* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: #f6f7fb;
    min-height: 100vh;
    width: 100vw;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.account {
    width: 440px;
    min-width: 260px;
    background: #fff;
    padding: 2rem 2rem 1.5rem 2rem;
    border-radius: 18px;
    color: #23272f;
    border: 1px solid #e5e7eb;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 1.1rem;
    margin-top: 2.5rem;
}

.account label {
    font-size: 1.08rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #23272f;
    letter-spacing: 0.1px;
}

#user {
    background: #f6f7fb;
    color: #23272f;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 1rem 1.2rem;
    font-size: 1.08rem;
    outline: none;
    font-weight: 500;
    letter-spacing: 0.1px;
    margin-bottom: 1rem;
}

#user:focus {
    border: 1.5px solid #6366f1;
    background: #f0f1fa;
}

.account button {
    width: 100%;
    height: 2.5rem;
    border-radius: 8px;
    background: #23272f;
    color: #fff;
    font-weight: 600;
    font-size: 1.08rem;
    border: none;
    cursor: pointer;
    letter-spacing: 0.2px;
}
.account button:hover, .account button:focus {
    background: #6366f1;
    color: #fff;
}

.user {
    background: #fff;
    width: 440px;
    min-width: 260px;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 3.8rem;
    border-radius: 14px;
    border: 1px solid #e5e7eb;
    margin-bottom: 1.1rem;
}

.profile {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 22px;
    width: 100%;
    height: 100%;
}

.image {
    width: 2.7rem;
    height: 2.7rem;
    background: #f6f7fb;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1.5px solid #e5e7eb;
}

.username {
    color: #6366f1;
    font-size: 1.08rem;
    font-weight: 600;
    letter-spacing: 0.1px;
}

.username h2 {
    color: #23272f;
    font-size: 1.13rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: 0.1px;
}

.stat {
    background: #fff;
    width: 440px;
    min-width: 260px;
    border-radius: 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 10.5rem;
    border: 1px solid #e5e7eb;
    padding: 1rem 1rem;
    gap: 1rem;
    margin-bottom: 1.2rem;
}

.acceptance {
    height: 100%;
    width: 44%;
    background: #f6f7fb;
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 1px solid #e5e7eb;
    position: relative;
    overflow: hidden;
}
.acceptance h4 {
    color: #6366f1;
    padding-top: 5px;
    font-size: 1.01rem;
    font-weight: 600;
    letter-spacing: 0.1px;
    z-index: 1;
    position: relative;
}

.acceptance h1 {
    margin-top: 1rem;
    font-size: 2rem;
    color: #23272f;
    font-weight: 800;
    letter-spacing: 0.5px;
    z-index: 1;
    position: relative;
}

.stat2 {
    width: 56%;
    height: 100%;
    display: flex;
    align-items: stretch;
    justify-content: center;
    flex-direction: column;
    gap: 0.7rem;
}

.points, .reputation, .ranking {
    width: 100%;
    height: 32%;
    background: #f6f7fb;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 1px solid #e5e7eb;
    padding: 0.4rem 0;
    position: relative;
    overflow: hidden;
}

.points h6, .reputation h6, .ranking h6 {
    color: #23272f;
    padding-top: 2px;
    font-size: 0.98rem;
    font-weight: 600;
    z-index: 1;
    position: relative;
}
.points h2, .reputation h2, .ranking h2 {
    color: #6366f1;
    font-size: 1.13rem;
    font-weight: 800;
    z-index: 1;
    position: relative;
}

.charts {
    width: 440px;
    min-width: 260px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin: 1.5rem auto 1.5rem auto;
}

.pie-chart-container {
    background: #fff;
    border-radius: 10px;
    border: 1px solid #e5e7eb;
    padding: 1.2rem 0.7rem 0.7rem 0.7rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.pie-chart-wrapper {
    position: relative;
    width: 220px;
    height: 220px;
    margin: 0 auto;
}
#pieChart {
    display: block;
    background: #fff;
    border-radius: 50%;
}
#pie-center-text {
    position: absolute;
    top: 0;
    left: 0;
    width: 220px;
    height: 220px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    z-index: 2;
}
#pie-center-text .main {
    font-size: 2.3rem;
    font-weight: 800;
    color: #23272f;
    line-height: 1;
}
#pie-center-text .sub {
    font-size: 1.1rem;
    color: #6366f1;
    font-weight: 600;
    margin-top: 0.1em;
}
#pie-center-text .label {
    font-size: 1rem;
    color: #22c55e;
    margin-top: 0.2em;
    font-weight: 600;
}

.pie-legend {
    display: flex;
    gap: 1.2rem;
    margin-top: 0.7rem;
    font-size: 0.98rem;
    color: #23272f;
    font-weight: 500;
}
.pie-legend .legend-dot {
    display: inline-block;
    width: 0.9em;
    height: 0.9em;
    border-radius: 50%;
    margin-right: 0.4em;
    vertical-align: middle;
}
.pie-legend .easy { background: #22c55e; }
.pie-legend .medium { background: #facc15; }
.pie-legend .hard { background: #ef4444; }
.pie-legend .unsolved { background: #e5e7eb; border: 1px solid #cbd5e1; }

.submission {
    width: 100%;
    background: #fff;
    border-radius: 10px;
    border: 1px solid #e5e7eb;
    padding: 1rem 0.7rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.problems {
    width: 440px;
    min-width: 260px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: stretch;
    gap: 0.8rem;
    margin: 1.5rem auto 1.1rem auto;
}

.problem-card {
    flex: 1;
    background: #f6f7fb;
    border-radius: 8px;
    border: 1px solid #e5e7eb;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.7rem 0.3rem;
    min-width: 0;
    position: relative;
    overflow: hidden;
}
.problem-card h5 {
    font-size: 0.98rem;
    color: #6366f1;
    margin-bottom: 0.4rem;
    font-weight: 700;
    letter-spacing: 0.1px;
}
.problem-card .easy-solved { color: #22c55e; }
.problem-card .medium-solved { color: #facc15; }
.problem-card .hard-solved { color: #ef4444; }
.problem-card .total-solved { color: #23272f; }
.problem-card .easy-total, .problem-card .medium-total, .problem-card .hard-total, .problem-card .total-questions {
    font-size: 0.98rem;
    color: #6366f1;
    font-weight: 600;
}

@media (max-width: 900px) {
    .problems {
        flex-direction: row;
        gap: 0.7rem;
        margin: 1rem auto;
    }
    .problem-card {
        width: 100%;
        min-width: 0;
        border-radius: 8px;
        padding: 0.7rem 0.3rem;
    }
}

@media (max-width: 700px) {
    .account, .user, .stat, .charts, .problems, .submission {
        width: 97vw;
        min-width: unset;
        max-width: 100vw;
        border-radius: 10px;
    }
    .account {
        margin-top: 1.2rem;
        padding: 1.2rem 0.7rem 1rem 0.7rem;
    }
    .user {
        height: auto;
        padding: 1.1rem 0;
        margin-bottom: 1.2rem;
    }
    .profile {
        flex-direction: column;
        gap: 0.7rem;
    }
    .image {
        width: 3rem;
        height: 3rem;
    }
    .username h2 {
        font-size: 1rem;
        text-align: center;
    }
    .stat {
        flex-direction: column;
        height: auto;
        padding: 1rem 0.5rem;
        gap: 0.7rem;
    }
    .acceptance, .stat2 {
        width: 98%;
        margin: 0 auto;
    }
    .acceptance {
        margin-bottom: 1rem;
        min-height: 4.5rem;
    }
    .acceptance h1 {
        font-size: 1.2rem;
        margin-top: 0.7rem;
    }
    .stat2 {
        display: flex !important;
        flex-direction: row !important;
        gap: 0.5rem;
        width: 100%;
        align-items: stretch;
        justify-content: center;
    }
    .points, .reputation, .ranking {
        width: 33.3%;
        margin: 0;
        height: auto;
        padding: 0.7rem 0.2rem;
        border-radius: 8px;
    }
    .charts {
        flex-direction: column;
        gap: 1rem;
        margin: 1rem auto;
    }
    .pie-chart-container {
        padding: 1rem 0.3rem 0.3rem 0.3rem;
    }
    .submission {
        margin: 1rem auto;
        padding: 0.7rem 0.3rem;
    }
}