/* ============================================
   DROPTOT - E-Ink Theme Stylesheet
   ============================================ */

:root {
    --ink-black: #1a1a1a;
    --ink-dark: #2d2d2d;
    --ink-medium: #5a5a5a;
    --ink-light: #8a8a8a;
    --ink-faint: #b5b5b5;
    --paper: #f5f5f0;
    --paper-dark: #e8e8e3;
    --paper-shadow: #d9d9d4;
    --node-bg: #fefefc;
    --wire-color: #888883;
    --danger: #8b4049;
    --danger-light: #a85860;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 20px;
    background: var(--paper);
    color: var(--ink-black);
    min-height: 100vh;
    padding: 2rem;
    background-image: 
        radial-gradient(ellipse at 20% 30%, rgba(0,0,0,0.02) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, rgba(0,0,0,0.015) 0%, transparent 50%);
    line-height: 1.75;
}

/* ==================== HEADER ==================== */

.header {
    text-align: center;
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--paper-shadow);
    position: relative;
}

.logo-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.logo-icon {
    height: 32px;
    width: 32px;
}

.logo-text {
    font-size: 1.6rem;
    font-weight: 300;
    color: var(--ink-dark);
    letter-spacing: 0.1em;
}

.logo-text strong {
    font-weight: 600;
}

.user-menu {
    position: absolute;
    top: 0;
    right: 0;
    font-size: 1rem;
    color: var(--ink-light);
}

.user-name {
    margin-right: 1rem;
}

.btn-link {
    background: none;
    border: none;
    color: var(--ink-medium);
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
    text-decoration: underline;
    padding: 0;
}

.btn-link:hover {
    color: var(--ink-black);
}

/* ==================== CONTAINER ==================== */

.container {
    max-width: 1000px;
    margin: 0 auto;
}

.auth-container {
    max-width: 450px;
}

/* ==================== TABS ==================== */

.tabs {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 2.5rem;
}

.tab {
    font-size: 1.2rem;
    font-weight: 400;
    color: var(--ink-light);
    cursor: pointer;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
    letter-spacing: 0.1em;
}

.tab:hover {
    color: var(--ink-medium);
}

.tab.active {
    color: var(--ink-black);
    border-bottom-color: var(--ink-black);
    font-weight: 500;
}

/* ==================== PANELS ==================== */

.panel {
    display: none;
}

.panel.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

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

/* ==================== SEARCH ==================== */

.search-container {
    position: relative;
    margin-bottom: 2rem;
}

.search-input {
    width: 100%;
    padding: 1rem 1.5rem;
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 1.3rem;
    font-weight: 400;
    border: 1px solid var(--paper-shadow);
    border-radius: 4px;
    background: var(--node-bg);
    color: var(--ink-black);
    outline: none;
    transition: all 0.3s ease;
}

.search-input:focus {
    border-color: var(--ink-light);
    box-shadow: 0 2px 20px rgba(0,0,0,0.05);
}

.search-input::placeholder {
    color: var(--ink-faint);
    font-style: italic;
}

.search-hint {
    font-size: 0.95rem;
    color: var(--ink-light);
    margin-top: 0.5rem;
    font-style: italic;
    text-align: center;
}

.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--node-bg);
    border: 1px solid var(--paper-shadow);
    border-top: none;
    border-radius: 0 0 4px 4px;
    max-height: 350px;
    overflow-y: auto;
    display: none;
    z-index: 100;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.search-results.visible {
    display: block;
}

.search-result-item {
    padding: 0.8rem 1.5rem;
    cursor: pointer;
    border-bottom: 1px solid var(--paper-dark);
    transition: background 0.2s ease;
}

.search-result-item:hover {
    background: var(--paper);
}

.search-result-item:last-child {
    border-bottom: none;
}

.result-title {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--ink-dark);
}

.result-associations {
    font-size: 1rem;
    color: var(--ink-light);
    font-style: italic;
    margin-top: 0.2rem;
}

.result-match-info {
    font-size: 0.9rem;
    color: var(--ink-faint);
    margin-top: 0.3rem;
    font-family: 'JetBrains Mono', monospace;
}

/* ==================== TREE VIEW ==================== */

.tree-container {
    position: relative;
    padding: 2rem 0;
}

/* ==================== THOUGHT CARD ==================== */

.thought-card {
    background: var(--node-bg);
    border: 2px solid var(--ink-dark);
    border-radius: 8px;
    padding: 1.5rem 2rem;
    margin-bottom: 1.5rem;
    text-align: center;
    position: relative;
}

.thought-header {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    position: relative;
}

.thought-title {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--ink-dark);
    margin: 0;
}

.thought-desc {
    font-size: 1rem;
    color: var(--ink-medium);
    font-style: italic;
    margin: 0.75rem 0 0 0;
    line-height: 1.6;
}

.btn-edit {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--ink-dark);
    border: 1px solid var(--ink-dark);
    color: var(--paper);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.btn-edit:hover {
    background: var(--ink-black);
    border-color: var(--ink-black);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

/* ==================== NODES ==================== */

.node {
    background: var(--node-bg);
    border: 1px solid var(--ink-faint);
    border-radius: 6px;
    padding: 0.75rem 1.4rem;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.25s ease;
    position: relative;
    text-align: center;
    z-index: 10;
}

.node:hover {
    border-color: var(--ink-medium);
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
    transform: translateY(-1px);
}

.node.root {
    font-size: 1.8rem;
    font-weight: 600;
    padding: 1.2rem 2rem;
    border-color: var(--ink-dark);
    border-width: 2px;
}

.node-description {
    font-size: 0.95rem;
    color: var(--ink-light);
    font-style: italic;
    margin-top: 0.3rem;
    font-weight: 300;
}

/* ==================== DEPTH LEVELS ==================== */

.depth-level {
    margin: 0;
    padding: 1.5rem 0;
    position: relative;
}

.depth-label {
    text-align: center;
    margin-bottom: 1rem;
    position: relative;
}

.depth-label::before,
.depth-label::after {
    content: '';
    position: absolute;
    top: 50%;
    width: calc(50% - 60px);
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--paper-shadow), transparent);
}

.depth-label::before {
    left: 0;
}

.depth-label::after {
    right: 0;
}

.depth-label span {
    background: var(--paper);
    padding: 0 1rem;
    font-size: 0.85rem;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 300;
    color: var(--ink-light);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.parent-groups {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
}

.parent-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.parent-label {
    font-size: 0.9rem;
    color: var(--ink-light);
    font-style: italic;
    margin-bottom: 0.5rem;
    font-weight: 400;
    letter-spacing: 0.05em;
}

.children-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.8rem;
    position: relative;
}

.parent-group::before {
    content: '';
    position: absolute;
    top: -1.5rem;
    left: 50%;
    width: 1px;
    height: 1.5rem;
    background: var(--wire-color);
    opacity: 0.5;
}

.depth-1 .node {
    font-size: 1.15rem;
    font-weight: 500;
}

.depth-2 .node {
    font-size: 1.05rem;
    font-weight: 400;
    border-color: var(--ink-light);
}

.depth-3 .node {
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--ink-medium);
    border-color: var(--ink-faint);
}

.assoc-type {
    display: block;
    font-size: 0.75rem;
    color: var(--ink-faint);
    font-family: 'JetBrains Mono', monospace;
    margin-top: 0.15rem;
    text-transform: lowercase;
}

/* ==================== SEARCH MODE LABEL ==================== */

.search-mode-label {
    text-align: center;
    margin-bottom: 1.5rem;
    padding: 0.8rem;
    background: var(--paper-dark);
    border-radius: 4px;
}

.search-mode-label .terms {
    font-weight: 600;
    color: var(--ink-dark);
}

.search-mode-label .mode {
    font-size: 0.95rem;
    color: var(--ink-light);
    font-style: italic;
    display: block;
    margin-top: 0.3rem;
}

/* ==================== FORMS ==================== */

.drop-form,
.auth-form {
    max-width: 550px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-size: 1rem;
    font-weight: 500;
    color: var(--ink-medium);
    margin-bottom: 0.5rem;
    letter-spacing: 0.05em;
}

.form-input,
.form-textarea,
.assoc-type-select {
    width: 100%;
    padding: 0.8rem 1rem;
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 1.1rem;
    border: 1px solid var(--paper-shadow);
    border-radius: 4px;
    background: var(--node-bg);
    color: var(--ink-black);
    outline: none;
    transition: all 0.3s ease;
}

.form-input:focus,
.form-textarea:focus,
.assoc-type-select:focus {
    border-color: var(--ink-light);
}

.form-textarea {
    min-height: 80px;
    resize: vertical;
}

.form-hint {
    display: block;
    font-size: 0.75rem;
    color: var(--ink-light);
    margin-top: 0.3rem;
    font-style: italic;
}

.form-error {
    color: var(--danger);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    min-height: 1.5rem;
}

/* ==================== ASSOCIATION INPUT ==================== */

.assoc-input-row,
.link-input-row {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.assoc-input-row .form-input,
.link-input-row .form-input {
    flex: 1;
}

.link-title-input {
    max-width: 150px;
}

.assoc-type-input {
    width: 130px !important;
    flex: none !important;
    padding: 0.8rem 0.5rem;
    font-size: 0.95rem;
}

.assoc-type-input::placeholder {
    color: var(--ink-faint);
}

.add-assoc-btn {
    padding: 0.6rem 1rem;
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 0.9rem;
    border: 1px dashed var(--ink-faint);
    border-radius: 4px;
    background: transparent;
    color: var(--ink-medium);
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.add-assoc-btn:hover {
    border-color: var(--ink-medium);
    color: var(--ink-dark);
}

/* ==================== TAGS ==================== */

.tags-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
    min-height: 30px;
}

.tag {
    display: inline-flex;
    align-items: center;
    background: var(--paper);
    border: 1px solid var(--ink-faint);
    border-radius: 3px;
    padding: 0.4rem 0.7rem;
    font-size: 1rem;
    color: var(--ink-dark);
}

.tag-type {
    font-size: 0.8rem;
    color: var(--ink-light);
    font-family: 'JetBrains Mono', monospace;
    margin-left: 0.4rem;
    text-transform: lowercase;
}

.tag-remove {
    margin-left: 0.5rem;
    cursor: pointer;
    color: var(--ink-light);
    font-weight: 300;
    font-size: 1.1rem;
    line-height: 1;
}

.tag-remove:hover {
    color: var(--danger);
}

/* ==================== BUTTONS ==================== */

.btn {
    display: inline-block;
    padding: 0.9rem 2rem;
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    border: 1px solid var(--ink-dark);
    border-radius: 4px;
    background: var(--ink-dark);
    color: var(--paper);
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn:hover:not(:disabled) {
    background: var(--ink-black);
    transform: translateY(-1px);
    box-shadow: 0 3px 15px rgba(0,0,0,0.15);
}

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

.btn-full {
    width: 100%;
}

.btn-secondary {
    background: transparent;
    color: var(--ink-dark);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--paper-dark);
}

.btn-danger {
    background: var(--danger);
    border-color: var(--danger);
}

.btn-danger:hover:not(:disabled) {
    background: var(--danger-light);
}

.form-actions {
    text-align: center;
    margin-top: 2rem;
}

/* ==================== AUTH BOX ==================== */

.auth-box {
    background: var(--node-bg);
    border: 1px solid var(--paper-shadow);
    border-radius: 8px;
    padding: 2.5rem;
    margin-top: 2rem;
}

.auth-title {
    font-size: 1.5rem;
    font-weight: 500;
    text-align: center;
    margin-bottom: 2rem;
    color: var(--ink-dark);
}

.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--paper-shadow);
    font-size: 0.95rem;
    color: var(--ink-light);
}

.auth-footer a {
    color: var(--ink-dark);
}

/* ==================== TOAST ==================== */

.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--ink-dark);
    color: var(--paper);
    padding: 1rem 2rem;
    border-radius: 4px;
    font-size: 0.95rem;
    opacity: 0;
    transition: all 0.4s ease;
    z-index: 1000;
}

.toast.visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.error {
    background: var(--danger);
}

/* ==================== MODAL ==================== */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
}

.modal.visible {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
}

.modal-content {
    position: relative;
    background: var(--node-bg);
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--paper-shadow);
}

.modal-title {
    font-size: 1.4rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--ink-light);
    cursor: pointer;
    line-height: 1;
    padding: 0;
}

.modal-close:hover {
    color: var(--ink-dark);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    padding: 1.5rem;
    border-top: 1px solid var(--paper-shadow);
}

.modal-footer .btn-danger {
    margin-right: auto;
}

/* Existing items in edit modal */
.existing-items {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.existing-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    background: var(--paper);
    border: 1px solid var(--paper-shadow);
    border-radius: 4px;
    font-size: 0.95rem;
}

.existing-item-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
    min-width: 0;
}

.existing-item-title {
    color: var(--ink-dark);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.existing-item-type {
    font-size: 0.7rem;
    color: var(--ink-light);
    font-family: 'JetBrains Mono', monospace;
    text-transform: lowercase;
    white-space: nowrap;
}

.existing-item-url {
    font-size: 0.75rem;
    color: var(--ink-light);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
}

.existing-item-remove {
    background: none;
    border: none;
    color: var(--ink-light);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0 0.25rem;
    line-height: 1;
    flex-shrink: 0;
}

.existing-item-remove:hover {
    color: var(--danger);
}

.empty-hint {
    color: var(--ink-light);
    font-style: italic;
    font-size: 0.9rem;
    padding: 0.5rem 0;
}

.tag-new {
    background: #e8f5e9;
    border-color: #a5d6a7;
}

/* Confirm delete dialog */
.confirm-delete {
    text-align: center;
    padding: 1rem 0;
}

.confirm-delete p {
    margin-bottom: 1.5rem;
    color: var(--ink-medium);
}

.confirm-delete-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

/* ==================== LINKS DISPLAY ==================== */

.thought-links {
    margin-top: 1rem;
}

.thought-links-title {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--ink-medium);
    margin-bottom: 0.5rem;
}

.thought-link {
    display: block;
    padding: 0.5rem 0;
    color: var(--ink-dark);
    text-decoration: none;
    font-size: 0.95rem;
    border-bottom: 1px solid var(--paper-dark);
    transition: color 0.2s ease;
}

.thought-link:hover {
    color: var(--ink-black);
}

.thought-link-url {
    font-size: 0.75rem;
    color: var(--ink-light);
    font-family: 'JetBrains Mono', monospace;
}

/* ==================== EMPTY STATE ==================== */

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--ink-light);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.3;
}

.empty-state p {
    font-style: italic;
    font-size: 1.1rem;
}

/* ==================== LOADING ==================== */

.loading {
    text-align: center;
    padding: 2rem;
    color: var(--ink-light);
}

.loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--paper-shadow);
    border-top-color: var(--ink-medium);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 0.5rem;
    vertical-align: middle;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ==================== RESPONSIVE ==================== */

@media (max-width: 600px) {
    body {
        padding: 1rem;
    }

    .logo {
        font-size: 1.8rem;
    }

    .node.root {
        font-size: 1.3rem;
        padding: 0.8rem 1.5rem;
    }

    .tabs {
        gap: 1.5rem;
    }

    .parent-groups {
        gap: 1.5rem;
    }
    
    .user-menu {
        position: static;
        margin-top: 1rem;
    }
    
    .assoc-input-row,
    .link-input-row {
        flex-wrap: wrap;
    }
    
    .assoc-type-select {
        width: 100%;
    }
    
    .link-title-input {
        max-width: none;
    }
    
    .modal-content {
        width: 95%;
        max-height: 90vh;
    }
    
    .modal-footer {
        flex-direction: column;
    }
    
    .modal-footer .btn {
        width: 100%;
    }
}

/* ==================== PWA STANDALONE ==================== */

@media (display-mode: standalone) {
    body {
        padding-top: env(safe-area-inset-top);
        padding-bottom: env(safe-area-inset-bottom);
    }
}