:root {
    --bg: #f3f5f7;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #5f6b7a;
    --primary: #0f766e;
    --primary-strong: #0b5d57;
    --border: #d8dee6;
    --danger: #b42318;
    --shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(180deg, #ecf7f4 0%, var(--bg) 35%, #eef2f7 100%);
    color: var(--text);
}

.app {
    max-width: 1120px;
    margin: 0 auto;
    padding: 24px 16px 40px;
}

.hero {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 18px 20px;
    box-shadow: var(--shadow);
    margin-bottom: 12px;
}

h1 {
    margin: 0;
    color: var(--primary);
    font-size: clamp(1.6rem, 2vw, 2rem);
}

.hero-subtitle {
    margin: 10px 0 0;
    color: var(--muted);
    max-width: 72ch;
}

.status-message {
    margin: 0 0 16px;
    min-height: 24px;
    padding: 2px 4px;
    color: var(--primary-strong);
    font-weight: 600;
}

.sections-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.skill-section {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 14px;
    box-shadow: var(--shadow);
}

.skill-form {
    display: grid;
    gap: 10px;
    margin-bottom: 14px;
}

h2 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--primary);
}

label {
    font-size: 0.9rem;
    color: var(--muted);
    display: grid;
    gap: 6px;
}

input[type="text"] {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 9px 10px;
    font-size: 0.95rem;
}

input[type="text"]:focus,
input[type="range"]:focus,
button:focus {
    outline: 2px solid rgba(15, 118, 110, 0.25);
    outline-offset: 1px;
}

.level-label {
    grid-template-columns: 1fr auto;
    align-items: center;
}

input[type="range"] {
    grid-column: 1 / 2;
    width: 100%;
    accent-color: var(--primary);
    cursor: pointer;
}

.range-value {
    grid-column: 2 / 3;
    min-width: 44px;
    text-align: right;
    font-weight: 700;
    color: var(--primary);
}

button {
    border: none;
    border-radius: 10px;
    padding: 10px 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

button:hover {
    background: var(--primary-strong);
}

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

button:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}

ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 8px;
}

.skill-item {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 8px 10px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
    background: #fcfefe;
}

.skill-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.skill-label {
    font-weight: 600;
}

.skill-pct {
    min-width: 44px;
    font-weight: 700;
    color: var(--primary);
}

.skill-progress {
    width: 100%;
    height: 10px;
    border: none;
    border-radius: 999px;
    overflow: hidden;
    background: #e6edf2;
}

.skill-progress::-webkit-progress-bar {
    background: #e6edf2;
    border-radius: 999px;
}

.skill-progress::-webkit-progress-value {
    background: linear-gradient(90deg, #138e83, #0f766e);
    border-radius: 999px;
}

.skill-progress::-moz-progress-bar {
    background: linear-gradient(90deg, #138e83, #0f766e);
    border-radius: 999px;
}

.delete-btn {
    background: transparent;
    color: var(--danger);
    border: 1px solid #f3c4c2;
    border-radius: 8px;
    padding: 5px 9px;
    margin-left: auto;
    font-weight: 700;
}

.delete-btn:hover {
    background: #fff1f0;
    color: #8f1b13;
}

.empty-state {
    color: var(--muted);
    font-size: 0.92rem;
    border: 1px dashed var(--border);
    border-radius: 10px;
    padding: 10px;
    background: #fafcfd;
}

@media (max-width: 1024px) {
    .sections-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 700px) {
    .app {
        padding: 16px 12px 30px;
    }

    .sections-grid {
        grid-template-columns: 1fr;
    }

    .skill-row {
        flex-wrap: wrap;
    }

    .delete-btn {
        margin-left: 0;
    }
}