:root {
    --dp-00: #121212;
    --dp-01: #1e1e1e;
    --dp-02: #222222;
    --dp-03: #252525;
    --dp-04: #272727;
    --dp-06: #2c2c2c;
    --dp-08: #2d2d2d;
    --dp-12: #333333;
    --dp-16: #353535;
    --dp-24: #383838;

    --text-high: rgba(255, 255, 255, 0.87);
    --text-medium: rgba(255, 255, 255, 0.60);
    --text-disabled: rgba(255, 255, 255, 0.38);

    --border-divider: rgba(255, 255, 255, 0.12);

    --bg-body: var(--dp-00);
    --bg-container: var(--dp-01);
    --bg-input: var(--dp-04);
    --bg-button: var(--dp-08);
    --bg-button-hover: var(--dp-12);
    --bg-scrollbar-thumb: var(--dp-12);
    --bg-scrollbar-hover: var(--dp-16);

    --text-main: var(--text-high);
    --text-label: var(--text-medium);
    --text-placeholder: var(--text-disabled);

    --border-main: var(--border-divider);
    --border-focus: var(--text-medium);

    --shadow-container: rgba(0, 0, 0, 0.5);
    --shadow-focus: rgba(255, 255, 255, 0.12);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    padding: 2rem;
    background: var(--bg-body);
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 0;
    min-height: 100vh;
}

.container {
    background: var(--bg-container);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 8px 8px var(--shadow-container);
    width: 100%;
    max-width: 500px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h2 {
    margin-top: 0;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: var(--text-high);
}

textarea,
input,
select {
    width: 100%;
    box-sizing: border-box;
    padding: 0.75rem;
    margin-top: 1rem;
    font-size: 1rem;
    background: var(--bg-input);
    border: 1px solid var(--border-main);
    color: var(--text-main);
    border-radius: 8px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

textarea::placeholder,
input::placeholder {
    color: var(--text-placeholder);
}

textarea:focus,
input:focus,
select:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 2px var(--shadow-focus);
}

textarea {
    resize: vertical;
}

button {
    padding: 0.6rem 1.2rem;
    margin-top: 1rem;
    cursor: pointer;
    background: var(--bg-button);
    color: var(--text-main);
    border: 1px solid var(--border-main);
    border-radius: 50px;
    transition: background 0.2s ease, transform 0.1s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 500;
}

button:hover {
    background: var(--bg-button-hover);
    transform: translateY(-1px);
}

button:active {
    transform: translateY(1px);
}

.output-actions {
    display: flex;
    width: 100%;
    justify-content: flex-end;
    margin-top: -0.5rem;
}

.output-actions button {
    margin-top: 0.5rem;
    padding: 0.6rem;
    border-radius: 50%;
    width: 40px;
    height: 40px;
}

#historySection {
    width: 100%;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-main);
}

label {
    color: var(--text-label);
    font-size: 0.95rem;
}

.history-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
    justify-content: space-between;
}

.history-buttons button {
    margin-top: 0;
    flex: 1 1 auto;
    font-size: 0.85rem;
    padding: 0.5rem 1rem;
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-container);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-scrollbar-thumb);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--bg-scrollbar-hover);
}