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

:root {
    --bg-primary: #1e1e1e;
    --bg-secondary: #252526;
    --bg-tertiary: #2d2d30;
    --bg-hover: #2a2d2e;
    --border-color: #3e3e42;
    --text-primary: #cccccc;
    --text-secondary: #858585;
    --accent-blue: #007acc;
    --accent-green: #4ec9b0;
    --accent-yellow: #dcdcaa;
    --accent-orange: #ce9178;
    --accent-red: #f48771;
    --success: #89d185;
    --error: #f48771;
    --warning: #cca700;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

.bitcoin-symbol {
    color: var(--accent-yellow);
    font-weight: bold;
    font-size: 1.2em;
}

/* IDE Container */
.ide-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Top Bar */
.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    height: 50px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: bold;
    font-size: 1.1em;
}

.fatcat-logo {
    height: 45px;
    width: auto;
    object-fit: contain;
    margin-right: 0.25rem;
}

.mode-toggle {
    display: flex;
    gap: 0.5rem;
}

.mode-btn {
    padding: 0.4rem 1rem;
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.9em;
    font-weight: 600;
    transition: all 0.2s;
}

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

.mode-btn.active {
    background: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

.mode-btn.active.live-mode {
    background: var(--accent-green);
    border-color: var(--accent-green);
}

.actions {
    display: flex;
    gap: 0.5rem;
}

.action-btn {
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.9em;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.action-btn:hover {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
}

/* Samples Dropdown */
.samples-dropdown {
    position: relative;
}

.samples-menu {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-top: 0.5rem;
    min-width: 300px;
    max-height: 400px;
    overflow-y: auto;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.samples-menu.active {
    display: block;
}

.sample-item {
    padding: 0.8rem 1rem;
    cursor: pointer;
    border-bottom: 1px solid var(--border-color);
    transition: background 0.2s;
}

.sample-item:hover {
    background: var(--bg-hover);
}

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

.sample-item .sample-title {
    color: var(--accent-yellow);
    font-weight: 600;
    font-size: 0.9em;
}

.sample-item .sample-filename {
    color: var(--text-secondary);
    font-size: 0.75em;
    margin-top: 0.2rem;
}

/* Syntax Validation */
#validationStatus {
    font-size: 0.85em;
}

#validationStatus.valid {
    color: var(--success);
}

#validationStatus.invalid {
    color: var(--error);
}

.validation-tooltip {
    position: absolute;
    background: var(--bg-tertiary);
    border: 1px solid var(--error);
    border-radius: 4px;
    padding: 0.5rem;
    color: var(--text-primary);
    font-size: 0.85em;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
    max-width: 300px;
}

.validation-tooltip .error-message {
    color: var(--error);
    font-weight: 600;
    margin-bottom: 0.3rem;
}

.validation-tooltip .suggestion {
    color: var(--accent-yellow);
    font-size: 0.9em;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 300px 1fr 350px;
    gap: 1px;
    background: var(--border-color);
    flex: 1;
    overflow: hidden;
    transition: grid-template-columns 0.3s ease;
}

.main-content.keypad-collapsed {
    grid-template-columns: 50px 1fr 350px;
}

.panel {
    background: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    padding: 0.6rem 1rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 0.9em;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.collapse-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1em;
    transition: all 0.2s;
}

.collapse-btn:hover {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
}

.keypad-panel.collapsed #keypadContent,
.keypad-panel.collapsed .keypad-help {
    display: none;
}

.keypad-panel.collapsed .panel-header {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    justify-content: center;
}

.keypad-panel.collapsed .collapse-btn {
    writing-mode: horizontal-tb;
    transform: rotate(0);
}

.keypad-panel.collapsed {
    transition: all 0.3s ease;
}

.file-name {
    color: var(--accent-yellow);
    font-weight: normal;
    font-size: 0.85em;
}

/* Keypad Panel */
.keypad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    padding: 1rem;
}

.key-btn {
    aspect-ratio: 1;
    border: 2px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-size: 1.5em;
    font-weight: bold;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.15s;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.key-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent-blue);
    transform: translateY(-2px);
}

.key-btn:active {
    transform: translateY(0);
    background: var(--accent-blue);
}

.key-btn.digit {
    color: var(--accent-yellow);
}

.key-btn.command {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

.key-btn.command:hover {
    background: #005a9e;
}

.key-primary {
    font-size: 1.2em;
    font-weight: bold;
}

.key-secondary {
    font-size: 0.5em;
    font-weight: normal;
    color: rgba(255, 255, 255, 0.8);
    margin-left: 2px;
}

.key-hint {
    font-size: 0.4em;
    font-weight: normal;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 2px;
}

.keypad-help {
    padding: 1rem;
    font-size: 0.85em;
    overflow-y: auto;
}

.keypad-help h4 {
    color: var(--accent-green);
    margin-bottom: 0.5rem;
}

.keypad-help ul {
    list-style: none;
}

.keypad-help li {
    padding: 0.3rem 0;
    border-bottom: 1px solid var(--border-color);
}

.keypad-help strong {
    color: var(--accent-yellow);
}

/* Script Editor */
.editor-panel {
    position: relative;
}

.script-editor {
    flex: 1;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: none;
    padding: 1rem;
    font-family: 'Courier New', monospace;
    font-size: 1.1em;
    resize: none;
    outline: none;
    line-height: 1.6;
}

.editor-status {
    padding: 0.4rem 1rem;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    font-size: 0.85em;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
}

/* VM State Panel */
.state-display {
    padding: 1rem;
    overflow-y: auto;
}

.state-section {
    margin-bottom: 1.5rem;
}

.state-section h4 {
    color: var(--accent-green);
    margin-bottom: 0.6rem;
    font-size: 0.9em;
}

.stack-size {
    color: var(--text-secondary);
    font-weight: normal;
    font-size: 0.85em;
}

.state-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.state-item .label {
    color: var(--text-secondary);
    font-size: 0.9em;
}

.state-item .value {
    color: var(--accent-yellow);
    font-weight: 600;
}

.stack-display {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.8rem;
    min-height: 100px;
    font-family: 'Courier New', monospace;
}

.stack-item {
    padding: 0.4rem 0.6rem;
    margin: 0.3rem 0;
    background: var(--bg-tertiary);
    border-left: 3px solid var(--accent-yellow);
    border-radius: 2px;
}

.stack-item.top {
    border-left-color: var(--accent-green);
    font-weight: bold;
}

.stack-item .value {
    color: var(--accent-yellow);
}

.stack-item .label {
    color: var(--text-secondary);
    font-size: 0.8em;
    margin-left: 0.5rem;
}

.empty-stack {
    color: var(--text-secondary);
    font-style: italic;
    text-align: center;
    padding: 2rem 0;
}

.buffer-display {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.8rem;
    font-family: 'Courier New', monospace;
    font-size: 1.1em;
    min-height: 50px;
}

.buffer-display .buffer-value {
    color: var(--accent-yellow);
    font-weight: bold;
}

.empty-buffer {
    color: var(--text-secondary);
    font-style: italic;
}

.sequence-display {
    background: var(--bg-primary);
    border: 1px solid var(--accent-blue);
    border-radius: 4px;
    padding: 0.6rem;
    color: var(--accent-blue);
    font-family: 'Courier New', monospace;
}

/* Console Panel */
.console-panel {
    height: 200px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.console-output {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.console-welcome {
    color: var(--accent-green);
    padding: 1rem 0;
}

.console-entry {
    padding: 0.3rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.console-entry.success {
    color: var(--success);
}

.console-entry.error {
    color: var(--error);
}

.console-entry.warning {
    color: var(--warning);
}

.console-entry.info {
    color: var(--accent-blue);
}

.clear-btn {
    padding: 0.2rem 0.6rem;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 3px;
    font-size: 0.8em;
}

.clear-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

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

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    width: 90%;
    max-width: 500px;
}

.modal-content h3 {
    color: var(--accent-green);
    margin-bottom: 1rem;
}

.modal-content input {
    width: 100%;
    padding: 0.8rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 4px;
    font-size: 1em;
    margin-bottom: 1rem;
}

.modal-buttons {
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
}

.btn-primary, .btn-secondary {
    padding: 0.6rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 600;
}

.btn-primary {
    background: var(--accent-blue);
    color: white;
}

.btn-primary:hover {
    background: #005a9e;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

/* Donation Modal */
.donation-modal {
    max-width: 600px;
    text-align: center;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 30px;
    height: 30px;
    transition: color 0.2s;
}

.modal-close:hover {
    color: var(--accent-red);
}

.donation-header {
    margin-bottom: 1.5rem;
}

.fatcat-avatar {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: 3px solid var(--accent-yellow);
    margin-bottom: 1rem;
    object-fit: cover;
}

.donation-header h2 {
    color: var(--accent-yellow);
    margin: 0;
    font-size: 1.8rem;
}

.donation-body p {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.bitcoin-address-display {
    background: var(--bg-primary);
    border: 2px solid var(--accent-blue);
    border-radius: 8px;
    padding: 1rem;
    margin: 1.5rem 0;
}

.bitcoin-address-display code {
    color: var(--accent-green);
    font-size: 0.9rem;
    word-break: break-all;
    font-family: 'Courier New', monospace;
}

.copy-btn {
    width: 100%;
    padding: 0.8rem;
    font-size: 1rem;
    margin-bottom: 1rem;
}

.donation-footer {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 1rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.footer a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: color 0.2s;
}

.footer a:hover {
    color: var(--accent-green);
    text-decoration: underline;
}

.footer .separator {
    color: var(--border-color);
}

/* Responsive */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 250px 1fr 300px;
    }
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr auto;
    }
    
    .keypad-panel, .state-panel {
        max-height: 300px;
    }
}