:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --background-color: #f0f4f8;
    --card-background: #ffffff;
    --text-color: #1e293b;
    --subtle-text: #64748b;
    --border-color: #cbd5e1;
    --success-color: #16a34a;
    --error-color: #dc2626;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    box-sizing: border-box;
}

#app {
    width: 100%;
    max-width: 500px;
    background: var(--card-background);
    padding: 2rem 2.5rem;
    border-radius: 16px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    text-align: center;
}

header {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo {
    width: 40px;
    height: 40px;
}

h1 {
    font-size: 1.75rem;
    color: var(--text-color);
    margin: 0;
}

h2 {
    font-size: 1.5rem;
    color: var(--error-color);
}

.subtitle {
    color: var(--subtle-text);
    margin: 0 0 2rem 0;
}

.input-container {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

#long-url-input {
    flex-grow: 1;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    font-size: 1rem;
    transition: box-shadow 0.2s;
}

#long-url-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

#shorten-btn {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background-color: var(--primary-color);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s;
}

#shorten-btn:hover {
    background-color: var(--primary-hover);
}

#result {
    margin-top: 1.5rem;
    padding: 1rem;
    background-color: #f8fafc;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    text-align: left;
}

#result p {
    margin: 0 0 0.5rem 0;
    font-weight: 500;
    color: var(--subtle-text);
    font-size: 0.9rem;
}

.result-box {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#short-url-link {
    flex-grow: 1;
    font-family: "Courier New", Courier, monospace;
    color: var(--primary-color);
    text-decoration: none;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 1.1rem;
}

#short-url-link:hover {
    text-decoration: underline;
}

#copy-btn {
    background-color: #e2e8f0;
    border: none;
    border-radius: 6px;
    padding: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

#copy-btn:hover {
    background-color: #cbd5e1;
}

#copy-btn.copied {
    background-color: var(--success-color);
}

#copy-btn img {
    width: 20px;
    height: 20px;
}

.error-text {
    color: var(--error-color);
    margin-top: 1rem;
}

.hidden {
    display: none;
}

#redirect-view, #not-found-view {
    padding: 2rem 0;
}

#redirect-message {
    font-size: 1.2rem;
    color: var(--subtle-text);
}