {
    margin-left: auto;
    color: var(--muted);
    font-size: 11px;
}

.sidebar-item:hover .category-count {
    color: var(--text);
}

.sidebar-item.active .category-count {
    color: var(--cyan);
}

.main {
    flex: 1;
    min-width: 0;
    padding: 28px 32px 40px;
}

.workspace-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 24px;
}

.workspace-header h2 {
    margin: 0 0 6px;
    color: var(--text-bright);
    font-size: 22px;
}

.workspace-header p {
    margin: 0;
    color: var(--muted);
    font-size: 13px;
}

.new-button {
    padding: 10px 15px;
    color: #ffffff;
    background: #0e7490;
    border: 1px solid #155e75;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
}

.new-button:hover {
    background: #0891b2;
    border-color: #22a9c9;
    box-shadow:
        0 0 9px rgba(8, 145, 178, 0.16);
}

.new-button:active {
    transform: scale(0.97);
}

.new-button.guest {
    color: var(--text);
    background: #333337;
    border-color: #555;
}

.new-button.guest:hover {
    color: var(--text-bright);
    background: #3d3d42;
    border-color: #707070;
    box-shadow:
        0 0 8px rgba(255, 255, 255, 0.04);
}

.toolbar {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.search-box {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 12px;
    background: var(--input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.search-box:hover {
    border-color: #555;
}

.search-box:focus-within {
    border-color: var(--cyan);
    box-shadow:
        0 0 0 2px rgba(79, 193, 255, 0.08);
}

.search-box span {
    color: var(--muted);
    font-size: 19px;
}

.search-box:focus-within span {
    color: var(--cyan);
}

.search-box input {
    width: 100%;
    padding: 10px 0;
    color: var(--text-bright);
    background: transparent;
    border: 0;
    outline: none;
    font-size: 13px;
}

.toolbar select,
.form-group select {
    padding: 10px 12px;
    color: var(--text);
    background: var(--input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    outline: none;
    cursor: pointer;
    font-size: 13px;
}

.toolbar select:hover,
.form-group select:hover {
    background: #414141;
    border-color: #555;
}

.toolbar select:focus,
.form-group select:focus {
    border-color: var(--cyan);
    box-shadow:
        0 0 0 2px rgba(79, 193, 255, 0.08);
}

.cards {
    display: grid;
    grid-template-columns:
        repeat(
            auto-fill,
            minmax(280px, 1fr)
        );
    gap: 16px;
}

.card {
    min-width: 0;
    display: flex;
    flex-direction: column;
    min-height: 230px;
    padding: 18px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.card:hover {
    border-color: #5a5d63;
    background: var(--panel-light);
    transform: translateY(-2px);
    box-shadow:
        0 7px 20px rgba(0, 0, 0, 0.22);
}

.card-header {
    display: flex;
    justify-content: space-between;
    gap: 12px;
}

.card-tag {
    display: inline-block;
    margin-bottom: 9px;
    padding: 3px 7px;
    border-radius: 4px;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-tag.coding {
    color: var(--cyan);
    background: rgba(79, 193, 255, 0.1);
}

.card-tag.school {
    color: var(--yellow);
    background: rgba(220, 220, 170, 0.1);
}

.card-tag.ideas {
    color: var(--purple);
    background: rgba(197, 134, 192, 0.1);
}

.card-tag.personal {
    color: var(--green);
    background: rgba(106, 153, 85, 0.1);
}

.card-title {
    margin: 0;
    color: var(--text-bright);
    font-size: 16px;
    font-weight: 600;
    word-break: break-word;
}

.card-actions {
    display: flex;
    gap: 4px;
}

.card-action {
    width: 28px;
    height: 28px;
    color: var(--muted);
    background: transparent;
    border: 0;
    border-radius: 4px;
    cursor: pointer;
    font-size: 17px;
}

.card-action:hover {
    color: var(--text-bright);
    background: #333337;
}

.card-action:active {
    transform: scale(0.9);
}

.delete-action:hover {
    color: var(--red);
    background: rgba(244, 71, 71, 0.08);
}

.card-content {
    flex: 1;
    margin-top: 14px;
    color: #b8b8b8;
    font-size: 13px;
    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;
}

.card-footer {
    margin-top: 16px;
    padding-top: 12px;
    color: var(--muted);
    border-top: 1px solid #333336;
    font-size: 11px;
}

.empty-state {
    grid-column: 1 / -1;
    padding: 70px 20px;
    text-align: center;
}

.empty-icon {
    margin-bottom: 12px;
    color: #555;
    font-size: 32px;
}

.empty-state h3 {
    margin: 0 0 6px;
    color: var(--text);
    font-size: 16px;
}

.empty-state p {
    margin: 0;
    color: var(--muted);
    font-size: 13px;
}

.modal-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: rgba(0, 0, 0, 0.65);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition:
        opacity 0.15s ease,
        visibility 0.15s ease;
    z-index: 900;
}

.modal-overlay.show {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.modal {
    width: min(620px, 100%);
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 7px;
    box-shadow:
        0 20px 70px rgba(0, 0, 0, 0.5);
    transform: translateY(6px) scale(0.99);
    transition:
        transform 0.18s ease;
}

.modal-overlay.show .modal {
    transform: translateY(0) scale(1);
}

.auth-modal {
    width: min(460px, 100%);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 17px 20px;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    margin: 0;
    color: var(--text-bright);
    font-size: 15px;
}

.close-button {
    width: 30px;
    height: 30px;
    color: var(--muted);
    background: transparent;
    border: 0;
    border-radius: 4px;
    cursor: pointer;
    font-size: 22px;
}

.close-button:hover {
    color: var(--text-bright);
    background: #333337;
}

.close-button:active {
    transform: scale(0.9);
}

.form {
    padding: 20px;
}

.form-group {
    margin-bottom: 18px;
}

.form-label {
    display: block;
    margin-bottom: 7px;
    color: var(--text);
    font-size: 12px;
    font-weight: 600;
}

.form-input,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    color: var(--text-bright);
    background: var(--input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    outline: none;
    font-family: inherit;
    font-size: 13px;
}

.form-input:hover,
.form-group textarea:hover {
    border-color: #555;
}

.form-input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--cyan);
    box-shadow:
        0 0 0 2px rgba(79, 193, 255, 0.1);
}

.form-group textarea {
    min-height: 180px;
    resize: vertical;
    line-height: 1.5;
}

.form-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding-top: 4px;
}

.cancel-button,
.save-button {
    padding: 9px 14px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
}

.cancel-button {
    color: var(--text);
    background: transparent;
    border: 1px solid var(--border);
}

.cancel-button:hover {
    color: var(--text-bright);
    background: #333337;
    border-color: #555;
}

.save-button {
    color: #ffffff;
    background: #0e7490;
    border: 1px solid #155e75;
}

.save-button:hover {
    background: #0891b2;
    border-color: #22a9c9;
    box-shadow:
        0 0 8px rgba(8, 145, 178, 0.15);
}

.cancel-button:active,
.save-button:active {
    transform: scale(0.96);
}

.save-button:disabled,
.account-button:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none;
}

.toast {
    position: fixed;
    right: 22px;
    bottom: 22px;
    max-width: 320px;
    padding: 11px 15px;
    color: var(--text-bright);
    background: #333337;
    border: 1px solid #555;
    border-radius: 5px;
    box-shadow:
        0 8px 30px rgba(0, 0, 0, 0.35);
    opacity: 0;
    transform: translateY(10px);
    pointer-events: none;
    transition:
        opacity 0.2s ease,
        transform 0.2s ease;
    z-index: 1200;
    font-size: 13px;
}

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

@media (max-width: 900px) {
    .account-panel {
        min-width: 245px;
    }
}

@media (max-width: 760px) {
    .topbar {
        padding: 0 14px;
    }

    .brand-text {
        display: none;
    }

    .sidebar {
        width: 170px;
    }

    .main {
        padding: 22px 18px 30px;
    }

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

    .new-button {
        width: 100%;
    }

    .toolbar {
        flex-direction: column;
    }

    .toolbar select {
        width: 100%;
    }

    .account-panel {
        top: 8px;
        right: 10px;
        min-width: 245px;
        padding: 8px 10px;
    }

    .account-info strong {
        max-width: 105px;
    }
}

@media (max-width: 560px) {
    .app {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        display: flex;
        overflow-x: auto;
        padding: 8px;
    }

    .sidebar-title {
        display: none;
    }

    .sidebar-item {
        min-width: 130px;
        margin: 0;
    }

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

    .account-panel {
        right: 7px;
        max-width: calc(100vw - 14px);
    }

    .account-status {
        display: none;
    }

    .account-actions {
        width: 100%;
    }

    .account-button {
        flex: 1;
    }

    .auth-card {
        padding: 28px 22px;
    }
}