/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Accent (teal, matching landing) */
    --primary-color: #6bd4c8;
    --primary-hover: #5cc4b8;
    --accent-glow: rgba(107, 212, 200, 0.2);

    /* Backgrounds */
    --bg-color: #1a1a26;
    --panel-bg: #1f1f2e;
    --bg-tertiary: #252536;

    /* Text */
    --text-color: #e8e8ec;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.45);

    /* Borders */
    --border-color: rgba(255, 255, 255, 0.08);
    --border-light: rgba(255, 255, 255, 0.12);

    /* Accent alias */
    --accent-color: #6bd4c8;
    --danger-color: #ef4444;

    /* Photon gradient */
    --photon-gradient: linear-gradient(45deg, #9dc66b 0%, #6bd4c8 33%, #4fa49a 66%, #4361c2 100%);
}

body {
    font-family: 'Source Sans Pro', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    font-weight: 300;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
}

.header-logo {
    font-size: 1.25rem;
    font-weight: 300;
    color: var(--text-color);
    text-decoration: none;
    letter-spacing: 0;
    transition: opacity 0.2s;
}

.header-logo:hover {
    opacity: 0.8;
}

.logo-lamella {
    font-weight: 300;
}

.logo-studio {
    font-weight: 600;
}

.header-actions {
    display: flex;
    gap: 10px;
    align-items: center;
}

/* Buttons */
.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
    background: var(--border-color);
    color: var(--text-color);
}

.btn:hover {
    background: rgba(255, 255, 255, 0.12);
}

.btn-primary {
    background: var(--primary-color);
    color: #1a1a26;
    font-weight: 500;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: 50%;
    font-weight: bold;
}

.btn-small {
    padding: 4px 10px;
    font-size: 12px;
}

.btn-small.active {
    background: var(--primary-color);
}

.btn-block {
    width: 100%;
    margin-top: 15px;
}

/* Dropdown */
.dropdown {
    position: relative;
}

.dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    margin-top: 5px;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    min-width: 180px;
    z-index: 100;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.dropdown-content a {
    display: block;
    padding: 10px 15px;
    color: var(--text-color);
    text-decoration: none;
    transition: background 0.2s;
}

.dropdown-content a:hover {
    background: rgba(255,255,255,0.1);
}

.dropdown:hover .dropdown-content {
    display: block;
}

/* Main content */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Parameters panel */
.params-panel {
    width: 280px;
    background: var(--panel-bg);
    border-right: 1px solid var(--border-color);
    padding: 15px;
    overflow-y: auto;
}

.params-section {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.params-section h3 {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

/* Unit selector in section headers */
.unit-select {
    padding: 1px 4px;
    font-size: 10px;
    font-family: inherit;
    background: var(--bg-color);
    color: var(--accent-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    text-transform: none;
    letter-spacing: 0;
}

.unit-select:focus {
    outline: none;
    border-color: var(--accent-color);
}

.param-group {
    margin-bottom: 12px;
}

.param-group label {
    display: block;
    font-size: 13px;
    margin-bottom: 5px;
    color: var(--text-muted);
}

.param-group input[type="number"]:not(.param-value-input),
.param-group select {
    width: 100%;
    padding: 8px 10px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-color);
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.2s;
}

.param-group input[type="number"]:focus,
.param-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.param-group input[type="range"] {
    width: calc(100% - 65px);
    vertical-align: middle;
}

/* Editable number input next to slider */
.param-value-input {
    width: 58px;
    padding: 2px 4px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--accent-color);
    font-size: 13px;
    font-family: inherit;
    text-align: right;
    vertical-align: middle;
    transition: border-color 0.2s;
    -moz-appearance: textfield;
}

.param-value-input::-webkit-outer-spin-button,
.param-value-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.param-group input[type="file"] {
    width: 100%;
    padding: 8px;
    background: var(--bg-color);
    border: 1px dashed var(--border-color);
    border-radius: 4px;
    color: var(--text-muted);
    font-size: 12px;
    cursor: pointer;
}

.heightmap-preview {
    margin-top: 10px;
    display: none;
}

.heightmap-preview img {
    width: 100%;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

/* Preview area */
.preview-area {
    flex: 1;
    position: relative;
    display: flex;
    flex-direction: column;
}

.three-container {
    flex: 1;
    position: relative;
}

.three-container canvas {
    display: block;
}

/* Loading spinner */
.loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    color: var(--text-muted);
}

.loading.active {
    display: flex;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Stats panel */
.stats-panel {
    display: flex;
    gap: 20px;
    padding: 12px 20px;
    background: var(--panel-bg);
    border-top: 1px solid var(--border-color);
}

.stat-item {
    display: flex;
    gap: 8px;
}

.stat-label {
    color: var(--text-muted);
    font-size: 13px;
}

.stat-value {
    color: var(--accent-color);
    font-weight: 600;
    font-size: 13px;
}

/* View controls */
.view-controls {
    position: absolute;
    top: 15px;
    right: 15px;
    display: flex;
    gap: 8px;
    align-items: center;
    background: rgba(31, 31, 46, 0.9);
    padding: 8px 12px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 12px;
    color: var(--text-muted);
    cursor: pointer;
    margin-left: 10px;
}

.toggle-label input {
    cursor: pointer;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--panel-bg);
    padding: 30px;
    border-radius: 10px;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.modal-content h2 {
    margin-bottom: 20px;
}

.modal-content h3 {
    margin: 15px 0 10px;
    color: var(--accent-color);
}

.modal-content ul {
    margin-left: 20px;
}

.modal-content li {
    margin-bottom: 8px;
    line-height: 1.5;
}

.close {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-muted);
}

.close:hover {
    color: var(--text-color);
}

/* Preset params */
#presetParams .param-group {
    margin-top: 10px;
}

/* Node Editor */
.node-editor-section {
    background: rgba(107, 212, 200, 0.06);
    border: 1px solid rgba(107, 212, 200, 0.25);
    border-radius: 6px;
    padding: 12px;
    margin-top: 10px;
}

.node-editor-section h3 {
    color: var(--accent-color);
}

.edit-mode-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    background: var(--bg-color);
    border-radius: 6px;
    cursor: pointer;
    margin-left: 0;
}

.edit-mode-toggle input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent-color);
}

.edit-mode-toggle span {
    font-weight: 500;
    color: var(--text-color);
}

.node-editor-controls {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.node-editor-controls .param-group {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.node-editor-controls .param-group label {
    width: 60px;
    margin-bottom: 0;
}

.node-editor-controls .param-group input[type="number"] {
    flex: 1;
}

.node-editor-controls .btn {
    margin-top: 8px;
    margin-right: 8px;
}

.node-editor-controls .hint {
    margin-top: 12px;
    font-size: 11px;
    color: var(--text-muted);
    font-style: italic;
    line-height: 1.4;
}

.height-display {
    display: flex;
    align-items: baseline;
    gap: 8px;
    padding: 10px 12px;
    background: var(--bg-color);
    border-radius: 6px;
    margin-bottom: 12px;
}

.height-label {
    font-size: 12px;
    color: var(--text-muted);
}

.height-value {
    font-size: 24px;
    font-weight: 700;
    color: #ff00ff;
    font-family: 'Monaco', 'Consolas', monospace;
}

.height-unit {
    font-size: 12px;
    color: var(--text-muted);
}

/* Edit mode active indicator */
.three-container.edit-mode {
    cursor: crosshair;
}

.three-container.edit-mode::after {
    content: 'EDIT MODE';
    position: absolute;
    top: 15px;
    left: 15px;
    padding: 6px 12px;
    background: var(--accent-color);
    color: white;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1px;
    border-radius: 4px;
    pointer-events: none;
}

/* ── Auth section ── */
.auth-section {
    display: flex;
    align-items: center;
}

.btn-google {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-color);
    border: 1px solid var(--border-light);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 12px;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s;
}
.btn-google:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--accent-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    cursor: pointer;
}

.user-avatar {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
}

.user-dropdown {
    left: 0;
    right: auto;
    min-width: 200px;
}

.user-dropdown-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 15px;
    border-bottom: 1px solid var(--border-color);
}

.user-dropdown-email {
    font-size: 11px;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 120px;
}

.tier-badge {
    padding: 2px 7px;
    border-radius: 4px;
    font-size: 9px;
    font-weight: 700;
    letter-spacing: 0.5px;
}
.tier-free   { background: rgba(255, 255, 255, 0.08); color: var(--text-muted); }
.tier-pro    { background: #f59e0b; color: #000; }
.tier-studio { background: var(--accent-color); color: #1a1a26; }

/* ── Feature locking ── */
.feature-locked {
    position: relative;
    opacity: 0.45;
}
.feature-locked > * {
    pointer-events: none;
}
.feature-locked::after {
    content: attr(data-lock-label);
    position: absolute;
    top: 50%;
    right: 8px;
    transform: translateY(-50%);
    padding: 1px 6px;
    background: var(--primary-color);
    color: #fff;
    font-size: 9px;
    font-weight: 700;
    letter-spacing: 0.5px;
    border-radius: 3px;
    pointer-events: none;
    z-index: 1;
}

/* ── Upgrade modal ── */
.upgrade-modal {
    text-align: center;
}
.upgrade-modal h2 {
    margin-bottom: 12px;
}
.upgrade-modal p {
    margin-bottom: 8px;
    color: var(--text-muted);
}
.upgrade-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 18px;
}

/* Range input styling */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 2px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    border: none;
}

/* Scrollbar styling */
.params-panel::-webkit-scrollbar {
    width: 4px;
}
.params-panel::-webkit-scrollbar-track {
    background: transparent;
}
.params-panel::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
}

/* Responsive */
@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }

    .params-panel {
        width: 100%;
        max-height: 40vh;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .stats-panel {
        flex-wrap: wrap;
        gap: 10px;
    }
}